Structural and Magnetic Properties of A-Site-Ordered Perovskites ACu3Sn4O12 with A = Ca2+, Sr2+, and Pb2+

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• 作者：Hiroshi Shiraki ; Takashi Saito ; Yuichi Shimakawa
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：November 25, 2008
• 年：2008
• 卷：20
• 期：22
• 页码：7077-7080
• 全文大小：162K
• 年卷期：v.20,no.22(November 25, 2008)
• ISSN：1520-5002

文摘

A series of A-site-ordered perovskites ACu₃Sn₄O₁₂ with A = Ca²⁺, Sr²⁺, and Pb²⁺ were prepared under high-temperature and high-pressure conditions. They have Cu²⁺ ions with S = 1/2 spins at the A site in the ABO₃ perovskite structure and have nonmagnetic Sn⁴⁺ ions at the B sites. An increase in the size of the divalent A-site ions from Ca to Pb increases the cubic lattice constant by only 0.6%. The cubic lattice with rigid CuO₄ units thus hardly expands and the different sizes of the A-site ions are accommodated by change of the SnO₆ octahedra. The difference in the size of the A-site ions has little effect on the ferromagnetic transition temperatures, because the magnetic properties of these perovskites are determined primarily by the direct ferromagnetic interaction between Cu²⁺ ions at the A site.