Crystal Structures and Electronic States of High-Pressure-Synthesized (1-x)PbVO3-xBiCrO3 Solid Solutions

Journal of Asian Ceramic Societies

Ikuya Yamada¹  Atsushi Tanaka¹  Haruna Aizawa²  Kaoru Toda²  Hajime Yamamoto²  Hiroyuki Kimura²  Takumi Nishikubo³  Masaki Azuma⁴  Yuki Sakai⁴ 

[1] Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, Osaka, Japa;Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japa;Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Japa;Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Japa;Kanagawa Institute of Industrial Science and Technology, Kanagawa, Japa;

关键词: High-pressure synthesis;    solid solution;    valence state;    magnetism;   

DOI  :  10.1080/21870764.2021.1944556

来源: Taylor & Francis

【 摘 要 】

Electronic states in solid-solution transition metal oxides may differ from those in their parent compounds, and this results in interesting electronic properties. In this study, the valence states and electronic properties of solid solutions of (1 − x)PbVO3− xBiCrO3 are reported. The solid solutions are successfully synthesized under high-pressure and high-temperature conditions of 5 GPa or 7 GPa and 1273 K, respectively. A change in the crystal structure from centrosymmetric monoclinic (C2/c), as in BiCrO3, to polar tetragonal (P4mm), as in PbVO3, is observed. A tetragonal-to-cubic phase transition, which results in a negative thermal expansion, was observed in 7/8PbVO3-1/8BiCrO3 at approximately 700 K. X-ray absorption spectroscopy and magnetic studies reveal that the Cr and V atoms are in the valence states 3+ and 4+, respectively, which are the same as those of the parent compounds. Thus, it was concluded that the valence state of V4+/Cr3+ and the electron localization in the (1 − x)PbVO3− xBiCrO3 solid solutions are considerably robust.

【 授权许可】

CC BY