Evaluation of domain wall motion during polymorphic phase transition in (K, Na)NbO3-based piezoelectric ceramics by nonlinear response measurements
Evaluation of domain wall motion during polymorphic phase transition in (K, Na)NbO3-based piezoelectric ceramics by nonlinear response measurements
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DOI：
10.1063/1.3553857
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发表时间：
2011-03
影响因子：
3.2
通讯作者：
B. Peng;Zhenxing Yue;Long-tu Li
中科院分区：
文献类型：
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作者：
B. Peng;Zhenxing Yue;Long-tu Li
在研究0.95（K0.5Na0.5）NbO 3 -0.05LiTaO3（KNN-0.05LT）压电陶瓷非线性介电响应的基础上，定量分析了畴壁不可逆运动对介电常数随温度变化的贡献。瑞利定律合理地解释了这些非线性介电行为，并成功地将不可逆畴壁运动的贡献从宏观介电性质中分离出来。在多晶型相变过程中，由于晶体结构和畴结构的变化，畴壁不可逆运动的非本征贡献（用瑞利系数（α）表示）急剧下降。在多晶型相变后的四方相区，介电非线性显著降低。此外，四方晶相比正交晶相更稳定。
Based on the investigation of the nonlinear dielectric response of 0.95(K0.5Na0.5)NbO3-0.05LiTaO3 (KNN-0.05LT) piezoelectric ceramics, the contribution of irreversible domain wall movement to the dielectric constant with increasing temperature were quantitatively evaluated. Rayleigh law reasonably interpreted these nonlinear dielectric behaviors and successfully separated the contribution of irreversible domain walls movement from the macroscopic dielectric properties. The extrinsic contribution from irreversible domain wall movement, denoted by the Rayleigh coefficient (α), undergoes an abrupt decline during the polymorphic phase transition due to the change of the crystal structure and the domain configuration. The dielectric nonlinearity is significantly reduced in the tetragonal phase zone after the polymorphic phase transition. Furthermore, the tetragonal phase is more stable than the orthorhombic phase.