New Quaternary Rare-Earth Chalcogenides BaLnSn2Q6 (Ln = Ce, Pr, Nd, Q = S; Ln = Ce, Q = Se): Synthesis, Structure, and Magnetic Properties

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• 作者：Kai Feng ; Xu Zhang ; Wenlong Yin ; Youguo Shi ; Jiyong Yao ; Yicheng Wu
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：February 17, 2014
• 年：2014
• 卷：53
• 期：4
• 页码：2248-2253
• 全文大小：309K
• ISSN：1520-510X

文摘

The first series of rare-earth chalcogenides with mixed-valence Sn atoms, namely the BaLnSn₂Q₆ (Ln = Ce, Pr, Nd, Q = S; Ln = Ce, Q = Se) compounds, were synthesized via stoichiometric solid-state reactions at 1100 掳C. BaLnSn₂Q₆ belong to the polar space group Pmc2₁ of the orthorhombic system and contain mixed valent Sn atom in the ratio of Sn²⁺/Sn⁴⁺ = 1:3. In the structure, the Sn²⁺Q₅ rectangular pyramids, Sn⁴⁺Q₅ trigonal bipyramids, Sn⁴⁺Q₆ octahedra, and LnQ₈ bicapped trigonal prisms are connected with each other to form a three-dimensional framework with interspaces occupied by Ba²⁺ cations. As deduced from magnetic susceptibility measurements, BaPrSn₂S₆ and BaNdSn₂S₆ are paramagnetic and obey the Curie鈥揥eiss law.