Morphotropic phase boundary(MPB)containing piezoelectric systems generally exhibit enhanced piezoelectric performance at compositions within,or close to,the MPB region.The mechanism/s underlying such enhancement,howev...Morphotropic phase boundary(MPB)containing piezoelectric systems generally exhibit enhanced piezoelectric performance at compositions within,or close to,the MPB region.The mechanism/s underlying such enhancement,however,are still contentious due to complex micro/nanostructure and apparently inherent local structural variability associated with octahedral tilt disorder/platelet precipitates in such piezoelectric materials.This paper reviews some recent structural analysis results from Bi_(0.5)Na_(0.5)TiO_(3)(BNT)and other binary,lead-free,piezoelectric materials systems derived from it via electron diffraction and in situ neutron diffraction.The results suggest that intrinsically existing local microstructure(LMS)in BNT essentially continues across the MPB region.The LMS,originating from inherent octahedral tilt disorder,is strongly temperature-,electric field-,pressure-and chemical composition-dependent,and may help to explain a series of phenomena observed in BNT-based binary materials systems,including the enhanced piezoelectric effect in the region of the MPB.展开更多
基金the financial support from the Australian Research Council(ARC)in the form of ARC Discovery Grantssupport via the CAS/SAFEA International Partnership Program for Creative Research Teams.
文摘Morphotropic phase boundary(MPB)containing piezoelectric systems generally exhibit enhanced piezoelectric performance at compositions within,or close to,the MPB region.The mechanism/s underlying such enhancement,however,are still contentious due to complex micro/nanostructure and apparently inherent local structural variability associated with octahedral tilt disorder/platelet precipitates in such piezoelectric materials.This paper reviews some recent structural analysis results from Bi_(0.5)Na_(0.5)TiO_(3)(BNT)and other binary,lead-free,piezoelectric materials systems derived from it via electron diffraction and in situ neutron diffraction.The results suggest that intrinsically existing local microstructure(LMS)in BNT essentially continues across the MPB region.The LMS,originating from inherent octahedral tilt disorder,is strongly temperature-,electric field-,pressure-and chemical composition-dependent,and may help to explain a series of phenomena observed in BNT-based binary materials systems,including the enhanced piezoelectric effect in the region of the MPB.
