Synthesis and crystal structure of Sr3Bi2O6 and structural change in the strontium-bismuth-oxide system

Yanquan Yang; Jian Li; Youyou Yuan; Fengjuan Pan; Dier Shi; Cong Lin; Xin Du; Junliang Sun

doi:10.1039/c7dt04610c

Synthesis and crystal structure of Sr₃Bi₂O₆ and structural change in the strontium-bismuth-oxide system

Dalton Trans. 2018 Feb 6;47(6):1888-1894. doi: 10.1039/c7dt04610c.

Authors

Yanquan Yang¹, Jian Li, Youyou Yuan, Fengjuan Pan, Dier Shi, Cong Lin, Xin Du, Junliang Sun

Affiliation

¹ Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. junliang.sun@pku.edu.cn.

PMID: 29340398
DOI: 10.1039/c7dt04610c

Abstract

The crystal structures and their changing trend in the strontium-bismuth-oxide system are critical for the studies of the related systems and their applications. The crystal structure of Sr₃Bi₂O₆ was obtained for the first time in the space group of R3[combining macron] with a huge unit cell of a = b = 25.1146(19) Å and c = 18.3685(16) Å and all bismuth ions are Bi³⁺ forming [BiO₃] trigonal pyramids. Sr₃Bi₂O₆ is a key compound for the structural change trend in the SrO-Bi₂O₃ binary oxide system at 1000 °C. With a decrease in the bismuth content, its valence state changes from +3 to +5 and Bi-O polyhedra changes from connected to isolated before Bi(v) appearance. In the system, the boundary of the solid solution β-phase (Sr_1-xBi_xO_1+0.5x) at 900 °C was also determined accurately as 0.770 ≤ x ≤ 0.862, experimentally.