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New perovskite-related phases in the Bi-Pb-Sr-Ca-O system

✍ Scribed by C.C. Luhrs; M. Morales; F. Sapiña; D. Beltrán-Porter; A. Fuertes

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
478 KB
Volume
101-103
Category
Article
ISSN
0167-2738

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✦ Synopsis

The synthesis and characterization of some new phases in the title system which have a perovskite or closely related structure are reported. Two solid solutions with the same cationic stoichiometry and different oxygen content, Sr,~xCa,,,+,Bi,.,O,-, with 0 5 x 5 0.5 and S = 0 or 0.4-0.7, have been found. Both show monoclinic space groups but different structures and bismuth oxidation states, these latter close to + 5 (for 6 = 0) and + 4 (for 6 = 0.4-0.7). In the bismuth rich region a new Bi(II1) phase with the composition Bi,Sr,Ca,O,,,

showing also a monoclinic perovskite structure, is reported. Concerning lead phases, the solid solution SrPb,_,BixO,-, (0 5x 50.2) has been investigated by electron diffraction, thermal analysis and powder X-ray diffraction.

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