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首页> 外文期刊>Optical Materials >Characterization of lead-based relaxor ferroelectric crystals by acoustic emission
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Characterization of lead-based relaxor ferroelectric crystals by acoustic emission

机译：通过声发射表征铅基弛豫铁电晶体

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摘要

The acoustic emission (AE) method is presented as a useful complementary tool for nondestructive characterization of selective relaxor ferroelectrics. Combined measurements of the dielectric permittivity and AE activity as a function of temperature and externally applied electric fields have been carried out using Pb(Mg_(1/3)Nb_(2/3))O_3-33%PbTiO_3 (PMN-0.33PT) single crystals and Pb(Sc_(0.5)Ta_(0.5))O_3 (PST) single crystals. Anomalous behavior in the electric field dependencies of the characteristic temperatures, T_m (diffuse permittivity maximum in PMN-PT) and T_n (formation of incommensurate antiferroelectric domains in PST), and the associated AE intensities has been observed. Both T_m and T_n exhibit minima coinciding with the AE activities maxima at critical values of the applied dc electric fields, 0.5 and 0.13 kV respectively. These phenomena are discussed mainly in terms of the interaction of the external field with the random electric fields originating from the polar nanoregions in relaxor ferroelectrics.
机译：声发射（AE）方法作为一种有用的补充工具，用于选择性张弛铁电体的非破坏性表征。使用Pb（Mg_（1/3）Nb_（2/3））O_3-33％PbTiO_3（PMN-0.33PT）进行介电常数和AE活性随温度和外部施加电场的组合测量单晶和Pb（Sc_（0.5）Ta_（0.5））O_3（PST）单晶。特征温度的电场依赖性T_m（PMN-PT中的最大扩散介电常数）和T_n（PST中不相称的反铁电畴的形成）以及相关的AE强度在电场中的异常行为已被观察到。在施加的直流电场的临界值（分别为0.5和0.13 kV）下，T_m和T_n都显示出与AE活性最大值一致的最小值。这些现象主要是根据外电场与弛豫铁电中极性纳米区域产生的随机电场的相互作用来讨论的。

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