Polarization Reversal and Electrocaloric Measurements for Field-Enforced Transitions in the System Lead Zirconate-Lead Titanate-Lead Oxide: Tin Oxide

摘要

The Pb(Zr, Sn, Ti)O sub 3 crystalline solution series (PZST) has several phases of near equal free energy, allowing field-enforceable antiferroelectric (AFE) to ferroelectric (FE) and paraelectric (PE) to ferroelectric (FE) transitions. An understanding of the stability of FE, AFE, and PE phases with respect to chemical composition, electric field and temperature was developed from low frequency polarization vs electric field measurements at different temperatures. All materials studied had a sequence of phase transitions FE-AFE-PE with increasing temperature. The temperature range of AFE phase stability increased with increasing Zr/Ti ratio, while SnO sub 2 content increased the stability over a wider compositional range. Thus, through compositional modification, some materials were fabricated that had an AFE temperature range of stability of only 3 exp 0 C, while for others the temperature range of AFE phase stability was in excess of 100 exp 0 C. (ERA citation 07:057423)