Glazounov AE, Tagantsev AK
Institute for Ceramics in Mechanical Engineering, University of Karlsruhe, D-76131 Karlsruhe, Germany.
Phys Rev Lett. 2000 Sep 4;85(10):2192-5. doi: 10.1103/PhysRevLett.85.2192.
A phenomenological model was proposed which describes frequency dispersion of nonlinear dielectric response of relaxor ferroelectrics (relaxors) as a result of dispersion of their linear dielectric permittivity. The model was applied to Pb(Mg(1/3)Nb(2/3))O3 (PMN) relaxor. It provided a good qualitative description of temperature and frequency dependence of the third harmonics of PMN. Analysis within the model yielded a frequency independent nonlinear coefficient corresponding to static nonlinear dielectric susceptibility. The model explained the recently reported for PMN data on the Vogel-Fulcher law for frequency dependence of the temperature at which the third harmonics passes a maximum.
提出了一种现象学模型，该模型描述了弛豫铁电体（弛豫体）非线性介电响应的频率色散是其线性介电常数色散的结果。该模型应用于Pb(Mg(1/3)Nb(2/3))O3（PMN）弛豫体。它对PMN三次谐波的温度和频率依赖性给出了很好的定性描述。在该模型内的分析得出了一个与静态非线性介电常数相对应的与频率无关的非线性系数。该模型解释了最近报道的PMN关于三次谐波达到最大值时温度的频率依赖性的Vogel-Fulcher定律的数据。
