Grain Size Dependence of High Power Piezoelectric Characteristics in Nb Doped Lead Zirconate Titanate Oxide Ceramics : Electrical Properties of Condensed Matter

概要

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The grain size dependence of high power piezoelectric properties and their variation upon heat generation for Nb doped lead zirconate titanate oxide (PZT)-based ceramics were investigated under high AC electric fields. The temperature rise was found to decrease linearly upon reduction in grain size and was about 40% lower for fine grained ceramic (0.9μm) compared to coarse grained one (3.0μm) near the maximum vibration velocity level (0.30 m/s) whereas coercive field displayed a linear increase upon lowering the grain size. Furthermore, a rise in vibration velocity and mechanical quality factor (Q_m) under low electric fields was found to correlate with decreasing grain size. Such a trend was explained in terms of the pinning effect of grain boundaries, which is observed to be critical for suppressing heat generation in high power ceramic applications.
社団法人応用物理学会の論文
2001-12-15