• 作者：Mayouf Sellami ; Ninh Nguyen ; Ahmed Bekka and Noureddine Bettahar
• 刊名：Comptes Rendus Chimie
• 出版年：2006
• 期刊代码：119_16310748
• 类别：ch
• 出版时间：September 2006
• 卷：9
• 期：9
• 页码：1209-1214
• 文件大小：430 K

Synthesis and magnetic properties study of solids solutions (Bi_1.524–xM_xCu_0.476)[Sb_1.524Cu_0.476]O_7+δ with M = Ca et Pb. The solid solutions with pyrochlore-like structure and general chemical formula (Bi_1.524–xM_xCu_0.476)[Sb_1.524Cu_0.476]O_7+δ (M = Ca²⁺, Pb²⁺) have been synthesized by solid-state chemical reaction at high temperature. The two solutions crystallize in the cubic system, with Fdm space group. Domains of homogeneity are 0 ≤ x ≤ 0.30 and 0 ≤ x ≤ 0.26 for calcium and lead, respectively. A regular decreasing of the cell parameter has been observed in the calcium solid solution. The state oxidation +5 of antimony has been put in evidence by the Mössbauer spectrometry of ¹²¹Sb. Magnetic susceptibility measurements showed that the effective magnetic moment of copper in these compounds decreases when bismuth is substituted for calcium. To cite this article: M. Sellami et al., C. R. Chimie 9 (2006).