Pub Date : 2025-04-02DOI: 10.1016/j.jallcom.2025.180199
Kleanny Gama Sales de Souza , Karen Pantleon , Flemming Bjerg Grumsen , Rubens Caram , Matteo Villa
Ti-Nb-Zr alloys are promising materials for structural applications in the biomedical sector. Unfortunately, detailed understanding of the solid-state transformations occurring in these alloys is lacking, in particular concerning the diffusionless processes linked to the formation of ω phase. In this work we applied simultaneous in-situ synchrotron diffraction and dilatometry to study phase transformations in three Ti-Nb-Zr alloys containing 20, 27 and 35 wt% Nb, respectively, and fixed 13 wt% Zr. The applied thermal cycle consisted in heating to 850 °C followed by cooling to room temperature, applying a high heating and cooling rate of 30 °C/s to suppress diffusional phenomena. The investigation showed no transformation in the alloy richer in Nb, which is classified as β alloy, and the occurrence of three phenomena in the other two alloys: i) the reversion of α'' martensite to β phase on heating, followed by the β→α'' martensitic transformation on cooling; ii) the ω to β transformation on heating, followed by ω formation on cooling; iii) an anomalous expansion of the β lattice on heating, followed by an anomalous contraction on cooling that is also interpreted in terms of ω↔β transformation. Finally, it is shown that all these transformations can be followed by dilatometry, paving the way to systematic investigation of transformations in similar alloys in the future.
{"title":"In-situ investigation of phase transformations in Ti-Nb-Zr alloys by simultaneous synchrotron diffraction and dilatometry","authors":"Kleanny Gama Sales de Souza , Karen Pantleon , Flemming Bjerg Grumsen , Rubens Caram , Matteo Villa","doi":"10.1016/j.jallcom.2025.180199","DOIUrl":"10.1016/j.jallcom.2025.180199","url":null,"abstract":"<div><div>Ti-Nb-Zr alloys are promising materials for structural applications in the biomedical sector. Unfortunately, detailed understanding of the solid-state transformations occurring in these alloys is lacking, in particular concerning the diffusionless processes linked to the formation of ω phase. In this work we applied simultaneous <em>in-situ</em> synchrotron diffraction and dilatometry to study phase transformations in three Ti-Nb-Zr alloys containing 20, 27 and 35 wt% Nb, respectively, and fixed 13 wt% Zr. The applied thermal cycle consisted in heating to 850 °C followed by cooling to room temperature, applying a high heating and cooling rate of 30 °C/s to suppress diffusional phenomena. The investigation showed no transformation in the alloy richer in Nb, which is classified as β alloy, and the occurrence of three phenomena in the other two alloys: i) the reversion of α'' martensite to β phase on heating, followed by the β→α'' martensitic transformation on cooling; ii) the ω to β transformation on heating, followed by ω formation on cooling; iii) an anomalous expansion of the β lattice on heating, followed by an anomalous contraction on cooling that is also interpreted in terms of ω↔β transformation. Finally, it is shown that all these transformations can be followed by dilatometry, paving the way to systematic investigation of transformations in similar alloys in the future.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1024 ","pages":"Article 180199"},"PeriodicalIF":5.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-02DOI: 10.1016/j.jallcom.2025.180001
Rui Yamada, Ninshu Ma, Hidemi Kato
The thermal imprinting of grating patterns (lines and spaces) with high aspect ratios (height-to-width ratio of the lines) on the surface of Pd42.5Cu30Ni7.5P20 metallic glass was investigated. The flow model suggested that sample’s temperature of 350 ℃ under the processing time just within the incubation time for crystallization will lead the fabrication of grating with the highest aspect ratio. The load-time curve obtained during imprinting showed that a significant decrease in the load originated from a decrease in the sample viscosity above the glass transition temperature. By minimizing the decrease in loading, a grating with a height of 37 ± 4.1 μm and a fully amorphous structure was produced. Among the metallic glass gratings for X-ray phase imaging, the grating fabricated in this study shows high aspect ratio of ~8.7. As a demonstration, the grating performance was investigated by constructing a simple diffraction apparatus, revealing that the positions of the experimentally observed diffraction spots were consistent with the calculated ones. The results suggested that it can be considered as potential for the grating of X-ray Talbot interferometer.
研究了在 Pd42.5Cu30Ni7.5P20 金属玻璃表面热压印高宽比（线条的高宽比）的光栅图案（线条和空间）。流动模型表明，样品温度为 350 ℃，加工时间刚好在结晶孵化时间内，可制造出最高纵横比的光栅。压印过程中获得的载荷-时间曲线显示，载荷的显著降低源于样品粘度在玻璃化转变温度以上的降低。通过最大限度地减小载荷，制备出了高度为 37 ± 4.1 μm、完全非晶结构的光栅。在用于 X 射线相位成像的金属玻璃光栅中，本研究中制作的光栅具有约 8.7 的高宽比。实验结果表明，实验观测到的衍射光斑位置与计算结果一致。结果表明，该光栅有可能成为 X 射线塔尔博特干涉仪的光栅。
{"title":"Grating patterns with high aspect ratios created on the surface of Pd-based metallic glass by thermal imprinting","authors":"Rui Yamada, Ninshu Ma, Hidemi Kato","doi":"10.1016/j.jallcom.2025.180001","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180001","url":null,"abstract":"The thermal imprinting of grating patterns (lines and spaces) with high aspect ratios (height-to-width ratio of the lines) on the surface of Pd42.5Cu30Ni7.5P20 metallic glass was investigated. The flow model suggested that sample’s temperature of 350 ℃ under the processing time just within the incubation time for crystallization will lead the fabrication of grating with the highest aspect ratio. The load-time curve obtained during imprinting showed that a significant decrease in the load originated from a decrease in the sample viscosity above the glass transition temperature. By minimizing the decrease in loading, a grating with a height of 37 ± 4.1 μm and a fully amorphous structure was produced. Among the metallic glass gratings for X-ray phase imaging, the grating fabricated in this study shows high aspect ratio of ~8.7. As a demonstration, the grating performance was investigated by constructing a simple diffraction apparatus, revealing that the positions of the experimentally observed diffraction spots were consistent with the calculated ones. The results suggested that it can be considered as potential for the grating of X-ray Talbot interferometer.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"34 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hybrid lead halide perovskites are promising next-generation materials for optoelectronic applications, including LEDs, lasers, photodetectors, and solar cells. This study focuses on precise photophysical characterization and synthesis optimization to achieve controlled emission band tuning. Using the inverse temperature crystallization (ITC) method, we addressed key synthesis challenges such as solvent-specific precursor solubility limitations. To improve PbCl₂ solubility in DMF, we prepared MACl:PbCl₂ solutions in DMSO at 140°C then diluted with DMF. Similarly, MAPbI₃ in GBL exhibited unique solvothermal behavior, favoring luminescent crystallization at 110°C. A systematic shift in the transmittance edge was observed, ranging from 780 nm for MAPbI₃ to 549 nm for MAPbBr₃ and 421 nm for MAPbCl₃. Red-shifting from bright green (MAPbBr₃) to blood-red (MAPbBr₁.₅I₁.₅, 650 nm) was achieved, with intermediate Br:I compositions yielding yellow (590 nm) and orange (605 nm) emissions. Similarly, varying Br:Cl ratios resulted in tunable blue emissions from deep blue (441 nm) to cyanine (490 nm). A major challenge in hybrid perovskite photophysical characterization is phase segregation under UV excitation, leading to dual-color emission. To mitigate this, we employed controlled excitation light intensity, low-temperature measurements, two-photon absorption, and pulsed laser excitation. A scanning-mode measurement approach further enhanced emission accuracy. This study advances hybrid perovskite research by refining emission band fine-tuning methodologies, providing critical insights for the development of high-performance optoelectronic devices.
{"title":"Precise Emission Bandgap Engineering in Hybrid Perovskite: An ITC Approach","authors":"Md. Jahidul Islam, Mudassar Shahid, Md Aslam Uddin","doi":"10.1016/j.jallcom.2025.180114","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180114","url":null,"abstract":"Hybrid lead halide perovskites are promising next-generation materials for optoelectronic applications, including LEDs, lasers, photodetectors, and solar cells. This study focuses on precise photophysical characterization and synthesis optimization to achieve controlled emission band tuning. Using the inverse temperature crystallization (ITC) method, we addressed key synthesis challenges such as solvent-specific precursor solubility limitations. To improve PbCl₂ solubility in DMF, we prepared MACl:PbCl₂ solutions in DMSO at 140°C then diluted with DMF. Similarly, MAPbI₃ in GBL exhibited unique solvothermal behavior, favoring luminescent crystallization at 110°C. A systematic shift in the transmittance edge was observed, ranging from 780<!-- --> <!-- -->nm for MAPbI₃ to 549<!-- --> <!-- -->nm for MAPbBr₃ and 421<!-- --> <!-- -->nm for MAPbCl₃. Red-shifting from bright green (MAPbBr₃) to blood-red (MAPbBr₁.₅I₁.₅, 650<!-- --> <!-- -->nm) was achieved, with intermediate Br:I compositions yielding yellow (590<!-- --> <!-- -->nm) and orange (605<!-- --> <!-- -->nm) emissions. Similarly, varying Br:Cl ratios resulted in tunable blue emissions from deep blue (441<!-- --> <!-- -->nm) to cyanine (490<!-- --> <!-- -->nm). A major challenge in hybrid perovskite photophysical characterization is phase segregation under UV excitation, leading to dual-color emission. To mitigate this, we employed controlled excitation light intensity, low-temperature measurements, two-photon absorption, and pulsed laser excitation. A scanning-mode measurement approach further enhanced emission accuracy. This study advances hybrid perovskite research by refining emission band fine-tuning methodologies, providing critical insights for the development of high-performance optoelectronic devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"32 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-02DOI: 10.1016/j.jallcom.2025.180099
Yan Long, You Lou, Kebo Liao, Zhaolin Jiang, Dezhi Zhu
The thermal stability of the microstructure and the associated changes in mechanical properties are critical factors for the high-temperature performance of refractory high-entropy alloys (RHEAs). In this study, we fabricated a series of TiVNbTaAlx (x = 0, 0.1, 0.2, 0.3) RHEAs with the single-phase body-centered cubic (BCC) structure and investigated the phase precipitation behavior of those alloys after annealing at 400–800°C for 100 hours. When annealing temperatures were below 600°C, no significant changes were observed in the alloys' microstructure. However, after annealing at 800°C, all alloys precipitated Ti-rich phases. Remarkably, in addition to the hexagonal close-packed (HCP) Ti-rich phase, we identified a rare face-centered cubic (FCC) Ti-rich phase precipitating from the BCC matrix—a phenomenon seldom observed in Ti-containing HEAs and Ti alloys under normal conditions. In the TiVNbTa base alloy, the precipitate was predominantly an acicular FCC phase, while in Al0.1 and Al0.2, the formation of the FCC phase was suppressed, and a small amount of granular HCP phase precipitated at the grain boundary. When Al content (x) increased to 0.3, numerous rod-like FCC phase and granular HCP phase formed both at the grain boundary and within the grains. Although the addition of Al increased the yield strength of the RHEAs through solid-solution strengthening, the alloys' thermal stability decreased, and the fraction of precipitate phase generally increased with higher Al content. Therefore, a significant reduction in compressive yield strength and plasticity occurred in Al0.3 alloy after annealing at 800°C. These novel findings are crucial for enhancing our understanding of phase precipitation behavior in RHEAs at elevated temperatures.
{"title":"Phase precipitation behavior and mechanical properties of TiVNbTaAlx refractory high-entropy alloys after annealing at medium temperatures","authors":"Yan Long, You Lou, Kebo Liao, Zhaolin Jiang, Dezhi Zhu","doi":"10.1016/j.jallcom.2025.180099","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180099","url":null,"abstract":"The thermal stability of the microstructure and the associated changes in mechanical properties are critical factors for the high-temperature performance of refractory high-entropy alloys (RHEAs). In this study, we fabricated a series of TiVNbTaAl<sub>x</sub> (x = 0, 0.1, 0.2, 0.3) RHEAs with the single-phase body-centered cubic (BCC) structure and investigated the phase precipitation behavior of those alloys after annealing at 400–800°C for 100<!-- --> <!-- -->hours. When annealing temperatures were below 600°C, no significant changes were observed in the alloys' microstructure. However, after annealing at 800°C, all alloys precipitated Ti-rich phases. Remarkably, in addition to the hexagonal close-packed (HCP) Ti-rich phase, we identified a rare face-centered cubic (FCC) Ti-rich phase precipitating from the BCC matrix—a phenomenon seldom observed in Ti-containing HEAs and Ti alloys under normal conditions. In the TiVNbTa base alloy, the precipitate was predominantly an acicular FCC phase, while in Al0.1 and Al0.2, the formation of the FCC phase was suppressed, and a small amount of granular HCP phase precipitated at the grain boundary. When Al content (x) increased to 0.3, numerous rod-like FCC phase and granular HCP phase formed both at the grain boundary and within the grains. Although the addition of Al increased the yield strength of the RHEAs through solid-solution strengthening, the alloys' thermal stability decreased, and the fraction of precipitate phase generally increased with higher Al content. Therefore, a significant reduction in compressive yield strength and plasticity occurred in Al0.3 alloy after annealing at 800°C. These novel findings are crucial for enhancing our understanding of phase precipitation behavior in RHEAs at elevated temperatures.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"34 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-02DOI: 10.1016/j.jallcom.2025.180079
Bo Zhou , Ziyan Zhao , Bo Wang , Hui Zhang , Xuejian Liu , Zhengren Huang , Defeng Mo , Yan Liu
The reliability of lead zirconate titanate (PZT) ceramics/4J29 Kovar alloy joints is essential for the performance of piezoelectric transducers during drilling operations. This study investigates the use of Sn-Ag-Cu solder as a substitute for organic adhesives to improve joint performance. A (Ti + Ni + Cu) metallization layer was applied to PZT ceramics to enhance solder wettability and facilitate the formation of a reliable joint. Stable joints are formed as Sn diffuses into the 4J29 Kovar alloy, creating a diffusion layer. Simultaneously, Sn, Cu, and Ni combine to form a homogeneous intermetallic compounds (IMCs) layer that effectively bonds the solder to the metallization. Optimal layer thicknesses of Ni (2000 nm) and Cu (150 nm) yield a maximum joint strength of 33.0 ± 3.2 MPa. The aging time significantly impacts IMCs thickness and joint strength; longer aging periods increase IMCs thickness while reducing joint strength. This research highlights the potential of Sn-Ag-Cu solder for joining metallized PZT ceramics and the 4J29 Kovar alloy, providing valuable insights for future developments in solder systems.
{"title":"Optimization of PZT-to-4J29 Kovar alloy bonding: Influence of metallization layer thickness and isothermal aging time on joint performance","authors":"Bo Zhou , Ziyan Zhao , Bo Wang , Hui Zhang , Xuejian Liu , Zhengren Huang , Defeng Mo , Yan Liu","doi":"10.1016/j.jallcom.2025.180079","DOIUrl":"10.1016/j.jallcom.2025.180079","url":null,"abstract":"<div><div>The reliability of lead zirconate titanate (PZT) ceramics/4J29 Kovar alloy joints is essential for the performance of piezoelectric transducers during drilling operations. This study investigates the use of Sn-Ag-Cu solder as a substitute for organic adhesives to improve joint performance. A (Ti + Ni + Cu) metallization layer was applied to PZT ceramics to enhance solder wettability and facilitate the formation of a reliable joint. Stable joints are formed as Sn diffuses into the 4J29 Kovar alloy, creating a diffusion layer. Simultaneously, Sn, Cu, and Ni combine to form a homogeneous intermetallic compounds (IMCs) layer that effectively bonds the solder to the metallization. Optimal layer thicknesses of Ni (2000 nm) and Cu (150<!--> <!-->nm) yield a maximum joint strength of 33.0 ± 3.2<!--> <!-->MPa. The aging time significantly impacts IMCs thickness and joint strength; longer aging periods increase IMCs thickness while reducing joint strength. This research highlights the potential of Sn-Ag-Cu solder for joining metallized PZT ceramics and the 4J29 Kovar alloy, providing valuable insights for future developments in solder systems.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1023 ","pages":"Article 180079"},"PeriodicalIF":5.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-02DOI: 10.1016/j.jallcom.2025.180193
Milad Hosseini , Jafar Khalil-Allafi , Mir Saman Safavi , Arash Ghalandarzadeh
This study concentrated on improving the characteristics of hydroxyapatite (HA) coatings through the addition of varying concentrations of tantalum pentoxide (Ta2O5) nanoparticles, ranging from 0 to 1.5 g/L, to the electrolyte solution. The HA-Ta2O5 composite coatings were deposited on the Ti6Al4V metallic implant utilizing the plasma electrolytic oxidation (PEO) method. Although the addition of Ta2O5 nanoparticles to the electrolyte did not vary the phase composition of the films, more compact and denser coatings were achieved with the embedded nanoparticles. Energy-dispersive X-ray spectroscopy (EDS) elemental mapping and Fourier transform infrared spectroscopy (FTIR) tests were used to confirm the codeposition of the nanoparticles with the HA matrix, and evaluate the uniformity of the nanoparticle distribution throughout the coating. The compatibility of the coatings with osteoblast cells was determined using the MG-63 osteoblastic cell line. The findings indicated a beneficial effect of the incorporated Ta2O5 nanoparticles on osteoblastic cell functions adhered to the composite coatings. Additionally, the antibacterial activity of the coatings against Escherichia coli and Staphylococcus aureus pathogenic bacteria was examined by plate-counting assay, and results indicated that the higher nanoparticle content in the coatings stimulated the more robust antibacterial activity. The adopted strategy is capable of rendering substantial progress in surface modification of the metallic implants.
{"title":"Fascinating osteoblast compatibility and antibacterial activity of HA-Ta2O5 composite coating deposited by plasma electrolytic oxidation","authors":"Milad Hosseini , Jafar Khalil-Allafi , Mir Saman Safavi , Arash Ghalandarzadeh","doi":"10.1016/j.jallcom.2025.180193","DOIUrl":"10.1016/j.jallcom.2025.180193","url":null,"abstract":"<div><div>This study concentrated on improving the characteristics of hydroxyapatite (HA) coatings through the addition of varying concentrations of tantalum pentoxide (Ta<sub>2</sub>O<sub>5</sub>) nanoparticles, ranging from 0 to 1.5<!--> <!-->g/L, to the electrolyte solution. The HA-Ta<sub>2</sub>O<sub>5</sub> composite coatings were deposited on the Ti6Al4V metallic implant utilizing the plasma electrolytic oxidation (PEO) method. Although the addition of Ta<sub>2</sub>O<sub>5</sub> nanoparticles to the electrolyte did not vary the phase composition of the films, more compact and denser coatings were achieved with the embedded nanoparticles. Energy-dispersive X-ray spectroscopy (EDS) elemental mapping and Fourier transform infrared spectroscopy (FTIR) tests were used to confirm the codeposition of the nanoparticles with the HA matrix, and evaluate the uniformity of the nanoparticle distribution throughout the coating. The compatibility of the coatings with osteoblast cells was determined using the MG-63 osteoblastic cell line. The findings indicated a beneficial effect of the incorporated Ta<sub>2</sub>O<sub>5</sub> nanoparticles on osteoblastic cell functions adhered to the composite coatings. Additionally, the antibacterial activity of the coatings against Escherichia coli and Staphylococcus aureus pathogenic bacteria was examined by plate-counting assay, and results indicated that the higher nanoparticle content in the coatings stimulated the more robust antibacterial activity. The adopted strategy is capable of rendering substantial progress in surface modification of the metallic implants.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1023 ","pages":"Article 180193"},"PeriodicalIF":5.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-02DOI: 10.1016/j.jallcom.2025.180206
Zhilei Hao , Shaoqi Shi , Baojun Wang , Pei Liu , Qingqing Gao , Kai Xu , Yinxu Ni , Zhaoxia Tian , Wei Xiao , Changtian Zhu , Gaojie Xu , Hui Zhang , Fenghua Liu
With the escalating severity of electromagnetic pollution, there arises an urgent necessity to exploit microwave absorption (MA) materials. Vacancy engineering has been demonstrated to be successful approaches of developing high-performance absorbers. The Co3O4/C/N-doped carbon nanonets (NCNs) hierarchical composites was synthesized by utilizing 3D NCNs as the conductive matrix and flower-shaped Co-MOF derivatives as the impedance modulator in this work. The three-dimensional conductive network of NCNs facilitates the transfer and hopping of free electrons, significantly elevating the conductive loss. By modulating the pyrolysis temperature, MOF derivatives construct continuous cavity boundaries that promote multiple reflections and scattering of electromagnetic wave (EMW), while simultaneously introducing oxygen-rich vacancies to enhance polarization effects and conductivity. When the pyrolysis temperature was 350 ℃, by the successful establishment of oxygen vacancies, the NCM-350 achieved an exceptional reflection loss of −78.1 dB at 2.38 mm. This investigation introduces an approach for the adjustable MA property of absorbers, offering a viable technique to enhance dielectric loss while maintaining a balance between polarization loss and conduction loss.
{"title":"Constructing oxygen-rich vacancies for efficient microwave absorption in Co3O4/C/N-doped carbon nanonets","authors":"Zhilei Hao , Shaoqi Shi , Baojun Wang , Pei Liu , Qingqing Gao , Kai Xu , Yinxu Ni , Zhaoxia Tian , Wei Xiao , Changtian Zhu , Gaojie Xu , Hui Zhang , Fenghua Liu","doi":"10.1016/j.jallcom.2025.180206","DOIUrl":"10.1016/j.jallcom.2025.180206","url":null,"abstract":"<div><div>With the escalating severity of electromagnetic pollution, there arises an urgent necessity to exploit microwave absorption (MA) materials. Vacancy engineering has been demonstrated to be successful approaches of developing high-performance absorbers. The Co<sub>3</sub>O<sub>4</sub>/C/N-doped carbon nanonets (NCNs) hierarchical composites was synthesized by utilizing 3D NCNs as the conductive matrix and flower-shaped Co-MOF derivatives as the impedance modulator in this work. The three-dimensional conductive network of NCNs facilitates the transfer and hopping of free electrons, significantly elevating the conductive loss. By modulating the pyrolysis temperature, MOF derivatives construct continuous cavity boundaries that promote multiple reflections and scattering of electromagnetic wave (EMW), while simultaneously introducing oxygen-rich vacancies to enhance polarization effects and conductivity. When the pyrolysis temperature was 350 ℃, by the successful establishment of oxygen vacancies, the NCM-350 achieved an exceptional reflection loss of −78.1 dB at 2.38 mm. This investigation introduces an approach for the adjustable MA property of absorbers, offering a viable technique to enhance dielectric loss while maintaining a balance between polarization loss and conduction loss.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1024 ","pages":"Article 180206"},"PeriodicalIF":5.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-02DOI: 10.1016/j.jallcom.2025.180205
Yijia Wang , Sijun Cao , Jun’an Lai , Kang An , Daofu Wu , Jinquan Chen , Haimen Mu , Zixian Wang , Linfeng Guo , Peng He , Xiaosheng Tang
Metal halides with high luminescence properties have emerged as novel candidate scintillators for X-ray detection and imaging. Low-dimensional organic-inorganic halide, which consists of heavy metals with a free composition, provides unique optical properties and luminescence applications. Herein, a lead-free zero-dimensional antimony hybrid single crystal-(MPP)2SbCl5 (MPP = Methyltriphenylphosphonium) is developed through facile synthesis with nearly 100 % photoluminescence quantum yield peaking at 590 nm. The (MPP)2SbCl5 single crystal exhibits fantastic thermal stability with a phase transition temperature of 600 K and air stability with exposure to air for at least 6 months. Moreover, single crystals with a product yield of 100 % are prepared by an environment-friendly method that is devoid of any toxic solvents and pollution throughout the process. A light-emitting diode device using broad-band emissive single crystal (MPP)2SbCl5, green emission—MPP2MnCl4, and blue emission—anthracene on a 365 nm GaN chip exhibits a pure white light (color rendering index, CRI = 93). Meanwhile, (MPP)2SbCl5 single crystal exhibits excellent scintillation performance, with a high light yield of 28,000 photons MeV−1 and a low detection limit of 532 nGy s−1. The flexible scintillation screen based on (MPP)2SbCl5 was fabricated using the vacuum filtration method, displaying a spatial resolution of 18.4 lp mm−1, which shows great potential for use in X-ray imaging. In addition, a 3D visual computed tomography (CT) image of a conch was successfully reconstructed, which indicates the fantastic potential of environment-friendly (MPP)2SbCl5 in optoelectronic detection applications.
{"title":"Environment-friendly and highly efficiency organic antimony halide scintillator for light emitting diode and X-ray imaging","authors":"Yijia Wang , Sijun Cao , Jun’an Lai , Kang An , Daofu Wu , Jinquan Chen , Haimen Mu , Zixian Wang , Linfeng Guo , Peng He , Xiaosheng Tang","doi":"10.1016/j.jallcom.2025.180205","DOIUrl":"10.1016/j.jallcom.2025.180205","url":null,"abstract":"<div><div>Metal halides with high luminescence properties have emerged as novel candidate scintillators for X-ray detection and imaging. Low-dimensional organic-inorganic halide, which consists of heavy metals with a free composition, provides unique optical properties and luminescence applications. Herein, a lead-free zero-dimensional antimony hybrid single crystal-(MPP)<sub>2</sub>SbCl<sub>5</sub> (MPP = Methyltriphenylphosphonium) is developed through facile synthesis with nearly 100 % photoluminescence quantum yield peaking at 590 nm. The (MPP)<sub>2</sub>SbCl<sub>5</sub> single crystal exhibits fantastic thermal stability with a phase transition temperature of 600 K and air stability with exposure to air for at least 6 months. Moreover, single crystals with a product yield of 100 % are prepared by an environment-friendly method that is devoid of any toxic solvents and pollution throughout the process. A light-emitting diode device using broad-band emissive single crystal (MPP)<sub>2</sub>SbCl<sub>5</sub>, green emission—MPP<sub>2</sub>MnCl<sub>4</sub>, and blue emission—anthracene on a 365 nm GaN chip exhibits a pure white light (color rendering index, CRI = 93). Meanwhile, (MPP)<sub>2</sub>SbCl<sub>5</sub> single crystal exhibits excellent scintillation performance, with a high light yield of 28,000 photons MeV<sup>−1</sup> and a low detection limit of 532 nGy s<sup>−1</sup>. The flexible scintillation screen based on (MPP)<sub>2</sub>SbCl<sub>5</sub> was fabricated using the vacuum filtration method, displaying a spatial resolution of 18.4 lp mm<sup>−1</sup>, which shows great potential for use in X-ray imaging. In addition, a 3D visual computed tomography (CT) image of a conch was successfully reconstructed, which indicates the fantastic potential of environment-friendly (MPP)<sub>2</sub>SbCl<sub>5</sub> in optoelectronic detection applications.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1024 ","pages":"Article 180205"},"PeriodicalIF":5.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-02DOI: 10.1016/j.jallcom.2025.180207
Jiangkai Yu, Yujia Dou, Ju Zhao, Shengtian Zhu, Kai Zhang, Fei Huang
Metal oxide semiconductors have emerged as a cornerstone in the development of solution-processed photovoltaic devices, driven by their unique physical and chemical properties. This review highlights the multifunctional roles of four key metal oxides-zinc oxide (ZnO), nickel oxide (NiOX), tin oxide (SnO2), and titanium oxide (TiO2) in enhancing the performance and stability of organic and perovskite solar cells. These materials serve as electron and hole transport layers and demonstrate exceptional properties such as high carrier mobility, optical transparency, chemical stability, and tunable energy level. It also delves into strategies such as doping, interfacial engineering, and defect control to address challenges related to efficiency and stability. By analyzing practical examples, the review highlights how these optimization approaches drive breakthroughs in device efficiency, stability, and scalability. Through a comprehensive analysis of these metal oxides, this review underscores their critical role in achieving efficient, cost-effective, and scalable solution-processed photovoltaic technologies. Furthermore, it provides researchers with actionable technical insights and development strategies, fostering continuous advancements in renewable energy technologies and contributing to the global pursuit of sustainable energy solutions.
{"title":"A review of metal oxide semiconductors: Progress in solution-processed photovoltaic Technologies","authors":"Jiangkai Yu, Yujia Dou, Ju Zhao, Shengtian Zhu, Kai Zhang, Fei Huang","doi":"10.1016/j.jallcom.2025.180207","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180207","url":null,"abstract":"Metal oxide semiconductors have emerged as a cornerstone in the development of solution-processed photovoltaic devices, driven by their unique physical and chemical properties. This review highlights the multifunctional roles of four key metal oxides-zinc oxide (ZnO), nickel oxide (NiO<sub><em>X</em></sub>), tin oxide (SnO<sub>2</sub>), and titanium oxide (TiO<sub>2</sub>) in enhancing the performance and stability of organic and perovskite solar cells. These materials serve as electron and hole transport layers and demonstrate exceptional properties such as high carrier mobility, optical transparency, chemical stability, and tunable energy level. It also delves into strategies such as doping, interfacial engineering, and defect control to address challenges related to efficiency and stability. By analyzing practical examples, the review highlights how these optimization approaches drive breakthroughs in device efficiency, stability, and scalability. Through a comprehensive analysis of these metal oxides, this review underscores their critical role in achieving efficient, cost-effective, and scalable solution-processed photovoltaic technologies. Furthermore, it provides researchers with actionable technical insights and development strategies, fostering continuous advancements in renewable energy technologies and contributing to the global pursuit of sustainable energy solutions.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"28 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-02DOI: 10.1016/j.jallcom.2025.180202
Yuanmin Tu , Jundong Wang , Zhixun Wen , Pengfei He
This study systematically investigates the thermomechanical fatigue (TMF) behavior of DD6 nickel-based single-crystal superalloys under varying stress conditions and obtains lifetime distribution data for two distinct phases. Fractographic and microstructural analyses reveal the failure mechanisms of the alloy at different stages. Furthermore, two machine learning-based lifetime prediction methods are proposed. The first method compares the predictive performance of multiple machine learning models, identifying the most effective model and conducting a detailed analysis of the most influential energy-related input features. The second method integrates a sequence learning model with a backpropagation neural network (BPNN), incorporating an attention mechanism to enhance prediction accuracy and generalization capability. The results demonstrate a strong correlation between experimental data and predictions, confirming the effectiveness of both approaches in TMF lifetime prediction. Notably, the sequence learning-based hybrid model outperforms in terms of accuracy and applicability, highlighting its potential for broad engineering applications.
{"title":"Thermomechanical Fatigue Behavior and Lifetime Prediction of Nickel-Based Single Crystal Alloys Under Varying Stress Conditions","authors":"Yuanmin Tu , Jundong Wang , Zhixun Wen , Pengfei He","doi":"10.1016/j.jallcom.2025.180202","DOIUrl":"10.1016/j.jallcom.2025.180202","url":null,"abstract":"<div><div>This study systematically investigates the thermomechanical fatigue (TMF) behavior of DD6 nickel-based single-crystal superalloys under varying stress conditions and obtains lifetime distribution data for two distinct phases. Fractographic and microstructural analyses reveal the failure mechanisms of the alloy at different stages. Furthermore, two machine learning-based lifetime prediction methods are proposed. The first method compares the predictive performance of multiple machine learning models, identifying the most effective model and conducting a detailed analysis of the most influential energy-related input features. The second method integrates a sequence learning model with a backpropagation neural network (BPNN), incorporating an attention mechanism to enhance prediction accuracy and generalization capability. The results demonstrate a strong correlation between experimental data and predictions, confirming the effectiveness of both approaches in TMF lifetime prediction. Notably, the sequence learning-based hybrid model outperforms in terms of accuracy and applicability, highlighting its potential for broad engineering applications.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1023 ","pages":"Article 180202"},"PeriodicalIF":5.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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