A series of oxygen-defect perovskites containing CuII and CuIII: The oxides La3−xLnxBa3 [CuII5−2y CuIII1+2y] O14+y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

A series of oxygen-defect perovskites containing Cu^II and Cu^III: The oxides La_3−xLn_xBa₃ [Cu^II_5−2y Cu^III_1+2y] O_14+y

Authors:	L. Er-Rakho C. Michel J. Provost B. Raveau

Affiliation:	Laboratoire de Cristallographie et Chimie du Solide associé au CNRS, L.A. 251, Institut des Sciences de la Matière et du Rayonnement, Université de Caen, Esplanade de la Paix, 14032, Caen Cédex, France

Abstract:	A series of oxygen-defect perovskites, containing Cu^II and Cu^III, La₃Ba₃ [Cu^II_5?2y Cu^III_1+2y] O_14+y, has been synthesized at 1000°C, for 0.05 ≤ y ≤ 0.43. The substitution of lanthanum for yttrium and lanthanides has been studied. These oxides are tetragonal: $a = a_{p} 2^{12}$ and c = 3a_p. The structural study of La₃Ba₃ Cu₆O_14.10 shows that oxygen vacancies are ordered, involving for copper three sorts of coordination: square, pyramidal (4 + 1), and distorted octahedral (4 + 2). The distribution of Cu^III, as well as the lanthanide ions on the different sites, is discussed.

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