Synthesis and Characterization of Tungsten (W) Nano Particles

• Main Authors: E Purushotham, N Gopi Krishna
• Format: Article
• Language: English
• Published: Eastern Macedonia and Thrace Institute of Technology 2014-04-01
• Series: Journal of Engineering Science and Technology Review
• Subjects: X-ray diffraction; lattice strain; crystallite size; Debye-Waller factor; vacancy formation energy
• Online Access: http://www.jestr.org/downloads/Volume7Issue1/fulltext77114.pdf

Crystallite size and lattice strains in tungsten (W) powders produced by milling have been analyzed by X-ray powder diffraction. The lattice strain (ε) and Debye-Waller factor (B) are determined from the half-widths and integrated intensities of the Bragg reflections. In W the Debye-Waller factor is found to increase with the lattice strain. From the correlation between the strain and effective Debye-Waller factor, the Debye-Waller factors for zero strain have been estimated for W. In the present work, Hall-Williamson method for particle size/crystallite size estimation of high energy milled W nano powder. The variation of energy of vacancy formation as a function of lattice strain has been studied.