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Your search keyword '"Gu, Yunle"' showing total 2 results
Start Over Author "Gu, Yunle" Topic c. x-ray diffraction Topic optical diffraction
2 results on '"Gu, Yunle"'

1. A facile one-step route to nanocrystalline TiB2 powders

Author

Chen, Luyang, Gu, Yunle, Qian, Yitai, Shi, Liang, Yang, Zeheng, and Ma, Jianhua

Subjects
*NANOCRYSTALS, *TITANIUM diboride, *CHEMICAL reactions, *X-rays, *OPTICAL diffraction
Abstract

Nanocrystalline titanium diboride (TiB2) has been prepared by the reaction of TiCl4 with NaBH4 in the temperature range of 500–700 °C in an autoclave. X-ray powder diffraction (XRD) patterns can be indexed as hexagonal TiB2 with the lattice constants of a=3.032 and c=3.229 A˚. Transmission electron microscopy (TEM) image shows particle morphology, with average size of 15 nm for the powder obtained at 600 °C. Selected area electron diffraction (SAED) pattern confirms the prepared hexagonal TiB2. The oxidation behavior of TiB2 is studied by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). [Copyright &y& Elsevier]

Published
2004
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2. Synthesis of nanocrystalline Mo2C via sodium co-reduction of MoCl5 and CBr4 in benzene

Author

Gu, Yunle, Li, Zhefeng, Chen, Luyang, Ying, Yongchen, and Qian, Yitai

Subjects
*MOLYBDENUM, *CARBON, *ELECTRON microscopy, *OPTICAL diffraction, *BENZENE
Abstract

Molybdenum carbide (Mo2C) has been synthesized via a sodium co-reduction of molybdenum pentachloride (MoCl5) and carbon tetrabromide (CBr4) in benzene at 350 °C for 12 h. X-ray diffraction (XRD) pattern indicated that the product was mainly hexagonal Mo2C with a small amount of cubic Mo2C. The lattice constants of the hexagonal Mo2C were a=3.009 and c=4.736 A˚. Transmission electron microscopy (TEM) study showed that the product consisted of slightly conglomerated particles of about 30 nm in size. [Copyright &y& Elsevier]

Published
2003
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