High-pressure synthesis and characterization of a novel perovskite PbFe_<1/2>V_<1/2>O_3

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A novel perovskite, PbFe_<1/2>V_<1/2>O_3 was successfully synthesized under 7GPa. PbFe_<1/2>V_<1/2>O_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 Pb^<2+>, Fe^<3+>, and V^<5+>, respectively. The large tetragonal distortion is related to not only the presence of Pb^<2+> ion but also V^<5+> with an electronic configuration of d^0. No structural phase transition up to 490K 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 Fe^<3+> -O^<2-> -Fe^<3+> originated from the disordered arrangement of Fe^<3+> and V^<5+> ions.
2009-01-01