Pub Date : 2025-04-24DOI: 10.1016/j.jallcom.2025.180608
Ravi Teja Mittireddi, Mayank Dotiyal, Priyanka Hemani, Ranjan Kumar Singh, Emila Panda
Permanent loss of hard ferromagnetic characteristics in Sm2(Co, Fe, Cu, Zr)17 (2:17) alloys on account of disruption in microchemical characteristics of their cellular nanostructure due to thermal oxidation, is a key determinant for their selection concerning prolonged application cycles under extreme conditions. However, studies in the context of microchemical induced magnetic changes in thermally oxidized 2:17 alloys are found to be limited in the literature. In this regard, this study systematically investigates the bulk and the surface magnetic changes induced in thermally oxidized (in the temperature range of 373 K to 973 K at P = 1.013 × 105 Pa) 2:17 permanent magnets of two different alloy grades. Changes in the bulk and the surface magnetic properties are then systematically correlated with the associated microchemical alterations observed in these oxidized alloys. Whereas formation of distinct deterioration zone(s), in variedvolume fractions at different oxidation conditions at the expense of hard magnetic phases are attributed to the overall decline in the bulk magnetic characteristics, formation of transition-metal oxides, like, Fe3O4, Co3O4, CuO and Cu2O near the alloy/oxide-ambient interface are attributed to the observed increase in in-plane magnetic anisotropy. In the end, operating conditions and strategies to combat the irrecoverable losses of magnetic properties are outlined.
{"title":"Microchemical induced magnetic changes in thermally oxidized Sm2(Co, Fe, Cu, Zr)17 alloys","authors":"Ravi Teja Mittireddi, Mayank Dotiyal, Priyanka Hemani, Ranjan Kumar Singh, Emila Panda","doi":"10.1016/j.jallcom.2025.180608","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180608","url":null,"abstract":"Permanent loss of hard ferromagnetic characteristics in Sm<sub>2</sub>(Co, Fe, Cu, Zr)<sub>17</sub> (2:17) alloys on account of disruption in microchemical characteristics of their cellular nanostructure due to thermal oxidation, is a key determinant for their selection concerning prolonged application cycles under extreme conditions. However, studies in the context of microchemical induced magnetic changes in thermally oxidized 2:17 alloys are found to be limited in the literature. In this regard, this study systematically investigates the bulk and the surface magnetic changes induced in thermally oxidized (in the temperature range of 373<!-- --> <!-- -->K to 973<!-- --> <!-- -->K at <em>P</em> = 1.013 × 10<sup>5</sup> Pa) 2:17 permanent magnets of two different alloy grades. Changes in the bulk and the surface magnetic properties are then systematically correlated with the associated microchemical alterations observed in these oxidized alloys. Whereas formation of distinct deterioration zone(s), in variedvolume fractions at different oxidation conditions at the expense of hard magnetic phases are attributed to the overall decline in the bulk magnetic characteristics, formation of transition-metal oxides, like, Fe<sub>3</sub>O<sub>4</sub>, Co<sub>3</sub>O<sub>4</sub>, CuO and Cu<sub>2</sub>O near the alloy/oxide-ambient interface are attributed to the observed increase in in-plane magnetic anisotropy. In the end, operating conditions and strategies to combat the irrecoverable losses of magnetic properties are outlined.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"17 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143866208","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 : 2025-04-24DOI: 10.1016/j.jallcom.2025.180594
Nirali S. Kanani, Dolly J. Parekh, Nimish H. Vasoya, Pravina P. Pawar, Kunal B. Modi, Chaitali V. More
Exposure to ionizing radiation including γ-rays and X-rays has detrimental effects on organisms, tissues, and living cells. Consequently, shielding against such radiation is of prime importance, especially when using different materials. This investigation examines the consequence of Fe3+- substitution on gamma-radiation shielding capability of quadruple perovskites, CaCu3-xFe2xTi4-xO12 (x = 0.0, 0.1, 0.3, 0.5, 0.7). The shielding parameters, namely linear and mass attenuation coefficients, half and tenth value layers, relaxation length, fast neutron removal cross-section, effective and equivalent atomic numbers, energy absorption and exposure build-up factors, effective electron density, radiation protection efficiency and transmission factor have been determined. An adequate agreement between experimentally determined and theoretically calculated parameters using WinXCom software has been found. The change in shielding parameters with respect to Fe3+- substitution (x) and incoming photon energy has been corroborated in terms of structural and microstructural parameters and three distinct inelastic photon interaction mechanisms. Based on the magnitude of certain deciding parameters, it is concluded that pristine (x = 0.0) and compositions with low Fe-content (x = 0.1, 0.3) are suitable replacements for a wide range of other standard materials. They possess the capability to be utilized as protective materials.
{"title":"Optimizing Gamma Radiation Defence through Strategic Fe3+- Substitution in CaCu3Ti4O12","authors":"Nirali S. Kanani, Dolly J. Parekh, Nimish H. Vasoya, Pravina P. Pawar, Kunal B. Modi, Chaitali V. More","doi":"10.1016/j.jallcom.2025.180594","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180594","url":null,"abstract":"Exposure to ionizing radiation including γ-rays and X-rays has detrimental effects on organisms, tissues, and living cells. Consequently, shielding against such radiation is of prime importance, especially when using different materials. This investigation examines the consequence of Fe<sup>3+</sup>- substitution on gamma-radiation shielding capability of quadruple perovskites, CaCu<sub>3-<em>x</em></sub>Fe<sub>2<em>x</em></sub>Ti<sub>4-<em>x</em></sub>O<sub>12</sub> (<em>x =</em> 0.0, 0.1, 0.3, 0.5, 0.7). The shielding parameters, namely linear and mass attenuation coefficients, half and tenth value layers, relaxation length, fast neutron removal cross-section, effective and equivalent atomic numbers, energy absorption and exposure build-up factors, effective electron density, radiation protection efficiency and transmission factor have been determined. An adequate agreement between experimentally determined and theoretically calculated parameters using WinXCom software has been found. The change in shielding parameters with respect to Fe<sup>3+</sup>- substitution (<em>x</em>) and incoming photon energy has been corroborated in terms of structural and microstructural parameters and three distinct inelastic photon interaction mechanisms. Based on the magnitude of certain deciding parameters, it is concluded that pristine (<em>x</em> = 0.0) and compositions with low Fe-content (<em>x</em> = 0.1, 0.3) are suitable replacements for a wide range of other standard materials. They possess the capability to be utilized as protective materials.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"48 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872302","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}
Enhancing the strength of titanium alloys through aluminum addition is well-established but often results in significantly reduced ductility. Additive manufacturing (AM) presents a novel approach to fabricating titanium alloys, addressing the persistent challenge of balancing strength and ductility. This study compares the microstructural and mechanical properties of typical Ti-Al alloys produced using conventional casting and AM techniques. The results indicate that, compared to their as-cast counterparts, AM-fabricated Ti-6Al alloys exhibit a remarkable 90% improvement in yield strength and nearly double the tensile ductility. The enhanced performance of AM alloys is attributed to their refined microstructures, increased dislocation densities, and ultra-high solid solubility, resulting from AM's rapid solidification rates and complex thermal histories. Detailed characterizations reveal that these microstructural features contribute to increased strain hardening and enhanced plastic deformation capacity. This research underscores the potential of AM to revolutionize material properties through microstructural control, providing valuable insights for future alloy design and manufacturing strategies.
{"title":"Enhanced Strength and Ductility in α-Titanium Alloys through in-situ Alloying via Additive Manufacturing","authors":"Xingdong Dan, Chuanxi Ren, Dongdong Zhang, Xuanlai Chen, Qi Liu, Hengchao Shi, K.C. Chan, Ni Song, Dingding Xiang, Haoran Sun, Zhiyuan Liu, Zibin Chen","doi":"10.1016/j.jallcom.2025.180598","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180598","url":null,"abstract":"Enhancing the strength of titanium alloys through aluminum addition is well-established but often results in significantly reduced ductility. Additive manufacturing (AM) presents a novel approach to fabricating titanium alloys, addressing the persistent challenge of balancing strength and ductility. This study compares the microstructural and mechanical properties of typical Ti-Al alloys produced using conventional casting and AM techniques. The results indicate that, compared to their as-cast counterparts, AM-fabricated Ti-6Al alloys exhibit a remarkable 90% improvement in yield strength and nearly double the tensile ductility. The enhanced performance of AM alloys is attributed to their refined microstructures, increased dislocation densities, and ultra-high solid solubility, resulting from AM's rapid solidification rates and complex thermal histories. Detailed characterizations reveal that these microstructural features contribute to increased strain hardening and enhanced plastic deformation capacity. This research underscores the potential of AM to revolutionize material properties through microstructural control, providing valuable insights for future alloy design and manufacturing strategies.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"69 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143866203","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 : 2025-04-24DOI: 10.1016/j.jallcom.2025.180619
Bin Zhang, Pan Ying, Rongxin Sun, Chen Chen, Yufei Gao, Mengdong Ma, Bo Xu
Boron suboxide (B6O) and boron carbide (B4C) ceramics are promising structure materials due to their remarkable hardness, but their practical applications are limited by insufficient fracture toughness. While composite strategies offer potential solutions, conventional direct sintering methods often fail to achieve optimal mechanical properties. Here, we report a novel approach using carbon-coated B4C powders as precursors to synthesize B6O/B4C composite ceramics via high-pressure sintering. During high-pressure high-temperature (HPHT) processing, the carbon shells over B4C powders reacted with B6O to form B4C in situ, resulting in enhanced grain boundary strength. The composites exhibited a synergistic enhancement in hardness and toughness with increasing B4C content. The optimized B6O/B4C composite (containing 50 wt% B4C) exhibits superior mechanical properties with a hardness of 40.5 GPa and toughness of 4.8 MPa·m0.5, surpassing both pure phases. This work demonstrates an effective strategy for fabricating high-performance ceramic composites through in-situ reaction sintering, providing new opportunities for developing advanced structural ceramics.
{"title":"In-Situ reaction-assisted high-pressure sintering of B6O/B4C composites with enhanced mechanical properties","authors":"Bin Zhang, Pan Ying, Rongxin Sun, Chen Chen, Yufei Gao, Mengdong Ma, Bo Xu","doi":"10.1016/j.jallcom.2025.180619","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180619","url":null,"abstract":"Boron suboxide (B<sub>6</sub>O) and boron carbide (B<sub>4</sub>C) ceramics are promising structure materials due to their remarkable hardness, but their practical applications are limited by insufficient fracture toughness. While composite strategies offer potential solutions, conventional direct sintering methods often fail to achieve optimal mechanical properties. Here, we report a novel approach using carbon-coated B<sub>4</sub>C powders as precursors to synthesize B<sub>6</sub>O/B<sub>4</sub>C composite ceramics via high-pressure sintering. During high-pressure high-temperature (HPHT) processing, the carbon shells over B<sub>4</sub>C powders reacted with B<sub>6</sub>O to form B<sub>4</sub>C in situ, resulting in enhanced grain boundary strength. The composites exhibited a synergistic enhancement in hardness and toughness with increasing B<sub>4</sub>C content. The optimized B<sub>6</sub>O/B<sub>4</sub>C composite (containing 50<!-- --> <!-- -->wt% B<sub>4</sub>C) exhibits superior mechanical properties with a hardness of 40.5<!-- --> <!-- -->GPa and toughness of 4.8<!-- --> <!-- -->MPa·m<sup>0.5</sup>, surpassing both pure phases. This work demonstrates an effective strategy for fabricating high-performance ceramic composites through in-situ reaction sintering, providing new opportunities for developing advanced structural ceramics.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"7 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872300","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}
Polymer-based dielectric materials are widely used in high-pulse electronic power systems to achieve energy storage and conversion. However, the miniaturization and high integration devices require for the advancement of polymer-based dielectrics with enhanced heat dissipation and energy density. Herein, sandwich-structured epoxy-based multilayer composite have been successfully achieved to explore the influence of morphological state of multiphase on thermal conductivity (TC) and dielectric properties. Dopamine-modified reduced graphene oxide (RGO@PDA) was introduced as 2D nanosheets to enhance the dielectric displacement, while, boron nitride nanosheets (BNNS) were incorporated to improve the TC and preserve low dielectric loss of epoxy-based dielectrics. In addition, poly(vinylidene fluoride) (PVDF) as outer layer was utilized to achieve high dielectric constant simultaneously. The resultant sandwich-structured PVEP-1.5 composite (with the central epoxy/polyetherimide (EP/PEI) layer and the outer PVDF layers) possessed an optimized high dielectric constant ε’ of 24.1 and exhibited a maximum TC of 1.22 W·m-1K-1. The ε’ was 6 times higher than EP/PEI single layer and 2.4 times higher than PVDF single layer, and the TC enhancement efficiency was up to 330%. The breakdown strength (Eb) and energy storage density (Ue) of PVEP-1.5 reached 176 kV·mm-1 and 1.5 J·cm-3, respectively, representing a remarkable improvement over the pristine EP/PEI (Eb = 47.3 kV·mm-1 and Ue = 0.044 J·cm-3). The synergetic effect of multiphase morphology and the selective distribution 2D nanosheets presented great potential for the fabrication of epoxy-based multilayer composites with enhanced energy storage performance and superior heat dissipation property.
{"title":"Enhanced dielectric properties of epoxy-based multilayer composite with highly-controlled distribution of 2D nanomatierals","authors":"Tiancheng Lu, Tianyu Lu, Ziyun Wang, Weizhen Li, Shiqiang Song, Wenjun Gan","doi":"10.1016/j.jallcom.2025.180611","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180611","url":null,"abstract":"Polymer-based dielectric materials are widely used in high-pulse electronic power systems to achieve energy storage and conversion. However, the miniaturization and high integration devices require for the advancement of polymer-based dielectrics with enhanced heat dissipation and energy density. Herein, sandwich-structured epoxy-based multilayer composite have been successfully achieved to explore the influence of morphological state of multiphase on thermal conductivity (TC) and dielectric properties. Dopamine-modified reduced graphene oxide (RGO@PDA) was introduced as 2D nanosheets to enhance the dielectric displacement, while, boron nitride nanosheets (BNNS) were incorporated to improve the TC and preserve low dielectric loss of epoxy-based dielectrics. In addition, poly(vinylidene fluoride) (PVDF) as outer layer was utilized to achieve high dielectric constant simultaneously. The resultant sandwich-structured PVEP-1.5 composite (with the central epoxy/polyetherimide (EP/PEI) layer and the outer PVDF layers) possessed an optimized high dielectric constant <em>ε’</em> of 24.1 and exhibited a maximum TC of 1.22<!-- --> <!-- -->W·m<sup>-1</sup>K<sup>-1</sup>. The <em>ε’</em> was 6 times higher than EP/PEI single layer and 2.4 times higher than PVDF single layer, and the TC enhancement efficiency was up to 330%. The breakdown strength (<em>E</em><sub>b</sub>) and energy storage density (<em>U</em><sub>e</sub>) of PVEP-1.5 reached 176<!-- --> <!-- -->kV·mm<sup>-1</sup> and 1.5<!-- --> <!-- -->J·cm<sup>-3</sup>, respectively, representing a remarkable improvement over the pristine EP/PEI (<em>E</em><sub>b</sub> = 47.3<!-- --> <!-- -->kV·mm<sup>-1</sup> and <em>U</em><sub>e</sub> = 0.044<!-- --> <!-- -->J·cm<sup>-3</sup>). The synergetic effect of multiphase morphology and the selective distribution 2D nanosheets presented great potential for the fabrication of epoxy-based multilayer composites with enhanced energy storage performance and superior heat dissipation property.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"6 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872339","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}
Spin-source/ferromagnet interfaces in spin–orbit torque (SOT) devices play a significant role in efficient spin-current generation, transport and interfacial interactions. In this study, an ultrathin rare-earth Dy layer with a thickness of 0.6 nm was inserted into the Pt/Co interface to explore its impact on SOT-driven magnetization reversal. Anomalous Hall effect measurements reveal an increase of the damping-like SOT efficiency by ~480%, alongside a reduced switching current density of ~6.68×106 A/cm2 in a perpendicularly magnetized Pt/Dy/Co/Ta stack. In particular, a notable increase of the field-like SOT efficiency by ~1000% and the large effective spin Hall angle of ~0.491 reveal the enhanced interfacial Rashba spin–orbit coupling and/or spin transparency by the Dy decoration. More importantly, a field-free SOT reversal was observed, which may originate from the out-of-plane Rashba effective magnetic field owing to the lateral inhomogeneous component distribution between Dy and Co. Furthermore, an enhanced interfacial Dyzaloshinskii-Moriya interaction (DMI) was achieved in the Pt/Dy/Co/Ta stack. Our results demonstrate that interface engineering with an ultrathin rare-earth Dy interlayer can significantly strengthen the interfacial effects, such as interfacial spin–orbit coupling, spin transparency, and DMI, providing a promising approach to manufacturing energy-efficient SOT-based spin memories and racetrack devices.
{"title":"Effect of an ultrathin rare-earth Dy interlayer on the spin-orbit torques and interfacial Dyzaloshinskii-Moriya interaction in perpendicularly magnetized Pt/Dy/Co multilayers","authors":"Dong Li, Minrui Li, Yanping Lai, Xiyue Liu, Jijun Yun, Zhiyong Quan, Xiaohong Xu","doi":"10.1016/j.jallcom.2025.180607","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180607","url":null,"abstract":"Spin-source/ferromagnet interfaces in spin–orbit torque (SOT) devices play a significant role in efficient spin-current generation, transport and interfacial interactions. In this study, an ultrathin rare-earth Dy layer with a thickness of 0.6<!-- --> <!-- -->nm was inserted into the Pt/Co interface to explore its impact on SOT-driven magnetization reversal. Anomalous Hall effect measurements reveal an increase of the damping-like SOT efficiency by ~480%, alongside a reduced switching current density of ~6.68×10<sup>6<!-- --> </sup>A/cm<sup>2</sup> in a perpendicularly magnetized Pt/Dy/Co/Ta stack. In particular, a notable increase of the field-like SOT efficiency by ~1000% and the large effective spin Hall angle of ~0.491 reveal the enhanced interfacial Rashba spin–orbit coupling and/or spin transparency by the Dy decoration. More importantly, a field-free SOT reversal was observed, which may originate from the out-of-plane Rashba effective magnetic field owing to the lateral inhomogeneous component distribution between Dy and Co. Furthermore, an enhanced interfacial Dyzaloshinskii-Moriya interaction (DMI) was achieved in the Pt/Dy/Co/Ta stack. Our results demonstrate that interface engineering with an ultrathin rare-earth Dy interlayer can significantly strengthen the interfacial effects, such as interfacial spin–orbit coupling, spin transparency, and DMI, providing a promising approach to manufacturing energy-efficient SOT-based spin memories and racetrack devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"8 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872341","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 : 2025-04-24DOI: 10.1016/j.jallcom.2025.180509
Zhe Gao , Yao Feng , Jinting Jia
With the development of smart wearable devices in the fields of human-computer interaction, medical diagnosis, health monitoring, etc., smart electronic devices are rapidly developing in the direction of flexibility, miniaturization and comfort. stretchable battery is widely recognized as an ideal stretchable energy storage system. In this work, the latest development trends of stretchable energy storage batteries were analyzed from three aspects: ①preparation schemes of stretchable electrodes and electrolytes, and battery structure design, ②electrochemical performance of batteries under strain and stability during stretching cycles, and ③packaging materials with both stretchability and sealing properties. In addition, the advantages and disadvantages of different strategies for achieving battery stretchability were evaluated from the perspectives of battery equipment stretchability and component stretchability. finally, the current challenges faced by stretchable energy storage batteries were analyzed, and their future development directions were pointed out.
{"title":"Flexible composite materials preparation and structure design for stretchable flexible energy storage battery: Recent progress, challenges and perspective","authors":"Zhe Gao , Yao Feng , Jinting Jia","doi":"10.1016/j.jallcom.2025.180509","DOIUrl":"10.1016/j.jallcom.2025.180509","url":null,"abstract":"<div><div>With the development of smart wearable devices in the fields of human-computer interaction, medical diagnosis, health monitoring, etc., smart electronic devices are rapidly developing in the direction of flexibility, miniaturization and comfort. stretchable battery is widely recognized as an ideal stretchable energy storage system. In this work, the latest development trends of stretchable energy storage batteries were analyzed from three aspects: ①preparation schemes of stretchable electrodes and electrolytes, and battery structure design, ②electrochemical performance of batteries under strain and stability during stretching cycles, and ③packaging materials with both stretchability and sealing properties. In addition, the advantages and disadvantages of different strategies for achieving battery stretchability were evaluated from the perspectives of battery equipment stretchability and component stretchability. finally, the current challenges faced by stretchable energy storage batteries were analyzed, and their future development directions were pointed out.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1027 ","pages":"Article 180509"},"PeriodicalIF":5.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143866213","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}
Soft magnetic materials (SMMs) play a key role in the conversion of electric energy throughout the world. Developing MHz SMMs is a strategy for modern power systems supported by wide bandgap semiconductor devices. However, significant loss above hundreds of kHz in SMMs become a bottleneck for efficient energy conversion. Here, we report an effective approach to achieve a 250 kW/m3 low loss of Fe-Si composites at 3 MHz with 1.5 T saturation magnetization. By decreasing the particle size to 1 μm in a core-shell structure or increasing the particle ratio of diameter/thickness to 100 in a layered structure, low loss particles with mechanism of coherent rotation modulated by the eddy current is formed in dense composites. Study shows that the decrease of loss primary comes from the collaborative decreasing of eddy current and excess loss. This approach opens a way to find MHz efficient SMMs for next-generation high-efficiency power systems.
{"title":"MHz low loss approach of Fe-Si soft magnetic composite","authors":"Xiaowei Jin, Tong Li, Hao Feng, Hongxin Cui, Zhaochen Liu, Zhenlin Jia, Huigang Shi, Desheng Xue","doi":"10.1016/j.jallcom.2025.180610","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180610","url":null,"abstract":"Soft magnetic materials (SMMs) play a key role in the conversion of electric energy throughout the world. Developing MHz SMMs is a strategy for modern power systems supported by wide bandgap semiconductor devices. However, significant loss above hundreds of kHz in SMMs become a bottleneck for efficient energy conversion. Here, we report an effective approach to achieve a 250<!-- --> <!-- -->kW/m<sup>3</sup> low loss of Fe-Si composites at 3<!-- --> <!-- -->MHz with 1.5<!-- --> <!-- -->T saturation magnetization. By decreasing the particle size to 1 μm in a core-shell structure or increasing the particle ratio of diameter/thickness to 100 in a layered structure, low loss particles with mechanism of coherent rotation modulated by the eddy current is formed in dense composites. Study shows that the decrease of loss primary comes from the collaborative decreasing of eddy current and excess loss. This approach opens a way to find MHz efficient SMMs for next-generation high-efficiency power systems.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"140 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872296","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}
Humidity sensors are widely used in food processing, pharmaceuticals, climate control, drying, and creating specific living environments. They operate by selectively adsorbing H₂O molecules, inducing changes in electrical, optical, or mechanical properties to enable precise humidity detection. However, the sensitivity of humidity sensors exhibits apparent shifts under extreme environments, especially drastic temperature changes and intense light irradiation, due to the physical adsorption process of H2O being easily affected. Herein, we fabricated an all-solid humidity sensor with a wide working temperature window by solution-processable large-area gold nanoparticles/black phosphorus (AuNPs-BP) composite thin film. As-fabricated devices exhibit a high sensitivity of up to 2000% under 30°C temperature and 85% relative humidity (RH). During continuous two-week humidity environment testing, the all-solid-state humidity sensor of AuNPs-BP composite thin film nanodevices demonstrate excellent long-term stability. Especially under some harsh conditions, including low temperature (15°C), high temperature (60°C), and intense light irradiation conditions from different wavelengths (532-1550 nm), the sensing performances have been well maintained. Therefore, the fabricated AuNPs-BP composite thin film devices can be applied in outdoor environmental monitoring and optical communication systems.
{"title":"All-solid multi-environmental tolerant humidity sensors based on solution- processable large-area Au nanoparticles /black phosphorus composite thin film","authors":"Yongkai Lu, Ning Wang, Longwei Guo, Shanshan Gao, Xue Yang, Khangale Phathutshedzo, Qingliang Feng, Xinying Liu, Dongli Zhao","doi":"10.1016/j.jallcom.2025.180606","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180606","url":null,"abstract":"Humidity sensors are widely used in food processing, pharmaceuticals, climate control, drying, and creating specific living environments. They operate by selectively adsorbing H₂O molecules, inducing changes in electrical, optical, or mechanical properties to enable precise humidity detection. However, the sensitivity of humidity sensors exhibits apparent shifts under extreme environments, especially drastic temperature changes and intense light irradiation, due to the physical adsorption process of H<sub>2</sub>O being easily affected. Herein, we fabricated an all-solid humidity sensor with a wide working temperature window by solution-processable large-area gold nanoparticles/black phosphorus (AuNPs-BP) composite thin film. As-fabricated devices exhibit a high sensitivity of up to 2000% under 30°C temperature and 85% relative humidity (RH). During continuous two-week humidity environment testing, the all-solid-state humidity sensor of AuNPs-BP composite thin film nanodevices demonstrate excellent long-term stability. Especially under some harsh conditions, including low temperature (15°C), high temperature (60°C), and intense light irradiation conditions from different wavelengths (532-1550<!-- --> <!-- -->nm), the sensing performances have been well maintained. Therefore, the fabricated AuNPs-BP composite thin film devices can be applied in outdoor environmental monitoring and optical communication systems.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"14 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872299","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 : 2025-04-24DOI: 10.1016/j.jallcom.2025.180620
Tao Jiang, Ying Wang, Lixue Xiang, Bo Tang, Shanshan Shi, Chunxia Jiang, Rongbin Li, Yifan Li, Wei Yu, Xinfeng Wu, Wenge Li, Yuantao Zhao, Kai Sun, Runhua Fan, Jinhong Yu
The advancement of highly integrated electronic devices has driven the demand for composites with higher strength and thermal conductivity (TC). Polyacrylonitrile (PAN)-based carbon fibers (CFs) offer high availability, low cost, and excellent mechanical properties, but their thermal conductivity is relatively low. Developing carbon fiber composites with both high thermal conductivity and superior mechanical performance holds significant practical value. In this paper, the carbon/carbon (C/C) with a skeleton structure was prepared using braiding and molding, and the C/C was prepared by pressurized liquid-phase impregnation with high-temperature heat treatment. The results show that when the density of C/C is 1.41 g/cm3, the highest in-plane and through-plane TC can reach 205.87 W/mK and 57.33 W/mK, respectively, and the highest electrical conductivity can up to 882.1 S/cm. The flexural strength of C/C exceeds 100 MPa, and they also show certain friction resistance, with a coefficient of friction of 0.18 at the lowest. Infrared imaging and LED applications show that the prepared C/C have excellent thermal management performance. The above preparation process and the analysis of heat transfer provide some suggestions for the design of C/C thermally conductive composites.
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