Journal of the American Ceramic Society, Vol.101, No.11, 5281-5286, 2018
Origin of the intermediate phase in lead zirconate, PbZrO3
The so-called intermediate phase of pure PbZrO3 was investigated on a series of specimens by dielectric measurements and X-ray diffraction. The results indicate that neither defects nor impurities are the origin of the phase. Only in specimens with a low content of pseudocubic [0 0 1](c) domains does the intermediate phase appear on cooling. This preferred orientation suppresses the effect of out-of-phase oxygen octahedral rotations, which stabilize the antiferroelectric phase. As a result, the intermediate phase is present competitively in a narrow temperature range during cooling before the antiferroelectric phase transition.