Synthesis and structural characterization of Ba(Ln2/3IIIB1/3VI)O3 (LnIII = Dy, Gd, and Sm; BVI = Mo or W) complex perovskites

We describe in this work the synthesis and crystal structure of five rare earth and Mo(VI) or W(VI) containing complex perovskites. The compounds studied are Ba(Dy2/3Mo1/3)O-3, Ba(Dy2/3W1/3)O-3, Ba(Gd2/3Mo1/3)O-3, Ba(Gd2/3W1/3)O-3 and Ba(Sm2/3W1/3)O-3 and were prepared starting from solutions, by the polymeric precursors method. Structural characterization by HREM, SAED and powder XRD revealed the five compounds to be ordered cubic perovskites, SG Fm-3m (225), with a cell parameter double of that of a simple perovskite cell and increasing as the size of the trivalent lanthanide ion increases (Dy < Gd < Sm). (C) 2003 Elsevier Inc. All rights reserved.