Synthesis and Characterization of New Phases: Sr_3.75K_1.75Bi₃O₁₂ and Sr_3.1Na_2.9Bi₃O₁₂

Author： Pshirkov J.S. Kazakov S.M. Abakumov A.M. Putilin S.N. Antipov E.V. Bougerol-Chaillout C. Lebedev O.I. van Tendeloo G.

Publisher： Academic Press

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.152, Iss.2, 2000-07, pp. : 492-502

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

New hexagonal phases were found in the Sr–K(Na)–Bi–O systems and characterized by X-ray powder diffraction, electron diffraction, and high-resolution electron microscopy (HREM). The crystal structures of Sr_3.75K_1.75Bi₃O₁₂ (space group P62m, a=10.4434(1) Å, c=3.37932(4) Å, R_I=0.019, R_P=0.055) and Sr_3.1Na_2.9Bi₃O₁₂ (space group P62m, a=10.1102(4) Å, c=3.3389(1) Å, R_I=0.024, R_P=0.070) were refined using X-ray powder data. The structures consist of chains of BiO₆ octahedra linked by the common edges whereas A cations occupy the interstices between the chains. This structure can be considered as the end member of the new (Sr, K)_6n+2Bi_3n-3O_12n homologous series found by electron microscopy. The homologues with n=4, 5, and 6 were observed, and their structures were deduced from HREM observations.