无机材料学报Issue(2)：165-170,6.DOI:10.15541/jim20150232
CdGeAs2晶体的热膨胀行为研究
Thermal Expansion Behaviors of CdGeAs2 Crystal
摘要
Abstract
Thermal expansion measurements by WinTA 100 on tetragonal chalcopyrite cadmium germanium arsenide (CdGeAs2) crystal were carried out in the temperature range between 320 K and 620 K. Based on these measurements, the mechanisms of thermal expansion anisotropy is proposed. It is found that the axial thermal expansion coefficients (αa and αc) are both positive, and ߙ>>ߙ, which exhibits anisotropic thermal behavior intensively. By the least squares method, the functional relationship between structural parameters (a, c) and temperature (T) is set up, which are coincident with published literature. Furthermore, the tetragonal distortion δ=2–c/a, the interatomic distances (lCdିAs and lGeିAs) and the bond expansion coefficients (αCdିAs and αGeିAs) are calculated at different temperatures, respectively. Simultaneously, it is also found that a, c,δ, lCdିAs, lGeିAs, and αGeିAs increase with temperature increase, while c/a and αGeିAs are just the opposite. When T=360 K, ߙCdିAs is 6.36 times of αGeିAs. Hence, the difference between αCdିAs and ߙGeିAs is the main reason for the significant anisotropy of thermal expansion.关键词
CdGeAs2晶体/热膨胀/四方畸变Key words
CdGeAs2/thermal expansion/tetragonal distortion分类
数理科学引用本文复制引用
甄珍,赵北君,朱世富,何知宇,陈宝军,黄巍,蒲云肖,钟义凯..CdGeAs2晶体的热膨胀行为研究[J].无机材料学报,2016,(2):165-170,6.基金项目
国家自然科学基金重点项目(50732005) （50732005）
国家863计划项目(2007AA03Z443) National Natural Science Foundation Key Programs of China (50732005) （2007AA03Z443）
the 863 National High Technology Research and Development Program of China (2007AA03Z443) （2007AA03Z443）
