{"title":"Anomalous Temperature Dependences of the Band Gap and Thermal Expansion Coefficients in AgInSe2 Single Crystals","authors":"A. Kh. Matiyev","doi":"10.1134/S0020168523100084","DOIUrl":null,"url":null,"abstract":"<p>Temperature dependences of lattice parameters for AgInSe<sub>2</sub> single crystals have been used to determine their thermal expansion coefficients along the <i>a</i> and <i>c</i> crystallographic axes. The results demonstrate that the thermal expansion coefficients of the AgInSe<sub>2</sub> single crystals in the <i>a</i>- and <i>c</i>-axis directions change sign at temperatures of 142 and 135 K, respectively. Analysis of the temperature-dependent band gap of AgInSe<sub>2</sub> with the use of optical absorption spectra shows that its band gap increases with increasing temperature in the range 80–120 K and decreases in the range 120–300 K.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"59 10","pages":"1054 - 1059"},"PeriodicalIF":0.9000,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S0020168523100084","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Temperature dependences of lattice parameters for AgInSe2 single crystals have been used to determine their thermal expansion coefficients along the a and c crystallographic axes. The results demonstrate that the thermal expansion coefficients of the AgInSe2 single crystals in the a- and c-axis directions change sign at temperatures of 142 and 135 K, respectively. Analysis of the temperature-dependent band gap of AgInSe2 with the use of optical absorption spectra shows that its band gap increases with increasing temperature in the range 80–120 K and decreases in the range 120–300 K.
利用 AgInSe2 单晶体晶格参数的温度依赖性，确定了它们沿 a 和 c 晶轴方向的热膨胀系数。结果表明，AgInSe2 单晶体在 a 轴和 c 轴方向的热膨胀系数分别在 142 K 和 135 K 的温度下发生符号变化。利用光吸收光谱分析 AgInSe2 随温度变化的带隙表明，其带隙在 80-120 K 范围内随温度升高而增大，在 120-300 K 范围内则随温度升高而减小。
期刊介绍：
Inorganic Materials is a journal that publishes reviews and original articles devoted to chemistry, physics, and applications of various inorganic materials including high-purity substances and materials. The journal discusses phase equilibria, including P–T–X diagrams, and the fundamentals of inorganic materials science, which determines preparatory conditions for compounds of various compositions with specified deviations from stoichiometry. Inorganic Materials is a multidisciplinary journal covering all classes of inorganic materials. The journal welcomes manuscripts from all countries in the English or Russian language.
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