Premium
Domain Structure Evolutions During the Poling Process for [011]‐Oriented PMN– x PT Crystals Across the MPB Region
Author(s) -
Xu Chao,
Li Qiang,
Yan Qingfeng,
Luo Nengneng,
Zhang Yiling,
Chu Xiangcheng
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14226
Subject(s) - poling , tetragonal crystal system , phase boundary , piezoelectricity , materials science , phase diagram , phase (matter) , condensed matter physics , crystallography , crystal structure , dielectric , ferroelectricity , chemistry , composite material , physics , optoelectronics , organic chemistry
The poling effect on the [011]‐oriented (1− x )Pb(Mg 1/3 Nb 2/3 )O 3 ‐ x PbTiO 3 (PMN– x PT) single crystals across the morphotropic phase boundary ( MPB ) was studied. The dielectric and piezoelectric properties were investigated as a function of the poling field. Domain structure evolutions during the poling process were recorded. In the unpoled PMN– x PT phase diagram, an apparent rhombohedral (R)‐tetragonal (T) phase boundary exists. With room‐temperature poling, the structure transformation sequence strongly depends on the composition. The crystal experiences a direct transition to the 2R/2T domain state in the rhombohedral or tetragonal phase field beyond the MPB region, whereas within the MPB zone it is hard to achieve the 2R/2T engineered configuration although the initial state is either rhombohedral or tetragonal as well. The piezoelectric responses of the MPB·PMN– x PTs are extraordinary weak ( d 33 ~ 250 pC/N), in contrast to the [011]‐oriented multidomain PMN– x PTs with ultrahigh‐piezoelectric coefficient ( d 33 > 1000 pC/N). We demonstrate that a slight composition variation near the MPB will significantly influence the domain evolution route and piezoelectricity for the [011]‐oriented PMN– x PT crystals. We also confirm the feasibility to realize the 2R/2T engineered domain configuration for the [011]‐oriented MPB crystals, which will extend the desired portion of the Bridgeman‐grown boules with optimal piezoelectric properties.