Preparation of Trigonal and Hexagonal Cuprous Chromite and Phase Transition Study Based on Single Crystal Structure Data

Abstract

Single crystals of trigonal 3R-CuCrO2were grown by a flux decomposition method. A new metastable hexagonal phase of 2H-CuCrO2was prepared by quenching the trigonal crystals from 1100°C to room temperature. A model of the atom shifts occurring during the 3R–2H structural phase transition is presented. During the transformation parts of the layered structure do not change. In other regions atom displacements up to 1.72(1) Å occur. The phase transition unites a first-coordination reconstructive transformation and a second-coordination distortional transformation.