Ba3LnInS6 (Ln = Pr, Sm, Gd, Yb) and Ba2LnGaS5 (Ln = Pr, Nd): Syntheses, Structures, and Magnetic and Optical Properties

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• 作者：Kai Feng ; Youguo Shi ; Wenlong Yin ; Wendong Wang ; Jiyong Yao ; Yicheng Wu
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：October 15, 2012
• 年：2012
• 卷：51
• 期：20
• 页码：11144-11149
• 全文大小：295K
• 年卷期：v.51,no.20(October 15, 2012)
• ISSN：1520-510X

文摘

Six new quaternary rare-earth sulfides Ba₃LnInS₆ (Ln = Pr, Sm, Gd, Yb) and Ba₂LnGaS₅ (Ln = Pr, Nd) have been synthesized for the first time. Ba₃LnInS₆ (Ln = Pr, Sm, Gd, Yb) belong to the centrosymmetric space group R3̅c of the trigonal system. The structures contain infinite one-dimensional anionic chains ₁^{鈭?/sup>[LnInS₆]6鈥?/sup>, which are built from face-sharing LnS₆ distorted triangular prisms and InS₆ octahedra. Ba₂LnGaS₅ (Ln = Pr, Nd) crystallize in the centrosymmetric space group I4/mcm of the tetragonal system. Their structures consist of (BaLn)S layers built from (BaLn)S₈ bicapped trigonal prisms. These layers are stacked perpendicular to the c axis and further connected by GaS₄ tetrahedra to form a three-dimensional framework with channels occupied by Ba2+ cations. As deduced from magnetic susceptibility measurements on Ba₂NdGaS₅, it is paramagnetic and obeys the Curie鈥揥eiss law. Besides, the band gap of Ba₂NdGaS₅ is determined to be about 2.12(2) eV.}