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弛豫型铁电单晶Pb(Mg1 /3 Nb2 /3)O3_PbTiO3[PMNT]的电畴结构与铁电性能随组分变化 :由纯PMN至PMNT6 7/33晶体 ,晶体铁电性能由弛豫型铁电体向正常铁电体方向转变 ,电畴结构由微畴—不规则宏畴—规则宏畴演化 ,压电性能逐步增强 .电畴类型的转化也可由电场和温度诱导 .三方相PMNT晶体 (0 0 1)与 (111)切型晶片在极化后仍维持多畴态 ,它们在压电性能上的差异可从畴壁运动与两相共存方面获得解释 .尽管受晶体组分与结构起伏的影响 ,电畴分布的不均匀性在退火与极化前后始终存在 ,但晶体生长后期的退火处理与极化条件的改善对调节电畴结构、提高压电性能仍有一定效应 .
The domain structure and ferroelectric properties of the relaxed ferroelectric Pb (Mg1 / 3Nb2 / 3) O3_PbTiO3 [PMNT] vary with composition: from pure PMN to PMNT6 7/33, the ferroelectric properties of the crystal are determined by relaxation Type ferroelectric to normal ferroelectrics direction, the domain structure evolves from micro-domain-irregular macro-domain to regular macro-domain, and the piezoelectric properties are gradually enhanced.The transformation of domain type can also be induced by the electric field and the temperature. Crystalline (0 0 1) and (111) -cut wafers remain multidoped after polarization and their differences in piezoelectric properties can be explained in terms of domain wall motion and coexistence of both phases. However, the annealing treatment and the improvement of polarization conditions in the late stage of crystal growth have some effect on adjusting the domain structure and improving the piezoelectric properties.