Abstract
Abstract The synthesis of ultrafine zirconia powders by mechanochemical reaction of ZrCl 4 with CaO has been investigated using x-ray diffraction, TEM and DSC measurements. Mechanical milling resulted in a nanoscale mixture of CaO and amorphous ZrCl 4 . with no evidence of any reaction having occurred. Subsequent heat treatment at temperatures above 300 °C resulted in the formation of separated particles of cubic ZrO 2 ,5–10 nm in diameter, within an CaCl 2 matrix. Measurements of the effect of particle size on the crystal structure of ZrO 2 are also reported.
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