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Changes in transition temperature between ferroelectric and paraelectric states under the influence of an external alternating electric field and uniaxial mechanical stress have been investigated for PbZr x Ti1 - xO3 solid solutions with low Ti content. The results indicate a further anomaly of physical properties connected with the existence of a tricritical point in PbZr x Ti1 - xO3 in the vicinity of the value x = 0.94. The influence of electrostrictive coupling on the observed anomaly and the correlation between tricritical point and complex phase composition are discussed on the basis of data reported by various authors.
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Roleder et al. (1982) studied this question.
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