【摘 要】
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Brown needle-like crystals of CaEr2S4 were isolated as the major product from a reaction of elements and binary sulfides by a two-step flux technique. CaEr2S4 c
【机 构】
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State Key Laboratory of Structural Chemistry,Max Planck Institute for Solid State Research,Hefei Nat
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Brown needle-like crystals of CaEr2S4 were isolated as the major product from a reaction of elements and binary sulfides by a two-step flux technique. CaEr2S4 crystallizes in the orthorhombic space group Pnma with a=12.845(4), b=3.862(4), c=13.001(2)(A), V=645.0(7)(A)3,Z=4, F(000)=880,μ(MoKα)=27.794 mm-1, the final R=0.0528 and wR=0.0562 for 1070observed reflections with I ＞ 3σ(I). The CaEr2S4 structure forms a three-dimensional framework that consists of interconnected tetra-octahedral Er4S18 fragments. Ca2+cations, in a monocapped trigonal prism geometry, are stuffed in two parallel rows into the one-dimensional channels along the b direction. CaEr2S4 is an infrared-transparent semiconductor with a band gap of 1.81 eV. Magnetic susceptibility measurements over 6～300 K indicate a Curie-Weiss paramagnetic behavior for the phase, with an effective magnetic moment of 9.64(1) μB per Er3+ ion.
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