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首页> 外文期刊>Ferroelectrics: Letters Section >Field-Cooled-Zero-Field-Heated and Zero-Field-Heated Dielectric Behaviors of (Pbmg_(1/3)Nb_(2/3)O_3)_(0.67)(PbTiO_3)_(0.33) Single Crystal
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Field-Cooled-Zero-Field-Heated and Zero-Field-Heated Dielectric Behaviors of (Pbmg_(1/3)Nb_(2/3)O_3)_(0.67)(PbTiO_3)_(0.33) Single Crystal

机译：（Pbmg_（1/3）Nb_（2/3）O_3）_（0.67）（PbTiO_3）_（0.33）单晶的场冷零场加热和零场加热介电行为

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摘要

Temperature and frequency dependent dielectric measurements in the relaxor ferroelectric single crystal (Pbmg_(1/3)Nb_(2/3)O_3)_(0.67)(PbTiO_3)_(0.33) (PMN-33 percent Pr) are reported for measured fields along the [001] direction. A sharp phase transition (cubic paraelectric phase ?tetragonal ferroelectric phase) was observed near 420 K and 425 K for the zero-field-heated and field-cooled-zero-field-heated runs, respectively. The field-cooled-zero-field-heated dielectric permittivities show that the dc bias field induces a long-range ferroelectric phase transition at 357 K. In addition, the dielectric data #epsilon#"_c(f, T) taken from the field-cooled-zero-field-heated process, imply the phase coexistence of a short-range ordering (which is attributed to the local structural fluctuations between rhombohedral and tetragonal symmetries) and a long-range ordering due to macro-domain pinning in the region of approx 330-380 K.
机译：报告了弛豫铁电单晶（Pbmg_（1/3）Nb_（2/3）O_3）_（0.67）（PbTiO_3）_（0.33）（PMN-33％Pr）中随温度和频率变化的介电测量沿[001]方向。对于零场加热的和零场加热的零场，分别在420 K和425 K附近观察到了尖锐的相变（立方顺电相？四方铁电相）。场冷零场加热的介电常数表明，直流偏置场在357 K处引起长距离铁电相变。此外，从场获取的介电数据#epsilon＃“ _ c（f，T）冷却零场加热过程，意味着短程有序（归因于菱形和四边形对称性之间的局部结构波动）和长程有序的共存约330-380K。

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