Framework Structures of Interconnected Layers in Calcium Iron Arsenides

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• 作者：Tobias St眉rzer ; Christine Hieke ; Catrin L枚hnert ; Fabian Nitsche ; Juliane Stahl ; Christian Maak ; Roman Pobel ; Dirk Johrendt
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：June 16, 2014
• 年：2014
• 卷：53
• 期：12
• 页码：6235-6240
• 全文大小：420K
• 年卷期：v.53,no.12(June 16, 2014)
• ISSN：1520-510X

文摘

The new calcium iron arsenide compounds Ca_n(n+1)/2(Fe_1鈥?i>xM_x)_(2+3n)M鈥?sub>n(n鈥?)/2As_(n+1)(n+2)/2 (n = 1鈥?; M = Nb, Pd, Pt; M鈥?= 鈻? Pd, Pt) were synthesized and their crystal structures determined by single-crystal X-ray diffraction. The series demonstrates the structural flexibility of iron arsenide materials, which otherwise prefer layered structures, as is known from the family of iron-based superconductors. In the new compounds, iron arsenide tetrahedral layers are bridged by iron-centered pyramids, giving rise to so far unknown frameworks of interconnected FeAs layers. Channels within the structures are occupied with calcium and palladium or platinum, respectively. Common basic building blocks are identified that lead to a better understanding of the building principles of these structures and their relation to CaFe₄As₃.