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The monoclinic‐tetragonal transformation in ZrO 2 was studied by DTA. The reverse transformation occurs at 850° to 1000°C, depending on the crystallite size, which is a function of the experimental variables. Isothermal kinetics are exhibited by material containing small crystallites; athermal behavior begins to appear as the crystallite size increases. On cooling, strain‐free samples undergo a very rapid transformation which is evident as a burst.
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Maiti et al. (1972) studied this question.
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