Intermetallic Charge Transfer in A-Site-Ordered Double Perovskite BiCu3Fe4O12

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• 作者：Youwen Long ; Takashi Saito ; Takenori Tohyama ; Kengo Oka ; Masaki Azuma ; Yuichi Shimakawa
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：September 7, 2009
• 年：2009
• 卷：48
• 期：17
• 页码：8489-8492
• 全文大小：726K
• 年卷期：v.48,no.17(September 7, 2009)
• ISSN：1520-510X

文摘

An A-site-ordered double perovskite BiCu₃Fe₄O₁₂ was synthesized at high-pressure and high-temperature conditions. Similar to the isostructural LaCu₃Fe₄O₁₂, the temperature-induced intermetallic charge transfer between the A′-site Cu and the B-site Fe ions occurs but at higher temperature (428 K) than LaCu₃Fe₄O₁₂ (393 K) does. This charge transfer causes an isostructural phase transition with volume contraction by 0.6% as well as semiconductor-to-metal and antiferromagnetism-to-paramagnetism transitions. Although the Bi cation at the A site does not take part in the charge transfer, it appears to enhance the charge-transfer temperature by stabilizing the square-planar coordinated Cu³⁺.