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Linear calibration curves were developed for determining the content of free ZrO 2 in partially stabilized zirconia ceramics by X‐ray diffraction techniques. Two methods were studied. The matrix method, in which free ZrO 2 was considered to be distributed in a matrix (the cubic phase), gave approximately equal mass absorption coefficients for the monoclinic and cubic phases. The polymorph technique, in which the cubic phase was considered to be a polymorph of ZrO 2 and in which integrated intensities were used, gave the better results.
Garvie et al. (Thu,) studied this question.