High-pressure synthesis and characterization of a novel perovskite PbFe1/2v1/2O3

Abstract

A novel perovskite, FbFe1/2V1/2O3 was successfully synthesized under 7 GPa. PbFe1/2V1/2O 3 exhibits a highly distorted tetragonal perovskite structure (c/a = 1.18) with the disordered arrangement of Fe and V at room temperature. The XPS reveals that the oxidation states of each ion are Pb2+, Fe 3+, and V5+, respectively. The large tetragonal distortion is related to not only the presence of Pb2+ ion but also V 5+ with an electronic configuration of d0. No structural phase transition up to 490 K above room temperature was observed by a high-temperature X-ray diffraction experiment. The temperature dependence of magnetic susceptibility exhibits non-Curie-Weiss behavior, which is attributed to the antiferromagnetic interaction between Fe3+-O 2--Fe3+ originated from the disordered arrangement of Fe3+ and V5+ ions. © 2009 The Ceramic Society of Japan. All rights reserved.