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- W2039801306 abstract "Abstract The influences of particle size and specific surface area of Yb2O3 powders, sulfurization temperature and time and CS2 gas flow rate on preparation of ytterbium sesquisulfide (Yb2S3) were researched. Small particle size ( 2 m2/g) of Yb2O3 are necessary for fabrication of Yb2S3. Single orthorhombic η-Yb2S3 and hexagonal e-Yb2S3 were synthesized by the sulfurization of fine Yb2O3 powders at 700–800 °C and 1000–1050 °C with CS2 gas flow rate of 1.67 mL/s, respectively. Orthorhombic η-Yb2S3 transformed to hexagonal e-Yb2S3 with increase of temperature. In contrast, Yb2O2S always exists until 1050 °C when particle size of Yb2O3 is about 5 μm and specific surface area is 2 m2/g. Bigger specific surface area (50 m2/g) of Yb2O3 accelerated absorption rate of CS2 gas and then orthorhombic η-Yb2S3 was obtained at 600 °C for 8 h. Particle sizes of both orthorhombic η-Yb2S3 and hexagonal e-Yb2S3 are dependent on sulfurization conditions and impurity content. Phase transformation of orthorhombic-to-hexagonal Yb2S3 caused grain-size reduction of Yb2S3 by volume shrinkage. Specific surface area of synthetic Yb2S3 was measured to reflect the variation of particle size." @default.
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- W2039801306 date "2015-01-01" @default.
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- W2039801306 title "Influences of Yb2O3 characters and sulfurization conditions on preparation of Yb2S3" @default.
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- W2039801306 doi "https://doi.org/10.1016/j.jallcom.2014.08.109" @default.
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