Synthèse et caractérisation d'une série de titanates pérowskites isotypes de [CaCu3](Mn4)O12期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Synthèse et caractérisation d'une série de titanates pérowskites isotypes de [CaCu₃](Mn₄)O₁₂

Authors:	B Bochu MN Deschizeaux JC Joubert A Collomb J Chenavas M Marezio

Institution:	Institut National Polytechnique de Grenoble, Laboratoire de Génie Physique, BP 46, 38402 St-Martin-d''Hères, France;Laboratoire des Rayons X, Centre National de la Recherche Scientifique, BP 166, 38042 Grenoble Cedex, France

Abstract:	A series of titanates which have perovskite-like arrangements and are isostructural with CaCu₃](Mn₄)O₁₂ have been synthesized. The total charge of the A sites can be modified (1) by substituting the Ca²⁺ cations with monovalent ones and the tetravalent manganese cations of the B sites by a mixture of (Ti⁴⁺ + M⁵⁺) in which M = Ta, Nb, Sb, or (2) by substituting the Ca²⁺ cations by a combination of cations plus vacancies. In this case, if the total charge of the A sites is 2, one obtains compounds such as $Th^{4+}_{12} □_{12} Cu_{3}](Ti_{4})O_{12}$ and $T^{3+}_{23} □_{13} Cu_{3}](Ti_{4} O_{12} (T = rare earth)$ ; on the contrary, if the charge is less than 2, then one has to compensate it by changing that of the B sites. This leads to compounds such as □Cu₃](Ti₂M₂)O₁₂ (M = Ta, Nb, Sb).

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