High-Temperature Order−Disorder Transition in CoCr<sub>2</sub>Se<sub>4</sub> and Trapping Co Disorder in Monoclinic CoCr<sub>2</sub>Se<sub>4</sub>: Structural Features of Cu<sub>1−<i>x</i></sub>Co<sub><i>x</i></sub>Cr<sub>2</sub>Se<sub>4</sub> Phases
收藏NIAID Data Ecosystem2026-03-06 收录
数据链接：
官方服务：
资源简介：
X-ray diffraction studies on the Cu1−xCoxCr2Se4 system (x = 0, 0.2, 0.4, 0.6, 0.8, 1) proved the existence of the cubic spinel-type structure for x ≤ 0.2 and the monoclinic Cr3S4-type one for x ≥ 0.8. CoCr2Se4 undergoes an order−disorder phase transition above 750 °C. The high-temperature CoCr2Se4 polymorph crystallizes in the filled GdI2-type structure with the P3̅m1 space group. The trigonal-to-monoclinic symmetry breaking in CoCr2Se4 is found to be first-order within Landau theory. Co distribution in the low-temperature monoclinic CoCr2Se4 structure depends on cooling conditions of trigonal CoCr2Se4: rapid quenching results in Co disorder in the monoclinic structure, while slow cooling yields a fully ordered monoclinic structure.
创建时间：
2016-02-26
