K2MM′3Se6 (M= Cu, Ag; M′ = Ga, In), a new series of metal chalcogenides with chain-sublayer-chain slabs:: ∞1[M′Se4]-∞2[(MSe4)(M′Se4)]-∞1[M′Se4]

被引:28
|
作者
Ma, HW [1 ]
Guo, GC [1 ]
Wang, MS [1 ]
Zhou, GW [1 ]
Lin, SH [1 ]
Dong, ZC [1 ]
Huang, JS [1 ]
机构
[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fujian 350002, Peoples R China
关键词
D O I
10.1021/ic025936i
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A new series of novel isostructural metal chalcogenides, K2CuIn3Se6 (1), K2CuGa3Se6 (2), and K2AgIn3Se6 (3), were obtained by a reactive flux technique and structurally characterized. Compounds 1, 2, and 3 crystallize in the space group C2/c of the monoclinic system with eight formula units in a cell: a = 11.445(2) Angstrom, b = 11.495(2) Angstrom, c = 21.263(4) Angstrom, beta = 97.68(3)degrees, V = 2772(1) Angstrom(3), R1/wR2 = 0.0676/0.1652 for 1; a = 11.031(2) Angstrom, b = 11.050(4) Angstrom, c = 20.808(7) Angstrom, beta = 97.71(2)degrees, V = 2513(1) Angstrom(3), R1/wR2 = 0.0301/0.0511 for 2; and a = 11.633(1) Angstrom, b = 11.587(1) Angstrom, c = 21.355(1) Angstrom, beta = 98.010(8)degrees, V = 2850.4(4) Angstrom(3), R1/wR2 = 0.0471/0.0732 for 3. These isostructural compounds are characterized by a chain-sublayer-chain slab structure. The sublayer, composed of alternative corner-sharing mixed-metal tetrahedra, is sandwiched by parallel corner-sharing tetrahedral chains. Optical absorption spectra of compounds 1, 2, and 3 reveal the presence of a sharp optical gap of 1.68, 1.72, and 1.64 eV, respectively, suggesting that these materials are semiconductors and suitable for efficient absorption of solar radiation in solar cell applications. IR spectra show no obvious absorption in the range 800-4000 cm(-1).
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页码:1366 / 1370
页数:5
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