Abstract
High-energy ball-milling of monoclinic (m) ZrO 2–anatase (a)TiO 2 mixture (3:2 molar ratio) at room temperature results in partial formation of nanocrystalline orthorhombic ZrTiO 4 phase after 8 h of milling. ZrTiO 4 phase is formed from the high pressure srilankite (s)-TiO 2 based TiO 2–ZrO 2 solid-solution. In-situ high temperature annealing of ZrTiO 4, m-ZrO 2 and a-TiO 2 powder mixture results in complete transformation of ZrTiO 4 at 1073 K. Microstructure characterization of the ball-milled and in-situ annealed samples in terms of several lattice imperfections is made employing the Rietveld’s method of structure refinement using X-ray powder diffraction data. Phase transformation kinetics and in addition to microstructure parameters, relative phase abundances of different phases are revealed from the Rietveld analysis. The analysis reveals that the ZrTiO 4 is formed from the isostructure s-TiO 2 based TiO 2–ZrO 2 solid-solution with ∼11 nm particle size after annealing at 1073 K.
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