Two New Arsenides, Eu7Cu44As23 and Sr7Cu44As23, With a New Filled Variety of the BaHg11 Structure

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• 作者：Dmitri O. Charkin ; Roman Demchyna ; Yurii Prots ; Horst Borrmann ; Ulrich Burkhardt ; Ulrich Schwarz ; Walter Schnelle ; Igor V. Plokhikh ; Sergey M. Kazakov ; Artem M. Abakumov ; Dmitry Batuk ; Valery Yu. Verchenko ; Alexander A. Tsirlin ; Caroline Curfs ; Yuri Grin ; Andrei V. Shevelkov
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：October 20, 2014
• 年：2014
• 卷：53
• 期：20
• 页码：11173-11184
• 全文大小：956K
• ISSN：1520-510X

文摘

Two new ternary arsenides, namely, Eu₇Cu₄₄As₂₃ and Sr₇Cu₄₄As₂₃, were synthesized from elements at 800 掳C. Their crystal structure represents a new filled version of the BaHg₁₁ motif with cubic voids alternately occupied by Eu(Sr) and As atoms, resulting in a 2 脳 2 脳 2 superstructure of the aristotype: space group Fm3虆m, a = 16.6707(2) 脜 and 16.7467(2) 脜, respectively. The Eu derivative exhibits ferromagnetic ordering below 17.5 K. In agreement with band structure calculations both compounds are metals, exhibiting relatively low thermopower, but high electrical and low thermal conductivity.