Etude calorimetrique et dilatometrique sous pression des transitions de phase de Pb(Zr0,965Ti0,035)O3 dope

The pressure—temperature phase diagram of the solid solution is drawn by calorimetric measurements. With temperature increasing the observed phase transitions are, according to the pressure: antiferroelectric, ferroelectric, paraelectric, or antiferroelectric, antiferroelectric, paraelectric. The heats of transition are measured and compared with those calculated using the Clausius—Clapeyron relationships for first-order transitions; the deviations observed at some phase transitions are discussed.