Fabrication of [100]-oriented bismuth sodium titanate ceramics with small grain size and high density for piezoelectric materials

Dengwei Hu, Kotaro Mori, Xingang Kong, Kazunari Shinagawa, Satoshi Wada, Qi Feng

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

A layered titanate H1.07Ti1.73O4·nH2O (HTO) with a plate-like particle morphology was used as a template for the fabrication of [100]-oriented bismuth sodium titanate (Na0.5Bi0.5TiO3, or BNT) ceramics by a reactive-templated grain growth (RTGG) method. The oriented BNT ceramic with a high degree of orientation (95%), high density (98%), and small grain size (2μm) was fabricated for the first time by the RTGG method using a HTO-TiO2-Bi2O3-Na2CO3 reaction system. The oriented BNT ceramic is formed by a topotactic transformation reaction of plate-like HTO template particles to plate-like BNT mesocrystal particles, and then epitaxial crystal growth of BNT on the BNT mesocrystal particles. The epitaxial crystal growth reaction is affected by TiO2/HTO mole ratio, chemical component of the starting material, and calcination temperature program. The fabricated oriented BNT ceramic shows a higher d33* value than the non-oriented BNT ceramic, suggesting the promising application to high performance Pb-free piezoelectric materials.

Original languageEnglish
Pages (from-to)1169-1180
Number of pages12
JournalJournal of the European Ceramic Society
Volume34
Issue number5
DOIs
Publication statusPublished - May 1 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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