PMZNT弛豫铁电陶瓷直流偏压下的介电非线性的研究

在一定温度范围内，对PMN－PZN－PT系弛豫铁电陶瓷直流偏压下的介电非线性进行了研究。结果表明，在较小的直流偏压场下，介电常数存在一个具有温度依赖性的最大值；在较大的直流偏压场下，介电常数大幅度降低。分别采用偶极子玻璃模型和多畴态模型对上述非线性现象进行了定性解释。

Study on Dielectric Nonlinearity of PMZNT Relaxor Ferroelectrics under DC Bias

The dielectric nonlinearity of the PMN-PZN-PT relaxor ferroelectric ceramics under DC bias was investigated. The results revealed that the bias characteristics of didectric constant showed a temperature - dependent peakat small bias levd. The dielectric constant decreased significantly under large DC bias level. The dipole glass model andmulti-domain state model were used to explain the DC bias field dependence of dielectric response respectively.