Hydrothermal synthesis and crystal structure of a mixed-valence pyrochlore-type strontium bismuthate, (Sr0.75Bi0.25)2Bi2O6.83

Md SAIDUZZAMAN; Khandaker Monower HOSSAIN; Nobuhiro KUMADA; Sayaka YANAGIDA; Takahiro TAKEI; Yuji HANADA; Masanori NAGAO; Masaki AZUMA

doi:10.2109/jcersj2.20115

Regular Issue: Notes

Hydrothermal synthesis and crystal structure of a mixed-valence pyrochlore-type strontium bismuthate, (Sr_0.75Bi_0.25)₂Bi₂O_6.83

Md SAIDUZZAMAN, Khandaker Monower HOSSAIN, Nobuhiro KUMADA, Sayaka YANAGIDA, Takahiro TAKEI, Yuji HANADA, Masanori NAGAO, Masaki AZUMA

Author information

Md SAIDUZZAMAN
Center for Crystal Science and Technology, University of Yamanashi
Department of Materials Science and Engineering, Khulna University of Engineering and Technology (KUET)
Khandaker Monower HOSSAIN
Center for Crystal Science and Technology, University of Yamanashi
Nobuhiro KUMADA
Center for Crystal Science and Technology, University of Yamanashi
Sayaka YANAGIDA
Center for Crystal Science and Technology, University of Yamanashi
Takahiro TAKEI
Center for Crystal Science and Technology, University of Yamanashi
Yuji HANADA
Center for Crystal Science and Technology, University of Yamanashi
Masanori NAGAO
Center for Crystal Science and Technology, University of Yamanashi
Masaki AZUMA
Laboratory for Materials and Structures, Tokyo Institute of Technology

Keywords: Hydrothermal synthesis, Strontium bismuthate, Pyrochlore

JOURNAL FREE ACCESS

2020 Volume 128 Issue 9 Pages 660-663

DOI https://doi.org/10.2109/jcersj2.20115

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Abstract

A pyrochlore-type strontium bismuthate, (Sr_0.75Bi_0.25)₂Bi₂O_6.83 was synthesized by a hydrothermal method using NaBiO₃·nH₂O as a starting material. The crystal structure was refined using synchrotron powder X-ray diffraction data. The final R-factors were R_wp = 8.07 % and R_p = 5.87 %, and the lattice parameter was a = 11.0195 (2) Å. This compound had a mixed bismuth valence state involving Bi³⁺ and Bi⁵⁺, where Bi³⁺ partially occupied the A-site (Sr²⁺) as well as the B-site (Bi⁵⁺) in the pyrochlore-type structure. Moreover, the present compound was found to be a diamagnetic semiconductor with electrical resistivity of ∼90 Ωm at room temperature.

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