Abstract
Nanocrystalline microwave dielectrics ZnTiO 3 and Zn 2TiO 4 (spinel) phase have been prepared by high-energy ball milling the powder mixture of ZnO and anatase ( a)-TiO 2. Ball milling of equimolar powder mixture of ZnO and a-TiO 2 is continued up to 6 h with some intermediate milling steps. Microstructure of all the samples is characterized by Reitveld's structure refinement method using X-ray powder diffraction data. Mixture of nanocrystalline ZnTiO 3 and Zn 2TiO 4 is noticed to form after 6 h of ball milling. Within 30 min of milling formation of Zn 2TiO 4 is noticed in the X-ray diffraction pattern whereas the formation of ZnTiO 3 starts after 2 h of ball milling. The formation mechanism, phase transition kinetics, structure and microstructure changes in terms of lattice imperfections and relative phase abundances of individual phases have been estimated from the analysis of X-ray powder diffraction data of unmilled and ball-milled samples by Rietveld's powder structure refinement method.
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