The crystal structure of CuCrSe2 in the temperature range 25 -1000 degrees C was studied by synchrotron X-ray diffraction. It was found that heating leads to the decomposition of stoichiometric CuCrSe2 into two phases of composition CuCr2Se4 and Cu1}xCrSe2 with increased Cu content. It was found that copper enrichment of CuCrSe2 during heating occurs up to the temperature of 800 degrees C and the limiting composition is close to the compound Cu4Cr3Se6. It was found that heating equalizes the copper distribution at the alpha-and beta-tetrahedrally coordinated chalcogen positions, but full equality of their occupancy at temperatures up to 1000 degrees C was not achieved. The low temperature limit of CuCr2Se4 excretion was established to be approximately 300 degrees C and the decomposition temperature of CuCr2Se4 to be approximately 1050 degrees C.
Shkvarina, E.g., Shkvarin, A.s., Titov, A.a., Postnikov, M.s., Plaisier, J.r., Gigli, L., et al. (2024). Thermal stability of the CuCrSe2. JOURNAL OF SOLID STATE CHEMISTRY, 330 [10.1016/j.jssc.2023.124497].
Thermal stability of the CuCrSe2
Gaboardi M.;
2024-01-01
Abstract
The crystal structure of CuCrSe2 in the temperature range 25 -1000 degrees C was studied by synchrotron X-ray diffraction. It was found that heating leads to the decomposition of stoichiometric CuCrSe2 into two phases of composition CuCr2Se4 and Cu1}xCrSe2 with increased Cu content. It was found that copper enrichment of CuCrSe2 during heating occurs up to the temperature of 800 degrees C and the limiting composition is close to the compound Cu4Cr3Se6. It was found that heating equalizes the copper distribution at the alpha-and beta-tetrahedrally coordinated chalcogen positions, but full equality of their occupancy at temperatures up to 1000 degrees C was not achieved. The low temperature limit of CuCr2Se4 excretion was established to be approximately 300 degrees C and the decomposition temperature of CuCr2Se4 to be approximately 1050 degrees C.| File | Dimensione | Formato | |
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