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- W2030031911 abstract "The microwave dielectric CaZrO 3 has been prepared in nanocrystalline form by high-energy ball milling an equimolar powder mixture of CaO and monoclinic ( m ) ZrO 2 . The formation of CaZrO 3 is noticed in the X-ray diffraction pattern of 2 h ball-milled powder. At the early stage of milling, up to 4 h, the weight fraction of CaZrO 3 increases rapidly and then slowly reaches almost the saturation value of ∼73 wt% within 18 h of milling. It is observed that in the course of milling, the weight fraction of c -ZrO 2 increases continuously from its starting value, ∼2.5 wt%, to ∼43 wt% within 2 h of milling, and then reduces slowly to its starting value. It seems that the c -ZrO 2 phase has been stabilized by CaO and takes part in the formation of CaZrO 3 by mechanochemical reaction of nanocrystalline CaO and c -ZrO 2 crystallites. However, post-annealing of 2, 6 and 18 h ball-milled samples results in the formation of ∼95 wt% CaZrO 3 phase. 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, ball-milled and post-annealed samples by Rietveld powder structure refinement." @default.
- W2030031911 created "2016-06-24" @default.
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- W2030031911 date "2005-03-11" @default.
- W2030031911 modified "2023-10-17" @default.
- W2030031911 title "X-ray microstructure characterization of ball-milled nanocrystalline microwave dielectric CaZrO<sub>3</sub>by Rietveld method" @default.
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- W2030031911 doi "https://doi.org/10.1107/s0021889804034351" @default.
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