Synthesis and characterization of novel 6-H perovskites Ba2CO2-xSbxO6-y, 0.6 <= x <= 0.8 and x=1.33 (Ba3CoSb2O9)

Istomin, S.Y.; Koutcenko, V.A.; Antipov, E.V.; Lindberg, F.; Svensson, G.

Авторы: Istomin S.Y., Koutcenko V.A., Antipov E.V., Lindberg F., Svensson G.
Журнал: Materials Research Bulletin
Том: 39
Номер: 7-8
Год издания: 2004
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 1013
Последняя страница: 1022
DOI: 10.1016/j.mattersbull.2004.03.009
Аннотация: 6-H perovskites with compositions Ba2Co2-xSbxO6-y, 0.6 less than or equal to x less than or equal to 0.8 and x = 1.33 (Ba3CoSb2O9) have been prepared in air at 1150 degreesC. Refinements of the crystal structures of Ba2Co1.4Sb0.6O6-y and Ba3CoSb2O9 were performed in space group P6(3)/MMC, using neutron and X-ray powder diffraction data, respectively: Ba2Co1.4Sb0.6O6-y a = 5.7315(1) Angstrom, c = 14.1118(4) Angstrom, R-F(2) = 0.0669, R-p = 0.0464, chi(2) = 1.39; Ba3CoSb2O9 a = 5.85321(7) Angstrom, c = 14.4454(2) Angstrom, R-F(2) = 0.0458, R-p = 0.0258, chi(2) = 1.24. In Ba3CoSb2O9 atoms are located in pairs of face-sharing octahedra separated by cobalt atoms in octahedral layers, while in Ba3Co1.4Sb0.6O6-y, a random distribution of B cations was found. In the latter structure, oxygen vacancies are preferably located in BaO3 planes separating the face-sharing octahedra. Electron diffraction and high-resolution electron microscopy studies showed that the structures are well ordered. Results of the magnetic susceptibility measurements of Ba3CoSb2O9 and Ba2CO1.4Sb0.6O6-y are reported. (C) 2004 Elsevier Ltd. All rights reserved.
Добавил в систему: Антипов Евгений Викторович

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Synthesis and characterization of novel 6-H perovskites Ba2CO2-xSbxO6-y, 0.6 <= x <= 0.8 and x=1.33 (Ba3CoSb2O9)статья