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- W2073332067 abstract "The microstructure (via SEM, TEM and X-ray powder data), magnetic and optical colour parameters of the solid solution Ca1−xYb2/3x□1/3xS (with 0≤x≤1) were investigated. Several samples have been prepared by heating mixtures of CaS and Yb2S3 (white and yellow colour, respectively) in sealed silica tubes and by sulphurating the amorphous precursors of both metals in a H2S+Ar steam in CS2. Scanning electron micrographs show small particle size, up to 5 μm, in the second preparation samples. All the samples are bluish-green coloured and suitable for pigment applications. For x≈0.11, the cation vacancies (produced during the process 3Ca2+→2Yb3++?) are randomly distributed and a decrease in the NaCl-type unit cell volume of 1% was observed accompanied by cluster formation in the image. For x=0.33, we observed a cubic superstructure of NaCl-type, with a=2a0=11.280(3) Å; a0=5.50 Å for pure CaS. Higher x values give mixtures of two phases: (a) rhombohedral symmetry, ar=7.987(6) Å and α=58.6 (°), and (b), orthorhombic Yb3S4-type, with a=12.641(8) Å, b=3.844(4) Å and c=13.01(1) Å." @default.
- W2073332067 created "2016-06-24" @default.
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- W2073332067 date "2001-07-01" @default.
- W2073332067 modified "2023-10-18" @default.
- W2073332067 title "New ecological pigments in the Ca–Yb–S system" @default.
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- W2073332067 doi "https://doi.org/10.1016/s0925-8388(01)01118-5" @default.
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