Structures, Physical Properties, and Chemistry of Layered Oxychalcogenides and Oxypnictides

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• 作者：Simon J. Clarke ; Paul Adamson ; Sebastian J. C. Herkelrath ; Oliver J. Rutt ; Dinah R. Parker ; Michael J. Pitcher ; Catherine F. Smura
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：October 6, 2008
• 年：2008
• 卷：47
• 期：19
• 页码：8473-8486
• 全文大小：560K
• 年卷期：v.47,no.19(October 6, 2008)
• ISSN：1520-510X

文摘

A series of layered oxychalcogenide and oxypnictide solids is described that contain oxide layers separated by distinct layers, which contain the softer chalcogenide (S, Se, Te) or pnictide (P, As, Sb, Bi) anions. The relationships between the crystal structures adopted by these compounds are described, and the physical and chemical properties of these materials are related to the structures and the properties of the elements. The properties exhibited by the oxychalcogenide materials include semiconductor properties, for example, in LaOCuCh (Ch = chalcogenide) and derivatives, unusual magnetic properties exhibited by the class Sr₂MO₂Cu_2−δS₂ (M = Mn, Co, Ni), and redox properties exhibited by the materials Sr₂MnO₂Cu_2m−0.5S_m+1 (m = 1−3) and Sr₄Mn₃O_7.5Cu₂Ch₂ (Ch = S, Se). Recent results in the oxychalcogenide area are reviewed, and some new results on the intriguing series of compounds Sr₂MO₂Cu_2−δS₂ (M = Mn, Co, Ni) are reported. Oxypnictides have received less recent attention, but this is changing: a new frenzy of research is underway following the discovery of high-temperature superconductivity (>40 K) in derivatives of the layered oxyarsenide LaOFeAs. The early results in this exciting new area will be reviewed.