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Abstract
The perovskite structure solid solutions between antiferroelectric PbZrO3 and ferroelectric PbTiO3 embrace a number of technologically important piezoelectric compositions grouped near the morphotropic phase boundary (composition close to Zr:Ti ratio 1:1). Heats of transition Q(J/m3) and ferroelectric transition temperature Tc(K) for a series of carefully prepared (chemically coprecipitated) composition in the Pb(ZrxTi1-x)O3 solid solution system in the range 0.0 < x ≤ 0.6 were measured using a Perkin Elmer DSC2 thermal analyser under computer control. The composition dependence of the transition entropy S(J/m3/deg) and the Curie Weiss constant were deduced from a combination of calorimetric and phenomenological data. The anomalous behaviour of the heat of transition for compositions near the morphotropic boundary is discussed on the basis of an extended phenomenological theory for the PbZrO3:PbTiO3 system(1).
