Monoclinic structure of unpoled morphotropic high piezoelectric PMN-PT and PZN-PT compounds
Monoclinic structure of unpoled morphotropic high piezoelectric PMN-PT and PZN-PT compounds
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DOI：
10.1103/physrevb.65.064106
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发表时间：
2002-02-01
影响因子：
3.7
通讯作者：
Calvarin, G
中科院分区：
文献类型：
--
作者：
Kiat, JM;Uesu, Y;Calvarin, G
用中子Rietveld分析证明了未极化的（PbMg_（1/3）Nb_（2/3）O_3）（1-x）-（PbTiO_3）（x）（x= 0.35（PMN-PT 35%））和未极化的（PbZn_（1/3）Nb_（2/3）O_3）（1-x）-（PbTiO_3）（x）（x=0.09（PZN-PT 9%）中存在单斜相。该单斜相不同于最近由Noheda及其同事在PhZr 1-xTixO 3（x=0.48 [B. Noheda等人，物理修订版B。61，8687（2000）]，但与在x=0.08的极化PZN-PT中观察到的相位相同[B. Noheda等人物理修订信函86，3891（2001）]。结构分辨率使我们能够比较两种结构，并推断出偏振的方向和幅度。在PMN-PT 35%和PZN-PT 9%中，该相的特征在于弱极化值、强氧多面体变形和弱阳离子位移。
Evidences of a monoclinic phase in unpoled (PbMg1/3Nb2/3O3)(1-x)-(PbTiO3)(x) with x= 0.35 (PMN-PT 35%) and unpoled (PbZn1/3Nb2/3O3)(1-x)-(PbTiO3)(x) with x=0.09 (PZN-PT 9%) are presented from a neutron Rietveld analysis. This monoclinic phase is different from the phase recently evidenced by Noheda and co-workers in PhZr1-xTixO3 with x=0.48 [B. Noheda et al., Phys. Rev. B. 61, 8687 (2000)] but is identical to the phase observed in poled PZN-PT with x=0.08 [B. Noheda et al.. Phys. Rev. Lett. 86, 3891 (2001)] by the same authors. The structural resolutions allowed us to compare both structures and to deduce the direction and magnitude of polarization. In PMN-PT 35% and PZN-PT 9% this phase is characterized by a weak value of polarization, a strong deformation of oxygen polyhedra, and weak cationic shifts.