论文标题
尼贝特铅镁的名义上千古放松状态的宏观极化
Macroscopic polarization in the nominally ergodic relaxor state of lead magnesium niobate
论文作者
论文摘要
研究了原始铅镁晶体晶体和陶瓷的名义上的巨像松弛阶段的宏观极性及其对外部电场和温度的动态反应，PB（MG1/3NB2/3）O3（PMN）。动态的载火测量为样品的持续宏观极性提供了证据。在极化样品的燃烧温度下方和高于燃烧的温度下进行了退火实验，将这种极性与极性纳米实体的存在及其动力学联系起来。宏观极化逆转所需的直流电场强度与动态非线性介电介电常数达到最大的AC场的幅度相似。因此，上述最大值与极性纳米实体的重新定位有关。结果疑问，在燃烧温度以下的PMN中存在千古状态。
Macroscopic polarity and its dynamic response to external electric fields and temperature in the nominally ergodic relaxor phase of pristine lead magnesium niobate crystals and ceramics, Pb(Mg1/3Nb2/3)O3 (PMN), were investigated. Dynamic pyroelectric measurements provide evidence for persistent macroscopic polarity of the samples. Annealing experiments below and above Burns temperature of polarized samples relate this polarity to the presence of polar nano entities and their dynamics. The dc electric field strength required for macroscopic polarization reversal is similar to the amplitude of the ac field where dynamic nonlinear dielectric permittivity reaches maximum. Consequently, the aforementioned maximum is related to the reorientation of polar nano entities. The results question the existence of an ergodic state in PMN below Burns temperature.
