Abstract
Phase transformation induced by temperature of stannate-modified lead zirconate titanate ferroelectric ceramics was investigated. The chosen composition is Pb0.99Nb0.02[(Zr0.90Sn0.10)0.95Ti0.05]0.98O3 which was abbreviated as PZST85/10/5–2Nb. The low temperature rhombohedral ferroelectric (FR(LT))-high temperature rhombohedral ferroelectric (FR(HT))-paraelectric phase (PE) sequence induced by temperature was observed in poled PZST85/10/5–2Nb ceramic by measuring the dielectric response, hysteresis loop and piezoelectric coefficient d33. There was a relatively slight change of loss factor, hysteresis loop (remanent polarization, coercive field and area of loop) and piezoelectric constant d33 during FR(LT)-FR(HT) phase transformation. Sharp maxima of dielectric constant and piezoelectric constant d33 occur in FR(HT)-PE phase transformation.
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