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Structure Determination of Sr1.25Bi0.75O3 and Sr0.4K0.6BiO3 as a Function of Temperature from Synchrotron X-Ray Powder Diffraction Data

✍ Scribed by C. Bougerol-Chaillout; P. Bordet; S.M. Kazakov; J.S. Pshirkov; E.V. Antipov; S.N. Putilin; E. Dooryhee; A. Fitch

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 217 KB
Volume: 150
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8596

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✦ Synopsis

The structures of Sr 1.25 Bi 0.75 O 3 and superconducting Sr 0.4 K 0.6 BiO 3 have been determined from synchrotron X-ray powder di4raction data between 4 K and the decomposition temperature, at 973 and 573 K, respectively. The symmetry remains monoclinic (a+(2a p , b+(2a p , c+2a p , +903, P2 1 /n space group with two Bi sites allowing charge localization) for the undoped compound, and tetragonal (a+(2a p , c+2a p , I4/mcm space group with a unique Bi site implying a charge delocalization) for the K-doped phase, over the whole temperature range. In both cases the distortion from cubic symmetry decreases as temperature increases. Above 400 K, Sr 0.4 K 0.6 BiO 3 progressively loses oxygen until it reaches the Sr 0.4 K 0.6 BiO 2.5 stoichiometry, after which it decomposes.

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