Microstructures最新文献_第4页

Pressure-induced superconductivity in hypercoordinated 5p-block element nitrides MN6 (M = Sb, Te, I) 超配位 5p 块元素氮化物 MN6（M = Sb、Te、I）的压力诱导超导性

Microstructures Pub Date : 2024-03-27 DOI: 10.20517/microstructures.2023.91

Yan Liu, Da Li, Tian Cui

{"title":"Pressure-induced superconductivity in hypercoordinated 5p-block element nitrides MN6 (M = Sb, Te, I)","authors":"Yan Liu, Da Li, Tian Cui","doi":"10.20517/microstructures.2023.91","DOIUrl":"https://doi.org/10.20517/microstructures.2023.91","url":null,"abstract":"The recent studies of high-pressure synthesis and stabilization of a variety of polynitrogens have had an immense impact on nitrogen chemistry. However, the metallization and superconductivity of solid nitrogen at high pressure have not yet been verified. Here, based on first-principles calculations, we report a remarkable finding of the metallic N6 hexazine ring stabilized in the 5p -block element nitrides MN6 (M = Sb, Te, I) at an experimentally accessible pressure of 100 GPa. Strikingly, the 5p -block elements act as precompressors and electron donors for the N sublattice, leading to the Jahn-Teller distortion of the N6 hexazine ring and endowing the 5p -block element nitrides superconductivity with a high superconducting critical temperature (T c) of up to 36.8 K, close to the McMillan limit (40 K). This is the first discovery of a nitrogen-based superconductor with distorted N6 hexazine rings. The high T c is attributed to the strong electron-phonon coupling that is induced by the phonon softening and the hybridized electronic states between N and 5s and 5p orbitals of 5p -block elements. Our works have broad implications for enriching novel p -block element nitrides and nitrogen chemistry under extreme conditions.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"27 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140373935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pressure-induced superconductivity in SnSb2Te4 SnSb2Te4 中的压力诱导超导性

Microstructures Pub Date : 2024-02-27 DOI: 10.20517/microstructures.2023.60

Yanmei Ma, Hongbo Wang, Ruihong Li, Han Liu, Jian Zhang, Xianyu Wang, Q. Jing, Xu Wang, Wenping Dong, Jinman Chen, Bingze Wu, Yonghao Han, Dan Zhou, Chunxiao Gao

{"title":"Pressure-induced superconductivity in SnSb2Te4","authors":"Yanmei Ma, Hongbo Wang, Ruihong Li, Han Liu, Jian Zhang, Xianyu Wang, Q. Jing, Xu Wang, Wenping Dong, Jinman Chen, Bingze Wu, Yonghao Han, Dan Zhou, Chunxiao Gao","doi":"10.20517/microstructures.2023.60","DOIUrl":"https://doi.org/10.20517/microstructures.2023.60","url":null,"abstract":"Owing to their unique compositional and structural characteristics, layered van der Waals solids in binary and ternary chalcogenide families provide a fertile testbed for exploring novel exotic structures and states, e.g., topological insulators and superconductors. Herein, a comprehensive study on the structural variations and correlated electrical transport behavior of SnSb2Te4, a ternary member, has been carried out considering elevated pressures. Under 45.6 GPa, three distinct structural phase transitions have been observed, with strong evidence from the variations of high-pressure X-ray diffraction patterns. The onsets of phase II (monoclinic, C2/m ) at 6.3 GPa, phase III (monoclinic, C2/c ) at 15.5 GPa, and phase IV (body-centered cubic with substitutional disorder, Im-3m ) at 17.2 GPa have been observed owing to the emergence of new diffractions. Based on electrical measurements at low temperature and high pressure conditions, two pressure-induced superconducting states have been distinguished in SnSb2Te4. The first state occurs in the range of 12.3-17.1 GPa. The positive pressure dependence on Tc indicates that the aforementioned state is related to the monoclinic C2/m phase. At > 17.1 GPa, the second superconducting state emerges, with the negative pressure dependence on Tc . It relates to the body-centered cubic solid solution phase, which is characteristic of a substitutional disordered crystal structure. The discovery that the pressure-induced superconductivity in SnSb2Te4 is affected by structural phase transitions under pressure may help understand the universal relationship between the ambient condition topological insulating state and derived superconductivity. Ab initio theoretical calculations reveal that an electronic topological transition takes place at approximately 2.0 GPa, which is featured by the obvious changes in the distribution of electronic density of states near the Fermi level.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"6 6‐7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140424757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

La(Fe,Si/Al)13-based materials with exceptional magnetic functionalities: a review 具有特殊磁性功能的 La(Fe,Si/Al)13 基材料：综述

Microstructures Pub Date : 2024-02-26 DOI: 10.20517/microstructures.2023.58

Feixiang Long, Yuzhu Song, Jun Chen

{"title":"La(Fe,Si/Al)13-based materials with exceptional magnetic functionalities: a review","authors":"Feixiang Long, Yuzhu Song, Jun Chen","doi":"10.20517/microstructures.2023.58","DOIUrl":"https://doi.org/10.20517/microstructures.2023.58","url":null,"abstract":"The field of magnetic functional materials continues to garner significant attention due to its research and diverse applications, such as magnetic storage and spintronics. Among these, La(Fe,Si/Al)13-based materials exhibit abundant magnetic properties and emerge as highly captivating subjects with immense potential. This review provides an overview of the diverse magnetic structures and itinerant electron metamagnetic transition observed in La(Fe,Si/Al)13-based materials. The transformation of different magnetic configurations elicits the phenomena such as negative thermal expansion, magnetostriction, magnetocaloric effect, and barocaloric effect. In addition, the pivotal role of spin and lattice coupling in these phenomena is revealed. The magnetic functionalities of La(Fe,Si/Al)13-based materials can be controlled through adjustments of magnetic exchange interactions. Key methods, including chemical substitution, external field application, and interstitial atom insertion, enable precise modulation of these functionalities. This review not only provides valuable insights into the design and development of magnetic functional materials but also offers significant contributions to our understanding of the underlying mechanisms governing their magnetic behaviors.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"53 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140430816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Amorphous diamond embedded in dense boron nitride with excellent mechanical properties 嵌入致密氮化硼的无定形金刚石具有卓越的机械性能

Microstructures Pub Date : 2024-02-06 DOI: 10.20517/microstructures.2023.54

Junkai Li, Guoliang Niu, Peiyang Mu, Bingmin Yan, Fuyang Liu, Shijing Zhao, Leiming Fang, Huiyang Gou

{"title":"Amorphous diamond embedded in dense boron nitride with excellent mechanical properties","authors":"Junkai Li, Guoliang Niu, Peiyang Mu, Bingmin Yan, Fuyang Liu, Shijing Zhao, Leiming Fang, Huiyang Gou","doi":"10.20517/microstructures.2023.54","DOIUrl":"https://doi.org/10.20517/microstructures.2023.54","url":null,"abstract":"Diamond and cubic boron nitride (BN) are important materials with a variety of technological and industrial applications; however, overcoming the intrinsic brittleness of these materials is still a challenge. Here, we synthesize a compound of crystalline BN and amorphous diamond-like carbon through BN nanotubes and fullerene under high pressure and high temperature conditions. The obtained composite exhibits excellent combination of a measured Vickers’ hardness of 86.2 GPa and fracture toughness of 10.2 MPa m1/2. Morphological and structural characterizations reveal that the amorphous diamond-like carbon is homogeneously embedded in a matrix of dense BN. The formation of the amorphous diamond-like carbon particles within the polycrystalline BN can effectively impede the migration of crack tips when the compound is subjected to the plastic deformation, in which most of crack tips are forced to deflect or confined near the boundaries of dense BN and amorphous diamond particles. The crystalline-amorphous composite strengthening presented here may provide a promising strategy for the further improvement of mechanical properties of hard or superhard materials.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"36 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139800561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Amorphous diamond embedded in dense boron nitride with excellent mechanical properties 嵌入致密氮化硼的无定形金刚石具有卓越的机械性能

Microstructures Pub Date : 2024-02-06 DOI: 10.20517/microstructures.2023.54

Junkai Li, Guoliang Niu, Peiyang Mu, Bingmin Yan, Fuyang Liu, Shijing Zhao, Leiming Fang, Huiyang Gou

{"title":"Amorphous diamond embedded in dense boron nitride with excellent mechanical properties","authors":"Junkai Li, Guoliang Niu, Peiyang Mu, Bingmin Yan, Fuyang Liu, Shijing Zhao, Leiming Fang, Huiyang Gou","doi":"10.20517/microstructures.2023.54","DOIUrl":"https://doi.org/10.20517/microstructures.2023.54","url":null,"abstract":"Diamond and cubic boron nitride (BN) are important materials with a variety of technological and industrial applications; however, overcoming the intrinsic brittleness of these materials is still a challenge. Here, we synthesize a compound of crystalline BN and amorphous diamond-like carbon through BN nanotubes and fullerene under high pressure and high temperature conditions. The obtained composite exhibits excellent combination of a measured Vickers’ hardness of 86.2 GPa and fracture toughness of 10.2 MPa m1/2. Morphological and structural characterizations reveal that the amorphous diamond-like carbon is homogeneously embedded in a matrix of dense BN. The formation of the amorphous diamond-like carbon particles within the polycrystalline BN can effectively impede the migration of crack tips when the compound is subjected to the plastic deformation, in which most of crack tips are forced to deflect or confined near the boundaries of dense BN and amorphous diamond particles. The crystalline-amorphous composite strengthening presented here may provide a promising strategy for the further improvement of mechanical properties of hard or superhard materials.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"438 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139860714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Roadmap for ferroelectric domain wall memory 铁电畴壁存储器路线图

Microstructures Pub Date : 2024-01-12 DOI: 10.20517/microstructures.2023.52

Jie Sun, Yiming Li, Di Hu, Bowen Shen, Boyang Zhang, Zilong Wang, Haiyue Tang, Anquan Jiang

引用次数: 0

Misfit strain-misfit strain phase diagram of (110)-oriented ferroelectric PbTiO3 films: a phase-field study (110)取向铁电 PbTiO3 薄膜的错位应变-错位应变相图：相场研究

Microstructures Pub Date : 2024-01-09 DOI: 10.20517/microstructures.2023.53

Hui-Mei Li, Heng Zhang, Yujia Wang, Yunlong Tang, Yiniei Zhu, Xiu-Liang Ma

引用次数: 0

Construction and ultrasonic inspection of the high-capacity Li-ion battery based on the MnO2 decorated by Au nanoparticles anode 基于金纳米粒子装饰的二氧化锰正极的高容量锂离子电池的构造和超声波检测

Microstructures Pub Date : 2024-01-08 DOI: 10.20517/microstructures.2023.64

Cuihua An, Shikang Wang, Liyang Lin, Xiangyan Ding, Qibo Deng, Ning Hu

{"title":"Construction and ultrasonic inspection of the high-capacity Li-ion battery based on the MnO2 decorated by Au nanoparticles anode","authors":"Cuihua An, Shikang Wang, Liyang Lin, Xiangyan Ding, Qibo Deng, Ning Hu","doi":"10.20517/microstructures.2023.64","DOIUrl":"https://doi.org/10.20517/microstructures.2023.64","url":null,"abstract":"Lithium (Li)-ion batteries have become one of the main energy sources for electric vehicles and energy storage systems, which puts forward higher requirements for the detection of battery state of health (SOH). The SOH of batteries is crucial for areas such as battery management and renewable energy storage. Accurately evaluating the SOH of batteries can optimize charging and discharging strategies and extend battery life. Therefore, accurately and effectively monitoring the SOH of Li batteries is of great significance. An ultrasonic testing technology has been proposed that can non-destructively test the Li battery SOH, enabling accurate judgment of batteries in poor or damaged conditions. Firstly, the hetero-structured MnO2-Au has been constructed as the anode for Li-ion batteries. MnO2-Au heterojunction enhances electronic conductivity and ion conductivity. The MnO2-Au has exhibited high specific capacity and superior rate performances, which can well satisfy the ultrasonic inspection of the battery. Then, the ultrasonic testing has been conducted on batteries with different ages. The results suggest that batteries with short circuits have the highest nonlinear coefficient, while batteries with short circuits after long cycles have the lowest nonlinear coefficient. The nonlinear coefficient of batteries with different charging and discharging states is in the middle.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"37 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139446289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photothermal effect and application of photothermal materials in photocatalysis and photoelectric catalysis 光热效应和光热材料在光催化和光电催化中的应用

Microstructures Pub Date : 2024-01-01 DOI: 10.20517/microstructures.2023.51

Jingnan Zhang, Tong-Dan. Tang, Rongge Yang, Guilin Wang, Kai-Hang Ye, Jianxin Shi

{"title":"Photothermal effect and application of photothermal materials in photocatalysis and photoelectric catalysis","authors":"Jingnan Zhang, Tong-Dan. Tang, Rongge Yang, Guilin Wang, Kai-Hang Ye, Jianxin Shi","doi":"10.20517/microstructures.2023.51","DOIUrl":"https://doi.org/10.20517/microstructures.2023.51","url":null,"abstract":"Photocatalysis (PC) and photoelectric catalysis (PEC) are environmental protection technologies that use sunlight capacity and environmental governance, and they have a wide range of applications in hydrogen production, carbon dioxide reduction, organic degradation, and other fields. When the light is irradiated on the material, part of the light energy will be converted into heat energy, and the combination of this part of the heat energy with PC and PEC will become an important way to improve optical performance. Compared with traditional technology, the synergistic effect of light and heat can obtain higher catalytic performance and improve energy utilization efficiency. This review begins with an overview of the principle of photoheat generation, which produces heat energy in a non-radiative process through photo-induced instability of electrons. The principle of thermal effect on the performance improvement of PC/PEC is analyzed from the dynamics and thermodynamics of photoreaction and electric reaction. On this basis, several materials widely used at present are listed, such as oxides, plasmas, conductive polymers, carbon materials, and other typical photothermal materials. The specific applications of photothermal materials in PC and PEC processes, such as hydrogen production by oxidation, carbon dioxide reduction, organic matter reduction, and seawater desalination, were discussed. Finally, the challenges to PC/PEC from the introduction of thermal effects are further discussed to provide a clean and sustainable way to build a carbon-neutral society.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"25 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140522306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Topological transformation of magnetic hopfion in confined geometries 约束几何中磁跳子的拓扑变换

Microstructures Pub Date : 2024-01-01 DOI: 10.20517/microstructures.2023.69

Yang Gao, Shuang Li, Yuelei Zhao, Zhaozhao Zhu, Linyu Cao, Jiawang Xu, Yan Zhou, Shouguo Wang

{"title":"Topological transformation of magnetic hopfion in confined geometries","authors":"Yang Gao, Shuang Li, Yuelei Zhao, Zhaozhao Zhu, Linyu Cao, Jiawang Xu, Yan Zhou, Shouguo Wang","doi":"10.20517/microstructures.2023.69","DOIUrl":"https://doi.org/10.20517/microstructures.2023.69","url":null,"abstract":"Three-dimensional (3D) topological magnetic structures have attracted enormous interest due to their exceptional spatial structures and intriguing physics. Hopfions, characterized by the Hopf index, are 3D spin textures that emerged as closed twisted skyrmion strings. A comprehensive understanding of magnetic structural transitions within nanostructures is crucial for their applications in spintronics devices. Despite the demonstration of stabilization and current-driven dynamics of hopfion, their behavior in geometric confinement has remained unexplored. Here, we investigate the transformation between hopfions and torons in various nanostructures using micromagnetic simulations. By tailoring the axial ratio of elliptical nanodisks, the elliptical hopfion is found to be transformed into a toron structure. Moreover, the current-driven topological transformation between hopfion and toron has also been realized in finite-sized nanostripes and stepped nanostructures. This deformation and transformation arise from the repulsive potential of the boundaries or edges. To connect real-space observations and 3D topological spin configurations, we simulate the Lorentz transmission electron microscope images of the aforementioned magnetic structures. This study, uncovering the dynamics and transformation of hopfions, will invigorate 3D magnetic structures-based memory and logic devices.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139394196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0