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Creation and Destruction of Morphotropic Phase Boundaries through Electrical Poling: A Case Study of Lead-Free (Bi1/2Na1/2)TiO3-BaTiO3 Piezoelectrics
Physical Review Letters
  • Cheng Ma, Iowa State University
  • Hanzheng Guo, Iowa State University
  • Scott P. Beckman, Iowa State University
  • Xiaoli Tan, Iowa State University
Document Type
Article
Publication Date
9-7-2012
DOI
10.1103/PhysRevLett.109.107602
Abstract
We report the first direct evidence that the morphotropic phase boundary in ferroelectric materials, along with the associated strong piezoelectricity, can be created, destroyed, or even replaced by another morphotropic phase boundary through phase transitions during electrical poling. The real-time evolution of crystal structure and domain morphology during the poling-induced phase transitions in (Bi1/2Na1/2)TiO3-BaTiO3 is observed with in situ transmission electron microscopy. These observations elucidate the microstructural origin of the macroscopic piezoelectricity’s dependence on the poling field and previously unexplained strain behaviors. This study demonstrates that the ferroelectric-to-ferroelectric transitions during the poling process can completely alter the morphotropic phase boundaries and, hence, must be comprehensively investigated when interpreting the microscopic mechanism of macroscopic piezoelectric behaviors.
Comments

This article is from Physical Review Letters 109 (2012): 107602, doi:10.1103/PhysRevLett.109.107602. Posted with permission.

Copyright Owner
American Physical Society
Language
en
Date Available
2013-11-21
File Format
application/pdf
Citation Information
Cheng Ma, Hanzheng Guo, Scott P. Beckman and Xiaoli Tan. "Creation and Destruction of Morphotropic Phase Boundaries through Electrical Poling: A Case Study of Lead-Free (Bi1/2Na1/2)TiO3-BaTiO3 Piezoelectrics" Physical Review Letters Vol. 109 Iss. 10 (2012) p. 10760
Available at: http://works.bepress.com/xiaoli_tan/9/