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Kihara S, Sakai Y, Wakazaki S, Nishikubo T, Koike T, Mibu K, Yu H, Okimoto Y, Koshihara SY, Azuma M. Bi0.5Pb0.5FeO3 with Unusual Pb Charge Disproportionation: Indication of a Systematic Charge Distribution Change in Bi0.5Pb0.5MO3 (M: 3d Transition Metal). Inorg Chem 2022; 61:12822-12827. [PMID: 35925759 DOI: 10.1021/acs.inorgchem.2c01911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Bi0.5Pb0.5FeO3 with 1:1 mixture of Bi and Pb having charge degrees of freedom at the A-site of perovskite oxide ABO3 is obtained for the first time by high-pressure synthesis. Comprehensive synchrotron X-ray powder diffraction, optical second harmonic generation, Mössbauer spectroscopy, and hard X-ray photoemission spectroscopy measurements revealed that Bi0.5Pb0.5FeO3 is a canted antiferromagnetic insulator crystalizing in a nonpolar tetragonal I4/mcm structure with √2a × √2a × 2a unit cell and has unusually Pb charge disproportionated Bi3+0.5Pb2+0.25Pb4+0.25Fe3+O3 charge distribution. The valence of transition metal M in Bi0.5Pb0.5MO3 changes from 3.5+ to 3+ and finally to 2+ from Mn to Fe and to Ni, from left to right in the periodic table as the 3d-level becomes deeper. The valences of Bi and Pb increase to compensate for the decrease in the M's valence, and Pb changes from 6s2 (2+) to 6s0 (4+) before Bi changes.
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Affiliation(s)
- Shiori Kihara
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Yuki Sakai
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan.,Kanagawa Institute of Industrial Science and Technology (KISTEC), Ebina 243-0435, Japan
| | - Shogo Wakazaki
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Takumi Nishikubo
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan.,Kanagawa Institute of Industrial Science and Technology (KISTEC), Ebina 243-0435, Japan
| | - Takehiro Koike
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Ko Mibu
- Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - Hongwu Yu
- Department of Chemistry, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - Yoichi Okimoto
- Department of Chemistry, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - Shin-Ya Koshihara
- Department of Chemistry, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - Masaki Azuma
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan.,Kanagawa Institute of Industrial Science and Technology (KISTEC), Ebina 243-0435, Japan
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