ChemInform abstract: structural studies of the disorder and phase transitions in the double perovskite Sr2YTaO6

Abstract

The evolution of the crystal structure of the title compound is monitored from room temperature to 1250 °C by powder neutron and synchrotron XRD. At 50 °C Sr2YTaO6 crystallizes with a monoclinic superstructure in the space group P21/n, at 1000 °C in the tetragonal space group I4/m, and at 1200 °C in the cubic space group Fm equation image m. The tilting of the octahedra which exists in the room temperature structure is progressively lost upon heating. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim