图4 a 15R和15T陶瓷在30 kVcm电场下的P-E电滞回线；b 15R和15T陶瓷在30 kVcm电场下的双极S-E应变曲线；c xR和xT陶瓷的的d33随组分变化图；d多种压电陶瓷的d33、εT33、g33和d33·g33统计图R-ZST-ZS随机取向织构化NN-10BT-375ZS；R-NST-NS随机取向织构化NN-10BTS-15NS翻译

Figure 4 a shows the P-E hysteresis loops of 1.5R and 1.5T ceramics under a 30 kV/cm electric field, while Figure 4 b shows the bipolar S-E strain curves of 1.5R and 1.5T ceramics under the same electric field. Figure 4 c shows the variation of d33 with composition for xR and xT ceramics, and Figure 4 d presents statistical graphs of d33, εT33, g33, and d33·g33 for various piezoelectric ceramics (R-ZS/T-ZS: randomly oriented/textured NN-10BT-3.75ZS; R-NS/T-NS: randomly oriented/textured NN-10BTS-1.5NS).