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Calcia stabilized zirconia (CSZ) is destabilized by Al2O3, SiO2 and TiO2 at elevated temperatures. The product of destabilization, termed partially destabilized zirconia (PDZ) has been found to possess excellent resistance to thermal shock. The thermomechanical properties of PDZ depend, to a great extent, on the degree of destabilization which is the amount (in weight percent) of free ZrO2 formed as a consequence of the destabilization reaction. The kinetics of the destabilization reaction has been studied by quantitative X-ray powder diffraction technique, and from the kinetic data, the optimum amount of the destabilizer required to get superior quality PDZ has been estimated.