Cation Distribution and Interatomic Interactions in Oxides with Heterovalent Isomorphism:VIII.~1 A High-Temperature Study of the Structure of Gd_2SrAl_2O_7

摘要

The interatomic distances and distribution of gadolinium and strontium cations over two positions in the structure of Gd_2SrAl_2O_7 at 1273 K were determined by full-profile X-ray diffraction analysis.A comparative analysis was made of the anisotropy of thermal expansion of the coordination polyhedra in layered perovskite-like structures of the Sr_3Ti_2O_7 and K_2NiF_4 types.