Ferroelectric mesocrystals of bismuth sodium titanate: Formation mechanism, nanostructure, and application to piezoelectric materials

Dengwei Hu, Xingang Kong, Kotaro Mori, Yasuhiro Tanaka, Kazunari Shinagawa, Qi Feng

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Ferroelectric mesocrystals of Bi0.5Na0.5TiO 3 (BNT) with [100]-crystal-axis orientation were successfully prepared using a topotactic structural transformation process from a layered titanate H1.07Ti1.73O4·nH2O (HTO). The formation reactions of BNT mesocrystals in HTO-Bi2O 3-Na2CO3 and HTO-TiO2-Bi 2O3-Na2CO3 reaction systems and their nanostructures were studied by XRD, FE-SEM, TEM, SAED, and EDS, and the reaction mechanisms were given. The BNT mesocrystals are formed by a topotactic structural transformation mechanism in the HTO-Bi2O 3-Na2CO3 reaction system and by a combination mechanism of the topotactic structural transformation and epitaxial crystal growth in the HTO-TiO2-Bi2O3-Na 2CO3 reaction system, respectively. The BNT mesocrystals prepared by these methods are constructed from [100]-oriented BNT nanocrystals. Furthermore, these reaction systems were successfully applied to the fabrication of [100]-oriented BNT ferroelectric ceramic materials. A BNT ceramic material with a high degree of orientation, high relative density, and small grain size was achieved.

Original languageEnglish
Pages (from-to)10542-10551
Number of pages10
JournalInorganic chemistry
Volume52
Issue number18
DOIs
Publication statusPublished - Sep 16 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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