弛豫铁电体中的Vogel-Fulcher冻结
Vogel-Fulcher freezing in relaxor ferroelectrics
摘要：
提出了弛豫铁电体中极性纳米区冻结的物理机制。假设活化能的一个集群的PNR的重定向规模与集群的平均体积，特征弛豫时间$τ$被发现发散的集群体积达到逾渗极限。应用连续渗流的平均场论，导出了$τ$温度依赖性的Vogel-Fulcher方程。
英文摘要：
A physical mechanism for the freezing of polar nanoregions (PNRs) in relaxor ferroelectrics is presented. Assuming that the activation energy for the reorientation of a cluster of PNRs scales with the mean volume of the cluster, the characteristic relaxation time $τ$ is found to diverge as the cluster volume reaches the percolation limit. Applying the mean field theory of continuum percolation, the familiar Vogel-Fulcher equation for the temperature dependence of $τ$ is derived.
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