Abstract
Multinary rare-earth metal chalcogenides have aroused great concern owing to their special structure characteristics and diverse physical functions. In this work, five novel rare-earth chalcogenides adopt the formula Cs2[RE8InS14] (where RE = Ho–Lu), obtained by the elemental mixture in CsCl flux at 1273 K. They are isotype and belong to orthorhombic Cmca (no. 64) [a = 15.711(7)–15.385(2) A, b = 22.232(2)–21.786(2) A, c = 15.483(5)–15.244(2) A, V = 5408.4(4)–5130.1(7) A3 and Z = 8], exhibiting a dense 3D [RE8InS14] framework consisting of RES6 octahedron and discrete InS4 tetrahedron. The large closed-cavities of Cs4@S26 are far apart and embedded within the network along bc-plane, which was discovered for the first time. The band gaps from 2.45 to 2.72 eV for Cs2[RE8InS14] were deduced from the UV–Vis–NIR spectroscopy based on the Kubelka–Munk function. A magnetic test indicates that the Cs2[RE8InS14] (RE = Ho–Yb) compounds possess paramagnetism above 50 K. In addition, the solid-state preparation, struc...
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