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Two new sliver selenidoantimonates,namely,Ag_3SbSe_3 and Ag_5SbSe_4,were prepared under mid solvothermal conditions and structurally characterized by single-crystal X-ray diffraction studies.Ag_3SbSe_3 crystallizes in the orthorhombic space group Pnma(No.62) with a =8.2414(12),b = 11.4925(17),c = 21.220(3) A,V= 2009.8(5) A~3 and Z= 12.Its structure belongs to the β-Ag_3AsSe_3 type and features a 3D complex network composed of distorted trigonal planar AgSe_3 and tetrahedral AgSe_4 units as well as SbSe_3 trigonal pyramids.Ag_5SbSe_4 crystallizes in the orthorhombic system,nocentrosymmetric space group Cmc2_1(No.36) with a = 8.1148(6),b =12.9829(10),c = 8.7017(7) A,V= 916.76(12) A~3 and Z = 4.Its structure adopts the Ag_5SbS_4 type and features a 3D framework based on trigonal planar AgSe_3 units and SbSe_3 trigonal pyramids.The results of optical absorption spectra and band structure calculations indicate that the title compounds are narrow band-gap semiconductors.
Two New sliver selenidoantimonates, namely, Ag_3SbSe_3 and Ag_5SbSe_4, were prepared under mid solvothermal conditions and structurally characterized by single-crystal X-ray diffraction studies. Ag_3SbSe_3 crystallizes in the orthorhombic space group Pnma (No. 62) with a = 8.2414 , b = 11.4925 (17), c = 21.220 (3) A, V = 2009.8 (5) A~3 and Z = 12.Its structure belongs to the β-Ag_3AsSe_3 type and features a 3D complex network composed of distorted trigonal planar AgSe_3 and tetrahedral AgSe_4 units as well as SbSe_3 trigonal pyramids. Ag_5SbSe_4 crystallizes in the orthorhombic system, nocentrosymmetric space group Cmc2_1 (No.36) with a = 8.1148 (6), b = 12.9829 (10), c = , V = 916.76 (12) A ~ 3 and Z = 4.Its structure adopts the Ag_5SbS_4 type and features a 3D framework based on trigonal planar AgSe_3 units and SbSe_3 trigonal pyramids. The results of optical absorption spectra and band structure analysis indicate that the title compounds are narrow band-gap semiconductors.