Abstract
The phase transition sequence in PbZrO3-based ceramics can be readily altered by chemical modification. In Pb0.99Nb0.02[(Zr0.57Sn0.43)0.92Ti0.08]0.98O3 (PNZST 43/8/2), the sequence is ferroelectric–antiferroelectric–paraelectric during heating, while in Pb0.99Nb0.02(Zr0.85Sn0.13Ti0.02)0.98O3 (PNZST 13/2/2), it is antiferroelectric–ferroelectric–paraelectric during heating. The electrocaloric effect associated with the antiferroelectric ↔ ferroelectric phase transition is studied in both ceramics via indirect measurement. PNZST 43/8/2 is observed to display a positive electrocaloric effect; in contrast, PNZST 13/2/2 exhibits a negative effect.
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