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- W4229697466 abstract "The crystal structures of six members of the homologous series with general formula [BiQX]2[AgxBi1−xQ2−2xX2x−1]N+1 (Q = S, Se; X = Cl, Br; 1/2 ≤ x ≤ 1) and N = 4, 5, or 7 were determined by single-crystal X-ray diffraction. The series are characterized by the parameters N and x and are denoted (N, x)P. Ag3Bi4S6Cl3 (x = 0.60) (I), Ag3.5Bi3.5S5Br4 (x = 0.70) (II) and Ag3.65Bi3.35Se4.70Br4.30 (x = 0.73) (III) belong to (4, x)P series Ag5xBi7−5xQ12−10xX10x−3 and adopt the AgBi6S9 structure type. The (5, x)P compound Ag3.66Bi4.34S6.68Br3.32 (IV), which corresponds to x = 0.61 in Ag6xBi8−6xS14−12xBr12x−4, crystallizes isostructurally to AgBi3S5. The compounds Ag4.56Bi5.44Se8.88Br3.12 (x = 0.57) (V) and Ag5.14Bi4.86S7.76Br4.24 (x = 0.64) (VI), which are members of (7, x)P series Ag8xBi10−8xQ18−16xBr16x−6, adopt the Ag3Bi7S12 structure type. In the monoclinic crystal structures (space group C2/m) two kinds of layered modules alternate along [001]. Modules of type A uniformly consist of paired rods of face-sharing monocapped trigonal prisms around Bi atoms with octahedra around mixed occupied metal positions (M = Ag/Bi) between them. Modules of type B are composed of [MZ6] octahedra, which are arranged in NaCl-type fragments of thickness N. All structures exhibit Ag/Bi disorder in octahedrally coordinated metal positions as well as Q/X mixed occupation of some anion positions. Corresponding to their black color, all compounds are narrow-gap semiconductors (Eg = 0.35 eV for (II)). General characteristics of the entire class of (N, x)P compounds are gathered in a catalogue." @default.
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- W4229697466 date "2008-03-01" @default.
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- W4229697466 title "Homologous Silver Bismuth Chalcogenide Halides(N, x)P. III. The(4, x)P,(5, x)P, and(7, x)P Structure Families of Modular Compounds with Tunable Composition and Structure" @default.
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- W4229697466 doi "https://doi.org/10.1002/zaac.200700454" @default.
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