TEXTURING OF PMN-PT CERAMICS VIA TEMPLATED GRAIN GROWTH (TGG): ISSUES AND PERSPECTIVES

摘要

The issues in texturing of PMN-PT ceramics by Templated Grain Growth (TGG) are discussed. TGG is a technique to make grain oriented ceramics with high anisotropy properties in lower cost. In recent years, extensive researches are focused on obtaining higher microstructural orientation. High d_(33) (1100-1600 pC/N) in low field and high strain (>0.3% at 50 kV/cm) were reported. Nevertheless, the technique still faces some problems in achieving high and reliable piezoelectric properties. High aspect ratio strontium titanate (ST) and barium titanate (BT) are synthesized and incorporated in PMN-35PT matrix. High Lotgering factors (～70%) were obtained. Synthesis of calcium titanate (CT) was also studied. Principles and developments of viable high isometric perovskite templates and the perspective of the TGG technique for texturing of PMN-PT are presented. Finally, fluctuations in piezoelectric properties of sintered samples are discussed in terms of compositional and microstructural aspects.