Characterization of W2B Nanocrystals Synthesized by Mechanochemical Method

Authors : Mustafa Barış, Tuncay Şimşek, Hakan GÖKMEŞE, Adnan AKKURT

Pages : 45-51

View : 27 | Download : 6

Publication Date : 2016-03-24

Article Type : Other Papers

Abstract :In this study; W 2 B nanocrystals were synthesized with B 2 O 3 /Mg/WO 3 starting materials via mechanochemical method. Starting materials were mixed according to the reaction stoichiometry and reduction processes were performed in a planetary ball mill under Argon gas atmosphere. Phase and morphology structure of particles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy with energy-dispersive X-ray spectroscopy (TEM/EDX) and the specific surface area was measured by Brunauer-Emmet-Teller (BET) theory. The effect of milling period and molar ratios of starting powders were investigated in detail. Results showed that W 2 B nanocrystals were obtained successfully without different tungsten compounds after 30 h milling and purification in 2 M HCl solution. Coaxial/spherical shaped and agglomerated W 2 B nanocrystals were observed by microstructural examinations. Crystallite size and specific surface area of the W 2 B nanocrystals were determined as 13.61 nm and 18 m 2 /g respectively.
Keywords : Ball milling, mechanochemical synthesis, nanocrystals, W2B