1. Ln 3FeGaQ7: A new series of transition-metal rare-earth chalcogenides.
- Author
-
Yin, Wenlong, Wang, Wendong, Kang, Lei, Lin, Zheshuai, Feng, Kai, Shi, Youguo, Hao, Wenyu, Yao, Jiyong, and Wu, Yicheng
- Subjects
- *
IRON compounds , *TRANSITION metals , *CHALCOGENIDES , *INORGANIC synthesis , *SOLID state chemistry , *CRYSTAL structure , *MAGNETIC susceptibility , *MAGNETIC properties of metals - Abstract
Abstract: A new series of transition-metal rare-earth chalcogenides, Ln 3FeGaQ7 (Ln=Nd, Sm, Gd, Dy, Q=S; Ln=Nd, Gd, Dy, Q=Se), have been synthesized by solid state reactions. They are isostructural and crystallize in the space group P63. They adopt a three-dimensional framework composed of LnQ7 monocapped trigonal prisms with the interesting [FeS3]4− chains and isolated GaQ4 tetrahedra lying in two sets of channels in the framework. Magnetic susceptibility measurements on Ln 3FeGaQ7 (Ln=Gd, Dy; Q=S, Se) indicate that they are paramagnetic and obey the Curie–Weiss law. Based on the diffuse reflectance spectra, Ln 3FeGaQ7 (Ln=Gd, Dy; Q=S, Se) should have band gaps smaller than 0.5eV. Electronic conductivity measurement on Dy3FeGaSe7 demonstrates semiconducting behavior with σ 300=0.124S/cm. The first-principles calculations were also performed to study the electronic structures of these compounds. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF