Materials Today Physics最新文献_第2页

Bi2X (X = Ge, Sn) monolayers: Promising thermoelectric materials with ultra-low thermal conductivity Bi2X（X = Ge、Sn）单层：具有超低热导率的前景广阔的热电材料

IF 1 2区材料科学

Materials Today Physics Pub Date : 2024-11-14 DOI: 10.1016/j.mtphys.2024.101594

Minghao Lv , Nan Wu , Xiaofeng Fan , Weitao Zheng , David J. Singh

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NiFe pyrophosphate enables long-term alkaline seawater oxidation at an ampere-level current density 焦磷酸镍铁合金可在安培级电流密度下实现长期碱性海水氧化

IF 11.5 2区材料科学

Materials Today Physics Pub Date : 2024-11-13 DOI: 10.1016/j.mtphys.2024.101592

Yujie Yuan, Zixiao Li, Xun He, Hefeng Wang, Hong Tang, Xiaolan Tang, Qiuying Dai, Dongdong Zheng, Shengjun Sun, Yongsong Luo, Mohamed S. Hamdy, Fatma A. Ibrahim, Tingshuai Li, Bo Tang, Xuping Sun

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Grain recovery facilitated low-angle grain boundaries and texture for high-performance BiSbTe alloys 促进低角度晶界和纹理恢复的高性能碲镉铋合金的晶粒恢复

IF 1 2区材料科学

Materials Today Physics Pub Date : 2024-11-13 DOI: 10.1016/j.mtphys.2024.101591

Yuzheng Li , Feng Liu , Boyang Ying , Jiaying Liu , Yuzhou He , Kai Liu , Airan Li , Yongqing Wu , Zefeng Tang , Pengfei Nan , Binghui Ge , Chenguang Fu , Tiejun Zhu

{"title":"Grain recovery facilitated low-angle grain boundaries and texture for high-performance BiSbTe alloys","authors":"Yuzheng Li , Feng Liu , Boyang Ying , Jiaying Liu , Yuzhou He , Kai Liu , Airan Li , Yongqing Wu , Zefeng Tang , Pengfei Nan , Binghui Ge , Chenguang Fu , Tiejun Zhu","doi":"10.1016/j.mtphys.2024.101591","DOIUrl":"10.1016/j.mtphys.2024.101591","url":null,"abstract":"<div><div>Low-angle grain boundaries (LAGBs) bring an effective scattering of phonons while maintaining a weak effect on charge carrier transport, which could be utilized for enhancing the thermoelectric performance of solid materials. In the Bi2Te3-based materials fabricated by hot extrusion (HE) technique, however, the formation of the LAGBs is evitably accompanied by severe recrystallization, resulting in texture loss and hindering further zT improvement. Here, we demonstrate a feasible strategy utilizing the grain recovery to maintain dense LAGBs with high grain orientation by the optimized HE technique. As a result, a low thermal conductivity of about 1 W m−1 K−1 and a high power factor of 4.2 mW m−1 K−2 are achieved at 300 K for p-type Bi0.5Sb1.5Te3 alloys, leading to a high room-temperature zT of 1.3. Further, with a decent flexural strength of 25.3 MPa, a 23-pair TE cooling module with the dice dimensions of 0.63 × 0.63 × 1.00 mm3 is assembled, which exhibits a maximum temperature difference of 87.8 K at a hot-side temperature Th of 350 K. These results highlight the important role of grain-recovery manipulation in simultaneously optimizing the thermal and electrical properties toward high-performance Bi2Te3-based TE materials.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"49 ","pages":"Article 101591"},"PeriodicalIF":10.0,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601167","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}

引用次数: 0

Superconducting memory and trapped magnetic flux in ternary lanthanum polyhydrides 三元镧系多氢化物中的超导记忆和捕获磁通量

IF 11.5 2区材料科学

Materials Today Physics Pub Date : 2024-11-13 DOI: 10.1016/j.mtphys.2024.101595

Dmitrii V. Semenok, Andrey V. Sadakov, Di Zhou, Oleg A. Sobolevskiy, Sven Luther, Toni Helm, Vladimir M. Pudalov, Ivan A. Troyan, Viktor V. Struzhkin

{"title":"Superconducting memory and trapped magnetic flux in ternary lanthanum polyhydrides","authors":"Dmitrii V. Semenok, Andrey V. Sadakov, Di Zhou, Oleg A. Sobolevskiy, Sven Luther, Toni Helm, Vladimir M. Pudalov, Ivan A. Troyan, Viktor V. Struzhkin","doi":"10.1016/j.mtphys.2024.101595","DOIUrl":"https://doi.org/10.1016/j.mtphys.2024.101595","url":null,"abstract":"Superconducting memory is a promising technology for data storage because of its speed, high energy efficiency, non-volatility, and compatibility with quantum computing devices. However, the need for cryogenic temperatures makes superconducting memory an extremely expensive and specialized device. Ternary lanthanum polyhydrides, due to their high critical temperatures of 240-250 K, represent a convenient platform for studying effects associated with superconductivity in disordered granular systems. In this work, we investigate a trapped magnetic flux and memory effects in recently discovered lanthanum-neodymium (La,Nd)H10 and lanthanum-scandium (La,Sc)H12 superhydrides at a pressure of 175-196 GPa. We use a steady magnetic field of a few Tesla (T) and strong pulsed fields up to 68 T to create the trapped flux state in the compressed superhydrides. We find a clockwise hysteresis of magnetoresistance in cerium CeH9-10 and lanthanum-cerium (La,Ce)H10+x polyhydrides, a characteristic feature of granular superconductors. A study of the current-voltage characteristics and voltage-temperature curves of the samples with trapped magnetic flux indicates a significant memory effect in La-Sc polyhydrides already at 225-230 K.","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"5 1","pages":""},"PeriodicalIF":11.5,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601168","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}

引用次数: 0

Impact of an annealing atmosphere on band-alignment of a plasma-enhanced atomic layer deposition-grown Ga2O3/SiC heterojunction 退火气氛对等离子体增强原子层沉积生长的 Ga2O3/SiC 异质结带排列的影响

IF 1 2区材料科学

Materials Today Physics Pub Date : 2024-11-12 DOI: 10.1016/j.mtphys.2024.101593

Yi Shen , An-Feng Wang , Hong-Ping Ma , Xin Qi , Qilong Yuan , Mingyang Yang , Mengting Qiu , Bingxue Zhang , Nan Jiang , Qingchun Jon Zhang

{"title":"Impact of an annealing atmosphere on band-alignment of a plasma-enhanced atomic layer deposition-grown Ga2O3/SiC heterojunction","authors":"Yi Shen , An-Feng Wang , Hong-Ping Ma , Xin Qi , Qilong Yuan , Mingyang Yang , Mengting Qiu , Bingxue Zhang , Nan Jiang , Qingchun Jon Zhang","doi":"10.1016/j.mtphys.2024.101593","DOIUrl":"10.1016/j.mtphys.2024.101593","url":null,"abstract":"<div><div>Gallium oxide (Ga2O3) has attracted much attention because of its notable advantages, including its low cost and a high critical breakdown field. In this study, atomic layer deposition was used to deposit high-quality Ga2O3 onto a SiC substrate with high thermal conductivity. The band arrangement of the Ga2O3/SiC heterojunction was investigated by modulating oxygen vacancies using different post-annealing atmospheres. The results demonstrated that recrystallization of Ga2O3 resulted in a good crystalline state because of the rearrangement of Ga and O atoms following high-temperature annealing. Simultaneously, the roughness of all annealed samples increased. X-ray photoelectron spectroscopy analysis revealed a significant reduction of oxygen vacancy content in samples that were annealed in an oxygen atmosphere; this is attributed to the replacement of oxygen vacancies by oxygen atoms. Conversely, oxygen vacancies increased in an oxygen-free environment. The band offsets (valence band, conduction band) were respectively determined to be (−1.03 eV, 0.5 eV), (−0.63 eV, 0.9 eV), (−1.39 eV, 0.16 eV), and (−1.32 eV, 0.22 eV) for the as-deposited sample and annealed samples with O2, N2, and Ar atmospheres. Finally, the impact that various ratios of oxygen vacancies have on the energy band structure of Ga2O3 was studied using first-principles calculations. Calculations on heterojunctions confirmed that the introduction of oxygen vacancies reduced the potential barrier at the interface and promoted the movement of electrons. Thus, this study provides valuable insights for the design and application of Ga2O3/SiC heterojunction devices.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"49 ","pages":"Article 101593"},"PeriodicalIF":10.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601169","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}

引用次数: 0

Highly stretchable, low-hysteresis, and antifreeze hydrogel for low-grade thermal energy harvesting in ionic thermoelectric Supercapacitors 用于离子热电超级电容器中低级热能收集的高拉伸、低滞后和抗冻水凝胶

IF 1 2区材料科学

Materials Today Physics Pub Date : 2024-11-10 DOI: 10.1016/j.mtphys.2024.101589

Wanyu Qian , Shuanglin Jia , Penglu Yu , Ke Li , Mingxuan Li , Jinle Lan , Yuan-Hua Lin , Xiaoping Yang

{"title":"Highly stretchable, low-hysteresis, and antifreeze hydrogel for low-grade thermal energy harvesting in ionic thermoelectric Supercapacitors","authors":"Wanyu Qian , Shuanglin Jia , Penglu Yu , Ke Li , Mingxuan Li , Jinle Lan , Yuan-Hua Lin , Xiaoping Yang","doi":"10.1016/j.mtphys.2024.101589","DOIUrl":"10.1016/j.mtphys.2024.101589","url":null,"abstract":"<div><div>Efficient harvest of low-grade waste heat in the environment through thermoelectric materials represents a promising strategy to address the current energy crisis. In practical applications, the mechanical properties of thermoelectric materials are crucial for their lifespan and operational environment. In this study, we designed a series of ionic thermoelectric hydrogels, PAM/CMC-xLiCl, with high mechanical properties. These hydrogels are formed by a dual network structure composed of polyacrylamide (PAM) and sodium carboxymethyl cellulose (CMC), with LiCl serving as the conductive material. At room temperature, the optimal Seebeck coefficient and ionic conductivity of the hydrogels can reach 2.96 mV K−1 and 36.51 mS cm−1, respectively. Based on the physical entanglement, hydrogen bonding, and chemical crosslinking of the polymer chains within the ionic hydrogels, which demonstrate outstanding mechanical properties (elongation at break >1300 %, fracture toughness >1700 kJ m−3), maintaining 95 % resilience under a large strain of 400 %. Furthermore, due to the hydration properties of LiCl, the ionic hydrogels exhibit excellent freeze resistance and the capability to absorb moisture for self-regeneration upon drying. Lastly, the fabricated ionic thermoelectric supercapacitor can generate a thermoelectric voltage of 0.182 V under a ΔT of 12 K, with a power density of 6.68 mW m−2, showing promising prospects for application in waste heat harvest fields.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"49 ","pages":"Article 101589"},"PeriodicalIF":10.0,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597001","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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Influence of biaxial and isotropic strain on the thermoelectric performance of PbSnTeSe high-entropy alloy: A density-functional theory study 双轴和各向同性应变对 PbSnTeSe 高熵合金热电性能的影响：密度泛函理论研究

IF 1 2区材料科学

Materials Today Physics Pub Date : 2024-11-08 DOI: 10.1016/j.mtphys.2024.101590

Ming Xia, Pascal Boulet, Marie-Christine Record

{"title":"Influence of biaxial and isotropic strain on the thermoelectric performance of PbSnTeSe high-entropy alloy: A density-functional theory study","authors":"Ming Xia, Pascal Boulet, Marie-Christine Record","doi":"10.1016/j.mtphys.2024.101590","DOIUrl":"10.1016/j.mtphys.2024.101590","url":null,"abstract":"<div><div>Strain engineering is an effective method to improve materials thermoelectric (TE) performance. In this study, both biaxial and isotropic strains ranging from −3% to +3 % and from −3% to −1%, respectively, were applied to improve the TE properties of PbSnTeSe high entropy alloy (HEA). The effects of strain on the TE transport properties of PbSnTeSe HEA were investigated using first-principles calculations combined with Boltzmann transport theory. Under biaxial strain, n-type doped PbSnTeSe HEA shows an increase in the optimal power factor (<math><mrow><mi>P</mi><mi>F</mi></mrow></math>) with both compressive and tensile strains. For p-type doping, compressive strain enhances the <math><mrow><mi>P</mi><mi>F</mi></mrow></math>, whereas tensile strain reduces it. Within a strain range of −3% to +3 %, the optimal <math><mrow><mi>P</mi><mi>F</mi></mrow></math> are 7.8–9.5 mW/mK2 for n-type and 0.85–1.3 mW/mK2 for p-type doped PbSnTeSe HEA. The maximum figure of merit (<math><mrow><mi>Z</mi><mi>T</mi></mrow></math>) value of 1.63 for n-type doped PbSnTeSe HEA at 300 K under 3 % tensile strain is 61 % higher than the <math><mrow><mi>Z</mi><mi>T</mi></mrow></math> value of 1.1 without strain. Under isotropic strain ranging from 0 % to −3%, the <math><mrow><mi>P</mi><mi>F</mi></mrow></math> increases from 7.8 to 14 mW/mK2 for n-type and from 1.1 to 3.4 mW/mK2 for p-type doped PbSnTeSe HEA. Additionally, isotropic strain boosts the maximum <math><mrow><mi>Z</mi><mi>T</mi></mrow></math> value for p-type doped PbSnTeSe HEA at 300 K from 0.3 to 0.85 under −3% strain. This study confirms that strain engineering is an effective strategy to enhance the thermoelectric properties of PbSnTeSe HEA.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"49 ","pages":"Article 101590"},"PeriodicalIF":10.0,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597103","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}

引用次数: 0

Corrigendum to ‘Excellent energy-storage performance in BNT-BT lead-free ceramics through optimized electromechanical breakdown’ [Materials Today Physics 47(2024) 101545] 通过优化机电击穿实现 BNT-BT 无铅陶瓷的卓越储能性能"[《今日物理学材料》47(2024) 101545] 更正

IF 11.5 2区材料科学

Materials Today Physics Pub Date : 2024-11-07 DOI: 10.1016/j.mtphys.2024.101587

Liang Wang, Wenjun Cao, Cen Liang, Changyuan Wang, Hanyu Zhao, Chunchang Wang

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Novel NaNbO3-based, ferroelectric ceramics with excellent polarization and electric potential for antibacterial applications 新型 NaNbO3 基铁电陶瓷具有优异的极化和电势，可用于抗菌应用

IF 1 2区材料科学

Materials Today Physics Pub Date : 2024-11-06 DOI: 10.1016/j.mtphys.2024.101583

Lei Zhang , Yongqiang Yang , Yongping Pu , Min Chen , Ning Xu , Xia Wu

{"title":"Novel NaNbO3-based, ferroelectric ceramics with excellent polarization and electric potential for antibacterial applications","authors":"Lei Zhang , Yongqiang Yang , Yongping Pu , Min Chen , Ning Xu , Xia Wu","doi":"10.1016/j.mtphys.2024.101583","DOIUrl":"10.1016/j.mtphys.2024.101583","url":null,"abstract":"<div><div>Low surface electric potential (<1V) limits the large-scale commercial application of ferroelectric antibacterial ceramics. We propose a strategy based on charge-balancing doping to enhance polarization and potential in NaNbO3(NN)-based ceramics for disinfection application. The Mg2+ modified NN showed a superior bactericidal effect greater than 80 % for 1.5 h and 99.8 % for 3 h without heating or ultrasonication, which is superior to other published works. This is mainly due to its excellent surface electric potential of 1.72 V and defect-related discharge current of 141.9 pA compared to NN and Ca2+ modified NN. Ferroelectric properties demonstrated that NN-Mg possesses a lower EC of ∼40 kV/cm and a higher Pr of ∼32 μC/cm2. Furthermore, the combination of XRD, Raman shift, PFM, and permittivity testing suggests that the smaller domain and enhanced ferroelectric properties in NN-Mg originated from amphoteric doping. Finally, simulation results of the electric field distribution indicated that NN-Mg had a stronger attraction or repulsion to bacteria with negatively charged surfaces.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"49 ","pages":"Article 101583"},"PeriodicalIF":10.0,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142594304","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}

引用次数: 0

Multiple scattering effect of spherical LaPO4 enhanced broadband emissivity for heat dissipation of electronic devices 球形 LaPO4 的多重散射效应增强了电子设备散热的宽带发射率

IF 1 2区材料科学

Materials Today Physics Pub Date : 2024-11-06 DOI: 10.1016/j.mtphys.2024.101584

Chuanqing Sun , Mingrui Liu , Wei Song , Chenxi Bao , Wanting Zhu , Wenyu Zhao , Qingjie Zhang

{"title":"Multiple scattering effect of spherical LaPO4 enhanced broadband emissivity for heat dissipation of electronic devices","authors":"Chuanqing Sun , Mingrui Liu , Wei Song , Chenxi Bao , Wanting Zhu , Wenyu Zhao , Qingjie Zhang","doi":"10.1016/j.mtphys.2024.101584","DOIUrl":"10.1016/j.mtphys.2024.101584","url":null,"abstract":"<div><div>High-performance infrared radiation materials with excellent broadband emissivity, remarkable thermal stability, and scalable fabrication processes play a vital role in heat dissipation and energy-saving applications. However, current strategies of broadband emissivity enhancement remain inadequate. This study investigates the impact of LaPO4 morphology on the infrared radiation properties of composite coating. Three distinct morphologies (sphere, rod and mesh sheet) of LaPO4 are explored using a simulation-aided method. The composite coating filled with large-sized spherical LaPO4 particles with low diffuse reflection, exhibits a significantly enhanced infrared radiation capability, resulting in a broadband emissivity of 95.6 %. Furthermore, the composite coating achieves a large temperature reduction of 6.2 °C and high cooling efficiency of 11.9 % when subjected to a heating power of 2250 W/m2. This work provides an innovative strategy for regulating material emissivity through morphology control, benefiting advancements low-cost radiation heat transfer technology.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"49 ","pages":"Article 101584"},"PeriodicalIF":10.0,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588393","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}

引用次数: 0