Pressure Induced Phase Transformation of Pb(Zr(0.95)Ti(0.05))O(3) Based Ceramics: Grain Size Dependence;Journal of th eamerican Ceramic Society

摘要

A substantial decrease in hydrostatic ferroelectric (FE) to antiferroelectric (AFE) transformation pressure was measured for Pb(Zr0.949Ti0.051)0.989Nb0.0182O3 ceramics with decreasing grain size. The 150 Mpa decrease in hydrostatic FE to AFE transformation pressure over the grain size range of 8.5 mu m to 0.7 mu m was shown to be consistent with enhanced internal stress with decreasing grain size. Further, the Curie Point decreased and the dielectric constant measured at 25 degrees C increased with decreasing grain size. All three properties: dielectric constant magnitude, Curie point shift, and Fe to AFE phase transformation pressure were shown to be semi-quantitatively consistent with internal stress differences on the order of 100 Mpa. Calculations of Curie point shifts from the Clausius-Clapeyron equation, using internal stress levels derived from the hydrostatic depoling characteristics, were consistent with measured values.