{"title":"高压合成过氮化钒cual2型VN2的热膨胀行为","authors":"Shuto Asano , Ken Niwa , Takuya Sasaki , Masashi Hasegawa","doi":"10.1016/j.progsolidstchem.2023.100426","DOIUrl":null,"url":null,"abstract":"<div><p>CuAl<sub>2</sub>-type VN<sub>2</sub><span>, which is synthesized under high pressure, is a recoverable material at ambient conditions and has a high bulk modulus. In this study, we investigated the thermal expansion behavior of CuAl</span><sub>2</sub>-type VN<sub>2</sub> by low-temperature X-ray diffraction measurements between 109.3(5) K and 298.3(8) K. The axial thermal expansion coefficient of VN<sub>2</sub> was determined to be <em>α</em><sub><em>a</em></sub> = 2.7(9) × 10<sup>−6</sup> K<sup>−1</sup> and <em>α</em><sub><em>c</em></sub> = 17.8(12) × 10<sup>−6</sup> K<sup>−1</sup> at 298.3(8) K, which has large anisotropy similar to that of compression behavior. It is found that the small coefficient of thermal expansion of the <em>a</em>-axis is due to the negative and positive effects on the <em>a</em>-axis length with increasing temperature of the bond angles and bond lengths of VN<sub>2</sub>, respectively. As a result, VN<sub>2</sub> exhibits very large anisotropic thermal expansion behavior.</p></div>","PeriodicalId":415,"journal":{"name":"Progress in Solid State Chemistry","volume":null,"pages":null},"PeriodicalIF":9.1000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Thermal expansion behavior of vanadium pernitride, CuAl2-type VN2, synthesized under high pressures\",\"authors\":\"Shuto Asano , Ken Niwa , Takuya Sasaki , Masashi Hasegawa\",\"doi\":\"10.1016/j.progsolidstchem.2023.100426\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>CuAl<sub>2</sub>-type VN<sub>2</sub><span>, which is synthesized under high pressure, is a recoverable material at ambient conditions and has a high bulk modulus. In this study, we investigated the thermal expansion behavior of CuAl</span><sub>2</sub>-type VN<sub>2</sub> by low-temperature X-ray diffraction measurements between 109.3(5) K and 298.3(8) K. The axial thermal expansion coefficient of VN<sub>2</sub> was determined to be <em>α</em><sub><em>a</em></sub> = 2.7(9) × 10<sup>−6</sup> K<sup>−1</sup> and <em>α</em><sub><em>c</em></sub> = 17.8(12) × 10<sup>−6</sup> K<sup>−1</sup> at 298.3(8) K, which has large anisotropy similar to that of compression behavior. It is found that the small coefficient of thermal expansion of the <em>a</em>-axis is due to the negative and positive effects on the <em>a</em>-axis length with increasing temperature of the bond angles and bond lengths of VN<sub>2</sub>, respectively. As a result, VN<sub>2</sub> exhibits very large anisotropic thermal expansion behavior.</p></div>\",\"PeriodicalId\":415,\"journal\":{\"name\":\"Progress in Solid State Chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":9.1000,\"publicationDate\":\"2023-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Progress in Solid State Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0079678623000377\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Progress in Solid State Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0079678623000377","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
Thermal expansion behavior of vanadium pernitride, CuAl2-type VN2, synthesized under high pressures
CuAl2-type VN2, which is synthesized under high pressure, is a recoverable material at ambient conditions and has a high bulk modulus. In this study, we investigated the thermal expansion behavior of CuAl2-type VN2 by low-temperature X-ray diffraction measurements between 109.3(5) K and 298.3(8) K. The axial thermal expansion coefficient of VN2 was determined to be αa = 2.7(9) × 10−6 K−1 and αc = 17.8(12) × 10−6 K−1 at 298.3(8) K, which has large anisotropy similar to that of compression behavior. It is found that the small coefficient of thermal expansion of the a-axis is due to the negative and positive effects on the a-axis length with increasing temperature of the bond angles and bond lengths of VN2, respectively. As a result, VN2 exhibits very large anisotropic thermal expansion behavior.
期刊介绍：
Progress in Solid State Chemistry offers critical reviews and specialized articles written by leading experts in the field, providing a comprehensive view of solid-state chemistry. It addresses the challenge of dispersed literature by offering up-to-date assessments of research progress and recent developments. Emphasis is placed on the relationship between physical properties and structural chemistry, particularly imperfections like vacancies and dislocations. The reviews published in Progress in Solid State Chemistry emphasize critical evaluation of the field, along with indications of current problems and future directions. Papers are not intended to be bibliographic in nature but rather to inform a broad range of readers in an inherently multidisciplinary field by providing expert treatises oriented both towards specialists in different areas of the solid state and towards nonspecialists. The authorship is international, and the subject matter will be of interest to chemists, materials scientists, physicists, metallurgists, crystallographers, ceramists, and engineers interested in the solid state.
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