High pressure synthesis, crystal structure and physical properties of a new Ni(II) perovskite BiNiO3

Shintaro Ishiwata; Masaki Azuma; Mikio Takano; Eiji Nishibori; Masaki Takata; Makoto Sakata; Kenichi Kato

doi:10.1039/B206022A

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High pressure synthesis, crystal structure and physical properties of a new Ni(ii) perovskite BiNiO₃

Shintaro Ishiwata,*^a Masaki Azuma,^ab Mikio Takano,^a Eiji Nishibori,^c Masaki Takata,^c Makoto Sakata^c and Kenichi Kato^d

Author affiliations

* Corresponding authors

^a Institute for Chemical Research, Kyoto University, Uji, Japan
E-mail: ishi@msk.kuicr.kyoto-u.ac.jp

^b PRESTO, Japan Science and Technology Corporation (JST), Kawaguchi, Japan

^c Department of Applied Physics, Nagoya University, Chigusa-ku, Japan

^d Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Japan

Abstract

A new triclinic perovskite, BiNiO₃, has been synthesized at a high pressure of 6 GPa in an oxidizing atmosphere. Structure refinements based on synchrotron X-ray powder diffraction and bond-valence calculations revealed a disproportionation of the Bi ions into Bi³⁺ and Bi⁵⁺, both being located in distorted oxygen octahedra. Because of the presence of Bi⁵⁺, the oxidation state of Ni was +2, rather than +3 as had been expected; BiNiO₃ thus showed insulating behavior with localized spins of S = 1.

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Correction HTM (2K)

Article information

DOI: https://doi.org/10.1039/B206022A
Article type: Paper
Submitted: 24 Jun 2002
Accepted: 20 Sep 2002
First published: 15 Oct 2002

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J. Mater. Chem., 2002,12, 3733-3737

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High pressure synthesis, crystal structure and physical properties of a new Ni(II) perovskite BiNiO₃

S. Ishiwata, M. Azuma, M. Takano, E. Nishibori, M. Takata, M. Sakata and K. Kato, J. Mater. Chem., 2002, 12, 3733 DOI: 10.1039/B206022A

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Journal of Materials Chemistry