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- W2038850311 abstract "Synthetic exploration of K/Cu/Th/S quaternary phase space has yielded three new compounds: KCuThS 3 (I), K 2 -Cu 2 ThS 4 (II), and K 3 Cu 3 Th 2 S 7 (III). All three phases are semiconductors with optical band gaps of 2.95, 2.17, and 2.49 eV(I-III). Compound I crystallizes in the orthorhombic space group Cmcm with a = 4.076(1) A, b = 13.864-(4) A, and c = 10.541(3) A. Compound II crystallizes in the monoclinic space group C2/m with a = 14.522(1) A, b = 4.026(3) A, and c = 7.566(6) A; p = 109.949(1)°. Compound III crystallizes in orthorhombic space group Pbcn with a = 4.051(2) A, b = 14.023(8) A, and c = 24.633(13) A. The compounds are all layered materials, with each layer composed of threads of edge-sharing ThS 6 octahedra bridged by CuS 4 tetrahedral threads of varying dimension. The layers are separated by well-ordered potassium ions. The relatively wide range of optical band gaps is attributed to the extent of the CuS 4 motifs. As the dimension of the CuS 4 chains increases, band gaps decrease in the series. All materials were characterized by single-crystal X-ray diffraction, microprobe chemical analysis, and diffuse reflectance spectroscopy (NIR-UV)." @default.
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- W2038850311 date "2005-11-22" @default.
- W2038850311 modified "2023-09-23" @default.
- W2038850311 title "Three New Phases in the K/Cu/Th/S System: KCuThS3, K2Cu2ThS4, and K3Cu3Th2S7." @default.
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- W2038850311 doi "https://doi.org/10.1002/chin.200547002" @default.
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