Abstract
Dielectric properties of (1-x)Pb(Sc1/2Ta1/2)O3(PST)–xPbZrO3 (PZ) (0<x<1) were investigated. For PZ concentrations x<0.7, a diffuse phase transition was observed. With increasing x, the maximum permittivity εrm′ increased, and the temperature Tm at which εrm′ appeared shifted towards the higher temperature region. For x>0.7, the permittivity εr′ exhibits a peak at the phase transition temperature Tc. With increasing x, the peak value decreased and Tt shifted towards the higher temperature region. The phase below Tc was confirmed to be ferroelectric by observation of P-E hysteresis loops. Phase transformation from the relaxor to the ferroelectric state occurred at x=0.7. For x>0.8, a steplike anomaly appeared at Tt below Tc. With increasing x, Tt shifted towards the higher temperature region. There was a structural change characterized by the splitting of the structure-sensitive maximum of the (200) reflection of XRD patterns, similar to orthorhombic PZ, around x=0.8. Two morphotropic phase boundaries were found: one between the pseudocubic and rhombohedral phases with εrm′ of 15000 at 100 kHz was at x=0.7, and the other between the rhombohedral and orthorhombic phases was at x=0.8.
Published Version
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