Pub Date : 2025-12-27DOI: 10.1016/j.materresbull.2025.113982
D. Batalu , R. Svoboda , G.V. Aldica , V. Sandu , M.A. Grigoroscuta , A.M. Badea , C. Locovei , M. Enculescu , S. Popa , A. Kuncser , P. Badica
Alloys (A) of crystalline Ge50Te50 and partially amorphous Ge20Te80 were added to MgB2 superconductor. Samples with composition (MgB2)A0.01 were ex situ spark plasma sintered (SPS) and characterized. Results are compared with pristine and Te ((MgB2)Te0.01) or Ge, ((MgB2)Ge0.01) added samples. Samples with Ge-Te alloys show the fastest densification rate of 3.4 to 5.2 times larger than for the other samples. Although there is a strong influence of Te, alloys synergistically contribute structural and microstructural development and superconducting properties as determined by magnetometry. The proposed methodology of densification curves analysis allows prediction of the final bulk density, MgO and MgB4 amounts, the amount of carbon substituting boron and critical temperature. The alloys addition promotes MgB4 formation and a slightly lower critical current density Jc for Ge50Te50. For Ge20Te80, Jc is approximately similar to pristine sample, while the highest Jc is for Te. Samples with Ge-Te have lower maximum pinning force values.
{"title":"Enhanced Spark plasma sintering in MgB2 added with Ge-Te alloys","authors":"D. Batalu , R. Svoboda , G.V. Aldica , V. Sandu , M.A. Grigoroscuta , A.M. Badea , C. Locovei , M. Enculescu , S. Popa , A. Kuncser , P. Badica","doi":"10.1016/j.materresbull.2025.113982","DOIUrl":"10.1016/j.materresbull.2025.113982","url":null,"abstract":"<div><div>Alloys (A) of crystalline Ge50Te50 and partially amorphous Ge20Te80 were added to MgB<sub>2</sub> superconductor. Samples with composition (MgB<sub>2</sub>)A<sub>0.01</sub> were <em>ex situ</em> spark plasma sintered (SPS) and characterized. Results are compared with pristine and Te ((MgB<sub>2</sub>)Te<sub>0.01</sub>) or Ge, ((MgB<sub>2</sub>)Ge<sub>0.01</sub>) added samples. Samples with Ge-Te alloys show the fastest densification rate of 3.4 to 5.2 times larger than for the other samples. Although there is a strong influence of Te, alloys synergistically contribute structural and microstructural development and superconducting properties as determined by magnetometry. The proposed methodology of densification curves analysis allows prediction of the final bulk density, MgO and MgB<sub>4</sub> amounts, the amount of carbon substituting boron and critical temperature. The alloys addition promotes MgB<sub>4</sub> formation and a slightly lower critical current density <em>J</em><sub>c</sub> for Ge50Te50. For Ge20Te80, <em>J</em><sub>c</sub> is approximately similar to pristine sample, while the highest <em>J</em><sub>c</sub> is for Te. Samples with Ge-Te have lower maximum pinning force values.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113982"},"PeriodicalIF":5.7,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145939378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-26DOI: 10.1016/j.materresbull.2025.113979
Tian Tian , Xinyu Wang , Xinglin Liu , Wang Liao , De-Yi Wang
The large amount of textiles has caused a serious environmental burden. Creative methods should be proposed to solve the long-standing unresolved problem. Herein, waste polyester-cotton blend (PCB) are converted into robust and flame-resistant composite aerogels under the light of ‘Chemical Reengineering’. The compression modulus of the resulting aerogel is up to 23.9 MPa with corresponding specific modulus of 69.92 m2/s2. The in-situ introduction of magnesium-aluminium layered double hydroxide (MgAl LDH) in PCB gel decreases the peak heat release rate (PHRR) by 91.6% and extends the time to peak heat release (tPHRR) to 115 s. Simultaneously, terephthalic acid (TPA) is effectively recovered with a purity as high as 99.7%. Furthermore, a comprehensive sustainability assessment with 4 rating parameters is promoted to evaluate and compare recent recycling methods.
{"title":"Chemical reengineering of waste polyester-cotton blends with comprehensive sustainability assessment","authors":"Tian Tian , Xinyu Wang , Xinglin Liu , Wang Liao , De-Yi Wang","doi":"10.1016/j.materresbull.2025.113979","DOIUrl":"10.1016/j.materresbull.2025.113979","url":null,"abstract":"<div><div>The large amount of textiles has caused a serious environmental burden. Creative methods should be proposed to solve the long-standing unresolved problem. Herein, waste polyester-cotton blend (PCB) are converted into robust and flame-resistant composite aerogels under the light of ‘Chemical Reengineering’. The compression modulus of the resulting aerogel is up to 23.9 MPa with corresponding specific modulus of 69.92 m<sup>2</sup>/s<sup>2</sup>. The <em>in-situ</em> introduction of magnesium-aluminium layered double hydroxide (MgAl LDH) in PCB gel decreases the peak heat release rate (PHRR) by 91.6% and extends the time to peak heat release (tPHRR) to 115 s. Simultaneously, terephthalic acid (TPA) is effectively recovered with a purity as high as 99.7%. Furthermore, a comprehensive sustainability assessment with 4 rating parameters is promoted to evaluate and compare recent recycling methods.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113979"},"PeriodicalIF":5.7,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145939377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-26DOI: 10.1016/j.materresbull.2025.113981
Yingying Zhang, Xiaowei Li
The rapid development of industrial economies has intensified environmental pollution and energy shortages. In this study, a ternary magnetic S-scheme heterojunction photocatalyst, RGO/NiFe2O4/Bi2WO6, was synthesized via a one-pot solvothermal method. Results show that the incorporation of RGO/NiFe2O4 significantly enhances the material's light absorption capacity and charge separation efficiency. The optimal composite achieved a 94.8% degradation rate of Rhodamine B within 60 min under visible-light irradiation, with a reaction rate 2.4 times that of pure Bi2WO6. The performance improvement is primarily attributed to the synergistic effect of RGO as an electron-conducting network and the S-scheme charge-transfer mechanism between NiFe2O4 and Bi2WO6, which effectively promotes the spatial separation of electron-hole pairs while preserving strong redox potentials. Moreover, the magnetic property of NiFe2O4 enables rapid catalyst recovery, highlighting the design superiority of integrating charge-transfer enhancement with magnetic recyclability in a ternary system.
{"title":"Magnetically reduced graphene oxide-modified NiFe2O4/Bi2WO6 S-scheme photocatalyst for photodegradation of RhB under visible light","authors":"Yingying Zhang, Xiaowei Li","doi":"10.1016/j.materresbull.2025.113981","DOIUrl":"10.1016/j.materresbull.2025.113981","url":null,"abstract":"<div><div>The rapid development of industrial economies has intensified environmental pollution and energy shortages. In this study, a ternary magnetic S-scheme heterojunction photocatalyst, RGO/NiFe<sub>2</sub>O<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub>, was synthesized via a one-pot solvothermal method. Results show that the incorporation of RGO/NiFe<sub>2</sub>O<sub>4</sub> significantly enhances the material's light absorption capacity and charge separation efficiency. The optimal composite achieved a 94.8% degradation rate of Rhodamine B within 60 min under visible-light irradiation, with a reaction rate 2.4 times that of pure Bi<sub>2</sub>WO<sub>6</sub>. The performance improvement is primarily attributed to the synergistic effect of RGO as an electron-conducting network and the S-scheme charge-transfer mechanism between NiFe<sub>2</sub>O<sub>4</sub> and Bi<sub>2</sub>WO<sub>6</sub>, which effectively promotes the spatial separation of electron-hole pairs while preserving strong redox potentials. Moreover, the magnetic property of NiFe<sub>2</sub>O<sub>4</sub> enables rapid catalyst recovery, highlighting the design superiority of integrating charge-transfer enhancement with magnetic recyclability in a ternary system.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113981"},"PeriodicalIF":5.7,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145977527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-26DOI: 10.1016/j.materresbull.2025.113980
Wenhua Zhao , Qimeng Zhang , Quan Gan , Niandu Wu , Zhifang Qiu , Yongchun Ye , Xiaodie Zhao , Zhiqiang Wei , Xiaoling He
Herein, we demonstrate a rational dual-template strategy to construct a hierarchical hollow core-shell heterostructure composed of α-phase cobalt-nickel layered double hydroxide integrated with a conductive reduced graphene oxide matrix (CoNi-LDH/rGO). The ZIF-67 metal-organic framework template directs the formation of a well-defined hollow architecture, while the graphene oxide template, subsequently reduced, simultaneously suppresses structural aggregation and establishes an express electron transport network. This synergistic templating yields a material with an expanded interlayer spacing (0.245 nm), a high specific surface area, and a favorable electronic structure with abundant Ni³⁺ active sites. As an oxygen evolution reaction (OER) electrocatalyst, the optimized CoNi-LDH/rGO achieves an ultralow overpotential of 207 mV at 10 mA cm⁻² and outstanding long-term stability. As a battery-type supercapacitor electrode, it delivers a remarkable specific capacity of 1426.8 C g⁻¹ at 1 A g⁻¹ and excellent cycling durability (92.5% retention after 10,000 cycles).
在此，我们展示了一种合理的双模板策略，构建了由α-相钴-镍层状双氢氧化物与导电还原氧化石墨烯基体（CoNi-LDH/rGO）集成组成的分层中空核壳异质结构。ZIF-67金属有机框架模板指导形成明确的空心结构，而氧化石墨烯模板随后减少，同时抑制结构聚集并建立快速电子传递网络。这种协同模板产生的材料具有扩展的层间距（0.245 nm）、高比表面积和具有丰富Ni³⁺活性位点的有利电子结构。作为析氧反应（OER）电催化剂，优化后的CoNi-LDH/rGO在10 mA cm（⁻²）下具有207 mV的超低过电位，并具有良好的长期稳定性。作为一种电池型超级电容器电极，它提供了1426.8 C g⁻¹的非凡比容量和良好的循环耐久性（10,000次循环后保持92.5%）。
{"title":"Synergistic dual-template engineering of hollow CoNi-LDH/rGO architectures for exceptional bifunctional electrocatalytic and supercapacitor performance","authors":"Wenhua Zhao , Qimeng Zhang , Quan Gan , Niandu Wu , Zhifang Qiu , Yongchun Ye , Xiaodie Zhao , Zhiqiang Wei , Xiaoling He","doi":"10.1016/j.materresbull.2025.113980","DOIUrl":"10.1016/j.materresbull.2025.113980","url":null,"abstract":"<div><div>Herein, we demonstrate a rational dual-template strategy to construct a hierarchical hollow core-shell heterostructure composed of α-phase cobalt-nickel layered double hydroxide integrated with a conductive reduced graphene oxide matrix (CoNi-LDH/rGO). The ZIF-67 metal-organic framework template directs the formation of a well-defined hollow architecture, while the graphene oxide template, subsequently reduced, simultaneously suppresses structural aggregation and establishes an express electron transport network. This synergistic templating yields a material with an expanded interlayer spacing (0.245 nm), a high specific surface area, and a favorable electronic structure with abundant Ni³⁺ active sites. As an oxygen evolution reaction (OER) electrocatalyst, the optimized CoNi-LDH/rGO achieves an ultralow overpotential of 207 mV at 10 mA cm⁻² and outstanding long-term stability. As a battery-type supercapacitor electrode, it delivers a remarkable specific capacity of <strong>1426.8 C g⁻¹</strong> at 1 A g⁻¹ and excellent cycling durability (92.5% retention after 10,000 cycles).</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113980"},"PeriodicalIF":5.7,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-25DOI: 10.1016/j.materresbull.2025.113978
Poting Liu , Anjana Baby , Anna Makarova , Mohammed Adel Aly , Stefan Brackmann , David C. Grinter , Pilar Ferrer , Martin Koch , Vaidas Klimkevičius , Vladimir Sivakov
Multiwavelength light emission was observed in undoped tin oxide thin films deposited by metal-organic chemical vapor deposition at temperatures ranging from 700 °C to 800 °C. This work presents the relationship between the presence and nature of defects in undoped SnO2 thin films and their emission properties. Blue and orange emissions were observed on SnO2 thin films using a He-Cd laser and an Xe lamp at an excitation wavelength of 325 nm, respectively. Systematic characterization and analysis techniques, including low-temperature photoluminescence at temperatures ranging from 77 K to 298 K and surface-sensitive techniques using brilliant synchrotron radiation facilities, were applied to elucidate the features and origin of emission in undoped SnO2 layers. Based on our results, surface and bulk oxygen and interstitial tin defects play an important role in multi-wavelength emission processes and can be separately activated by controlling the applied light source.
{"title":"Multiwavelength light emission of undoped SnO2 layers as a result of defect engineering","authors":"Poting Liu , Anjana Baby , Anna Makarova , Mohammed Adel Aly , Stefan Brackmann , David C. Grinter , Pilar Ferrer , Martin Koch , Vaidas Klimkevičius , Vladimir Sivakov","doi":"10.1016/j.materresbull.2025.113978","DOIUrl":"10.1016/j.materresbull.2025.113978","url":null,"abstract":"<div><div>Multiwavelength light emission was observed in undoped tin oxide thin films deposited by metal-organic chemical vapor deposition at temperatures ranging from 700 °C to 800 °C. This work presents the relationship between the presence and nature of defects in undoped SnO<sub>2</sub> thin films and their emission properties. Blue and orange emissions were observed on SnO<sub>2</sub> thin films using a He-Cd laser and an Xe lamp at an excitation wavelength of 325 nm, respectively. Systematic characterization and analysis techniques, including low-temperature photoluminescence at temperatures ranging from 77 K to 298 K and surface-sensitive techniques using brilliant synchrotron radiation facilities, were applied to elucidate the features and origin of emission in undoped SnO<sub>2</sub> layers. Based on our results, surface and bulk oxygen and interstitial tin defects play an important role in multi-wavelength emission processes and can be separately activated by controlling the applied light source.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113978"},"PeriodicalIF":5.7,"publicationDate":"2025-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145939282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-24DOI: 10.1016/j.materresbull.2025.113976
Deniz Koçyiğit-Kaplan , Melis Gökçe , Aytaç Gürhan Gökçe
Recent advances in photonic technologies have become integral to modern life, with applications in light emitting diodes, lasers and displays, all requiring highly efficient luminescent materials. To meet this requirement DyF3 doped oxyfluoride borogermanate glasses were fabricated by the melt-quenching technique to investigate the effect of alkaline earth fluorides such as BaF2, SrF2 and CaF2. The density, molar volume, refractive index, critical distance and polaron radius all follow the same increasing trend in CaF2<SrF2<BaF2. FT-IR analysis revealed that the CaF2 doped glass network exhibits a more compact structure due to the higher concentration of [BO4] units. The ligand field around the Dy3+ ions and the ionic nature of the glass network were verified by estimating bonding parameters. The Judd-Ofelt intensity parameters indicate a stronger Dy-O covalency and lower asymmetry in the CaF2 doped (BGA-Ca) sample than in the other samples. For the 4F9/2→6H13/2 transition, the BGA-Ca glass exhibits the highest values of branching ratio, stimulated emission cross-section and optical gain bandwidth among all the glasses investigated. The decay time values of the 4F9/2 level were found by fitting a single exponential curve. The chromaticity coordinates of oxyfluoride borogermanate glasses are centered near the white light region and the color correlated temperature and color purity values are in the neutral white light region. Among all glasses, BGA-Ca glass has the highest color purity value (42%). The results demonstrate the usability of all studied glasses in photonic applications such as laser action and white light generation.
{"title":"Exploring the influence of alkaline earth fluorides on the structural and spectroscopic properties of Dy3+ doped oxyfluoride borogermanate glasses for photonic applications","authors":"Deniz Koçyiğit-Kaplan , Melis Gökçe , Aytaç Gürhan Gökçe","doi":"10.1016/j.materresbull.2025.113976","DOIUrl":"10.1016/j.materresbull.2025.113976","url":null,"abstract":"<div><div>Recent advances in photonic technologies have become integral to modern life, with applications in light emitting diodes, lasers and displays, all requiring highly efficient luminescent materials. To meet this requirement DyF<sub>3</sub> doped oxyfluoride borogermanate glasses were fabricated by the melt-quenching technique to investigate the effect of alkaline earth fluorides such as BaF<sub>2</sub>, SrF<sub>2</sub> and CaF<sub>2</sub>. The density, molar volume, refractive index, critical distance and polaron radius all follow the same increasing trend in CaF<sub>2</sub><SrF<sub>2</sub><BaF<sub>2</sub>. FT-IR analysis revealed that the CaF<sub>2</sub> doped glass network exhibits a more compact structure due to the higher concentration of [BO<sub>4</sub>] units. The ligand field around the Dy<sup>3+</sup> ions and the ionic nature of the glass network were verified by estimating bonding parameters. The Judd-Ofelt intensity parameters indicate a stronger Dy-O covalency and lower asymmetry in the CaF<sub>2</sub> doped (BGA-Ca) sample than in the other samples. For the <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>13/2</sub> transition, the BGA-Ca glass exhibits the highest values of branching ratio, stimulated emission cross-section and optical gain bandwidth among all the glasses investigated. The decay time values of the <sup>4</sup>F<sub>9/2</sub> level were found by fitting a single exponential curve. The chromaticity coordinates of oxyfluoride borogermanate glasses are centered near the white light region and the color correlated temperature and color purity values are in the neutral white light region. Among all glasses, BGA-Ca glass has the highest color purity value (42%). The results demonstrate the usability of all studied glasses in photonic applications such as laser action and white light generation.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113976"},"PeriodicalIF":5.7,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-24DOI: 10.1016/j.materresbull.2025.113977
Junwei Ma , Zheng Peng , Longjiang Deng , Wei Yan , Wu Wang , Yang Zhou , Peiheng Zhou , Jun Qin , Lei Bi
Flexible Vanadium dioxide (VO2) metasurfaces shows broad potential for thermal radiation control applications, such as adaptive camouflage and thermal management. However, conventional flexible transfer methods based on chemical etching and mechanical exfoliation suffer from structural damage and film erosion, leading to compromised thermal radiation modulation performance. To address these limitations, this study proposes a surface-energy-assisted transfer method utilizing hydrophobic-hydrophilic contrast and the van der Waals interface between MoS2 and SiO2. This approach enables damage-free separation of VO2 films from rigid substrates using only water, eliminating the attackes from chemical etchants and mechanical force. Using this method, we successfully transferred the centimeter-scale VO2 films and metasurfaces onto flexible substrates. The measured mid-infrared emissivity (8–14 μm) of the flexible VO2 films changes from 0.91 to 0.34 during the phase transition, demonstrating a negative differential thermal emission characteristic. Furthermore, we fabricated a flexible VO2 metasurface exhibiting positive differential thermal emission achieving an emittance of 0.13 at low temperature and 0.58 at high temperature. This research provides a valuable transfer method for fabricating intelligent flexible devices.
{"title":"Surface-Energy-Assisted transfer of flexible VO2 metasurface for multifunctional thermal radiation control","authors":"Junwei Ma , Zheng Peng , Longjiang Deng , Wei Yan , Wu Wang , Yang Zhou , Peiheng Zhou , Jun Qin , Lei Bi","doi":"10.1016/j.materresbull.2025.113977","DOIUrl":"10.1016/j.materresbull.2025.113977","url":null,"abstract":"<div><div>Flexible Vanadium dioxide (VO<sub>2</sub>) metasurfaces shows broad potential for thermal radiation control applications, such as adaptive camouflage and thermal management. However, conventional flexible transfer methods based on chemical etching and mechanical exfoliation suffer from structural damage and film erosion, leading to compromised thermal radiation modulation performance. To address these limitations, this study proposes a surface-energy-assisted transfer method utilizing hydrophobic-hydrophilic contrast and the van der Waals interface between MoS<sub>2</sub> and SiO<sub>2</sub>. This approach enables damage-free separation of VO<sub>2</sub> films from rigid substrates using only water, eliminating the attackes from chemical etchants and mechanical force. Using this method, we successfully transferred the centimeter-scale VO<sub>2</sub> films and metasurfaces onto flexible substrates. The measured mid-infrared emissivity (8–14 μm) of the flexible VO<sub>2</sub> films changes from 0.91 to 0.34 during the phase transition, demonstrating a negative differential thermal emission characteristic. Furthermore, we fabricated a flexible VO<sub>2</sub> metasurface exhibiting positive differential thermal emission achieving an emittance of 0.13 at low temperature and 0.58 at high temperature. This research provides a valuable transfer method for fabricating intelligent flexible devices.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113977"},"PeriodicalIF":5.7,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-23DOI: 10.1016/j.materresbull.2025.113974
M.I. Sayyed , Shrikant Biradar , Mohamed Y. Hanfi , S. Yasmin
In this study, borate-based glasses of formula (85-x-y)B2O3–15BaO-xPbO2-yLa2O3 (x = 20–29 mol%, y = 0.5–2 mol%) were synthesized via melt-quenching to evaluate their physical, mechanical, optical, and radiation shielding properties. Increasing PbO2 and La2O3 content raised glass density and molar volume. Young’s modulus and hardness (82.769–68.925 GPa, 4.379–3.865 GPa) decreased, indicating reduced rigidity. The direct and indirect band gaps declined (3.120–2.960 eV, 2.736–2.549 eV), while Urbach energy and refractive index increased, suggesting greater disorder and polarizability. Radiation shielding improved with increased PbO2 and La2O3: HVL at 0.662 MeV dropped from 1.26 to 1.06 cm, effective atomic number rose to 31 at 0.284 MeV, and mean free path decreased to 2.3 cm. Shielding efficiency peaked at ∼48% (0.284 MeV) and transmission reached ∼95% (1.33 MeV). These glasses exhibited 43% lower HVL than other heavy metal oxide glasses, indicating strong potential for medical and nuclear use with balanced optical and shielding properties.
{"title":"Physical, mechanical, optical, and radiation shielding properties of PbO2 and La2O3 Co-Doped Borate-based Glasses: A unified approach to enhanced opto-shielding performance","authors":"M.I. Sayyed , Shrikant Biradar , Mohamed Y. Hanfi , S. Yasmin","doi":"10.1016/j.materresbull.2025.113974","DOIUrl":"10.1016/j.materresbull.2025.113974","url":null,"abstract":"<div><div>In this study, borate-based glasses of formula (85-x-y)B<sub>2</sub>O<sub>3</sub>–15BaO-xPbO<sub>2</sub>-yLa<sub>2</sub>O<sub>3</sub> (<em>x</em> = 20–29 mol%, <em>y</em> = 0.5–2 mol%) were synthesized via melt-quenching to evaluate their physical, mechanical, optical, and radiation shielding properties. Increasing PbO<sub>2</sub> and La<sub>2</sub>O<sub>3</sub> content raised glass density and molar volume. Young’s modulus and hardness (82.769–68.925 GPa, 4.379–3.865 GPa) decreased, indicating reduced rigidity. The direct and indirect band gaps declined (3.120–2.960 eV, 2.736–2.549 eV), while Urbach energy and refractive index increased, suggesting greater disorder and polarizability. Radiation shielding improved with increased PbO<sub>2</sub> and La<sub>2</sub>O<sub>3</sub>: HVL at 0.662 MeV dropped from 1.26 to 1.06 cm, effective atomic number rose to 31 at 0.284 MeV, and mean free path decreased to 2.3 cm. Shielding efficiency peaked at ∼48% (0.284 MeV) and transmission reached ∼95% (1.33 MeV). These glasses exhibited 43% lower HVL than other heavy metal oxide glasses, indicating strong potential for medical and nuclear use with balanced optical and shielding properties.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113974"},"PeriodicalIF":5.7,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-23DOI: 10.1016/j.materresbull.2025.113975
Xiaopeng Miao , Fanshi Meng , Xinxin Xu , Jiahui Wang , Xinyu Wang , Jian Tian
CuNi alloy nanoparticles loaded on nitrogen-doped carbon nanotubes (CuNi@NC) were synthesized by using a Cu-Ni binary metal MOF as the precursor and adding melamine as an additional nitrogen source through high-temperature pyrolysis. At -1.0 V vs. RHE, the Faraday efficiency (FE) of CO produced by CuNi@NC reaches 95.5%, which is much higher than that of Cu@NC(FECO: 14.0%) and Ni@NC(FECO: 37.0%). In-situ infrared spectra shows that the excellent ECO2RR property of CuNi@NC is attributed to the reconfiguration of the electronic structure of the binary alloy catalyst, which increases the adsorption energy for CO2 and promotes the desorption of *CO. This study explores and expands new paths for the synthesis of alloy catalysts.
以Cu-Ni二元金属MOF为前驱体，添加三聚氰胺作为附加氮源，通过高温热解制备了氮掺杂碳纳米管（CuNi@NC）上的CuNi合金纳米颗粒。在-1.0 V vs. RHE下，CuNi@NC产CO的法拉第效率（FE）达到95.5%，远高于Cu@NC（FECO: 14.0%）和Ni@NC（FECO: 37.0%）。原位红外光谱分析表明，CuNi@NC优异的ECO2RR性能是由于二元合金催化剂的电子结构重构，提高了对CO2的吸附能，促进了*CO的解吸。本研究为合金催化剂的合成开辟了新的途径。
{"title":"MOF-derived nitrogen-doped carbon nanotubes supported CuNi alloy for electrocatalytic reduction of CO2 to CO","authors":"Xiaopeng Miao , Fanshi Meng , Xinxin Xu , Jiahui Wang , Xinyu Wang , Jian Tian","doi":"10.1016/j.materresbull.2025.113975","DOIUrl":"10.1016/j.materresbull.2025.113975","url":null,"abstract":"<div><div>CuNi alloy nanoparticles loaded on nitrogen-doped carbon nanotubes (CuNi@N<img>C) were synthesized by using a Cu-Ni binary metal MOF as the precursor and adding melamine as an additional nitrogen source through high-temperature pyrolysis. At -1.0 V <em>vs.</em> RHE, the Faraday efficiency (FE) of CO produced by CuNi@N<img>C reaches 95.5%, which is much higher than that of Cu@N<img>C(FE<sub>CO</sub>: 14.0%) and Ni@N<img>C(FE<sub>CO</sub>: 37.0%). <em>In-situ</em> infrared spectra shows that the excellent ECO<sub>2</sub>RR property of CuNi@N<img>C is attributed to the reconfiguration of the electronic structure of the binary alloy catalyst, which increases the adsorption energy for CO<sub>2</sub> and promotes the desorption of *CO. This study explores and expands new paths for the synthesis of alloy catalysts.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113975"},"PeriodicalIF":5.7,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-12-22DOI: 10.1016/j.materresbull.2025.113971
Babiker M Jaffar , Vinod Kumar , R.E. Kroon , Rudolph M. Erasmus , Odireleng Martin Ntwaeaborwa
Enhanced blue photoluminescence was observed from La4-xGa2O9:Bix powder phosphors prepared using a sol-gel combustion procedure with citric acid serving as the fuel. The doping concentration of Bi3+ was varied according to x = 0, 0.001, 0.005, 0.01, 0.015, 0.02, 0.025, and 0.03 and the materials were heated between 800 to 1400°C in air in increments of 100°C. X-ray diffraction analysis verified that the La4Ga2O9 phosphors crystallized in a single monoclinic phase, suggesting that smaller concentrations of Bi3+ ions substituted La3+ without altering the main structure, a phenomenon attributed to their similar ionic radii. Diffuse reflectance spectroscopy indicated four absorption bands. Those located at 257 and 321 nm were assigned to transitions of Bi3+ ions, the band at 285 nm was due to defect states in Bi clusters, and the band near 230 nm was attributed to absorption above the band gap. The La4Ga2O9 bandgap was determined from the reflectance data to be 5.16 eV. Under 321 nm excitation, a broad blue fluorescence was observed at 455 nm. The emission intensity varied with Bi³⁺ concentration with a maximum for the sample having x = 0.02. For this sample the internal and external quantum yields were 95% and 27%, respectively, suggesting potential for applications in the lighting industry.
{"title":"Role of annealing temperature and Bi3+ doping concentration on the photoluminescence properties of La4Ga2O9 phosphor for high quantum yield","authors":"Babiker M Jaffar , Vinod Kumar , R.E. Kroon , Rudolph M. Erasmus , Odireleng Martin Ntwaeaborwa","doi":"10.1016/j.materresbull.2025.113971","DOIUrl":"10.1016/j.materresbull.2025.113971","url":null,"abstract":"<div><div>Enhanced blue photoluminescence was observed from La<sub>4-x</sub>Ga<sub>2</sub>O<sub>9</sub>:Bi<sub>x</sub> powder phosphors prepared using a sol-gel combustion procedure with citric acid serving as the fuel. The doping concentration of Bi<sup>3+</sup> was varied according to x = 0, 0.001, 0.005, 0.01, 0.015, 0.02, 0.025, and 0.03 and the materials were heated between 800 to 1400°C in air in increments of 100°C. X-ray diffraction analysis verified that the La<sub>4</sub>Ga<sub>2</sub>O<sub>9</sub> phosphors crystallized in a single monoclinic phase, suggesting that smaller concentrations of Bi<sup>3+</sup> ions substituted La<sup>3+</sup> without altering the main structure, a phenomenon attributed to their similar ionic radii. Diffuse reflectance spectroscopy indicated four absorption bands. Those located at 257 and 321 nm were assigned to transitions of Bi<sup>3+</sup> ions, the band at 285 nm was due to defect states in Bi clusters, and the band near 230 nm was attributed to absorption above the band gap. The La<sub>4</sub>Ga<sub>2</sub>O<sub>9</sub> bandgap was determined from the reflectance data to be 5.16 eV. Under 321 nm excitation, a broad blue fluorescence was observed at 455 nm. The emission intensity varied with Bi³⁺ concentration with a maximum for the sample having x = 0.02. For this sample the internal and external quantum yields were 95% and 27%, respectively, suggesting potential for applications in the lighting industry.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"197 ","pages":"Article 113971"},"PeriodicalIF":5.7,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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