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A ceramic consisting of a dispersion of Zr02 particles (=25%) in zircon was prepared by sintering partially leached plasma dissociated zircon. ZrOz particles smaller than -150 nm 'were tetragonal in form; larger particles were monoclinic. The large increase in proportions of tetragonal ZrOz after sintering may be ascribed partly to a reduction in particle size by reaction to form zircon, and partly to a matrix effect on the tetragonal to monoclinic transformation.