B-Site Deficiencies in A-site-Ordered Perovskite LaCu3Pt3.75O12

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• 作者：Mikiko Ochi ; Ikuya Yamada ; Kenya Ohgushi ; Yoshihiro Kusano ; Masaichiro Mizumaki ; Ryoji Takahashi ; Shunsuke Yagi ; Norimasa Nishiyama ; Toru Inoue ; Tetsuo Irifune
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：April 1, 2013
• 年：2013
• 卷：52
• 期：7
• 页码：3985-3989
• 全文大小：267K
• 年卷期：v.52,no.7(April 1, 2013)
• ISSN：1520-510X

文摘

An A-site-ordered perovskite LaCu₃Pt_3.75O₁₂ was synthesized by replacing Ca²⁺ with La³⁺ in a cubic quadruple AA鈥?sub>3B₄O₁₂-type perovskite CaCu₃Pt₄O₁₂ under high-pressure and high-temperature of 15 GPa and 1100 掳C. In LaCu₃Pt_3.75O₁₂, 1/16 of B-site cations are vacant to achieve charge balance. The B-site deficiencies were evidenced by crystal structure refinement using synchrotron X-ray powder diffraction, hard X-ray photoemission spectroscopy, and soft X-ray absorption spectroscopy, leading to the ionic model La³⁺Cu²⁺₃Pt⁴⁺_3.75O^{2鈥?/sup>₁₂. Magnetic susceptibility data for this compound indicated a spin-glass-like behavior below T_g = 3.7 K, which is attributed to disturbance of the antiferromagnetic superexchange interaction by the B-site deficiencies.}