{"title":"掺杂铬的 Cd3As2 Dirac 半金属晶体的合成与相组成","authors":"","doi":"10.1016/j.vacuum.2024.113692","DOIUrl":null,"url":null,"abstract":"<div><div>In this work we studied variation of structural and microstructural features of Cd<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>As<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> compound upon introducing the Cr component. Obtained X-ray diffraction data suggest that parent Cd<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>As<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> phase in studied polycrystals conserve both symmetry and volume of the unit crystal cell, implying low solubility limit of Cr (well below 1 at.<span><math><mtext>%</mtext></math></span>). Instead, addition of Cr results in the appearance of CrAs and pure Cd phases. The latter is detected in the form of inclusions of Cd–Cd<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>As<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> eutectic. Obtained data reveal that CrAs phase formation have rather specific mechanism related to As diffusion, as for large Cr-containing regions we observed clear gradient of As and Cr concentration with radial symmetry. Therefore, varying synthesis parameters one may obtain core–shell inclusions containing different Cr–As phases. Combination of results of thermal and microstructural analysis suggests that Cd<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>As<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> and CrAs phases are immiscible.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Synthesis and phase composition of Cd3As2 Dirac semimetal crystals doped with Cr\",\"authors\":\"\",\"doi\":\"10.1016/j.vacuum.2024.113692\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>In this work we studied variation of structural and microstructural features of Cd<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>As<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> compound upon introducing the Cr component. Obtained X-ray diffraction data suggest that parent Cd<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>As<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> phase in studied polycrystals conserve both symmetry and volume of the unit crystal cell, implying low solubility limit of Cr (well below 1 at.<span><math><mtext>%</mtext></math></span>). Instead, addition of Cr results in the appearance of CrAs and pure Cd phases. The latter is detected in the form of inclusions of Cd–Cd<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>As<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> eutectic. Obtained data reveal that CrAs phase formation have rather specific mechanism related to As diffusion, as for large Cr-containing regions we observed clear gradient of As and Cr concentration with radial symmetry. Therefore, varying synthesis parameters one may obtain core–shell inclusions containing different Cr–As phases. Combination of results of thermal and microstructural analysis suggests that Cd<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>As<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> and CrAs phases are immiscible.</div></div>\",\"PeriodicalId\":23559,\"journal\":{\"name\":\"Vacuum\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.8000,\"publicationDate\":\"2024-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Vacuum\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0042207X24007383\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Vacuum","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0042207X24007383","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Synthesis and phase composition of Cd3As2 Dirac semimetal crystals doped with Cr
In this work we studied variation of structural and microstructural features of CdAs compound upon introducing the Cr component. Obtained X-ray diffraction data suggest that parent CdAs phase in studied polycrystals conserve both symmetry and volume of the unit crystal cell, implying low solubility limit of Cr (well below 1 at.). Instead, addition of Cr results in the appearance of CrAs and pure Cd phases. The latter is detected in the form of inclusions of Cd–CdAs eutectic. Obtained data reveal that CrAs phase formation have rather specific mechanism related to As diffusion, as for large Cr-containing regions we observed clear gradient of As and Cr concentration with radial symmetry. Therefore, varying synthesis parameters one may obtain core–shell inclusions containing different Cr–As phases. Combination of results of thermal and microstructural analysis suggests that CdAs and CrAs phases are immiscible.
期刊介绍:
Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences.
A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below.
The scope of the journal includes:
1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes).
2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis.
3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification.
4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.