Microstructure of batiO 3bi(Mg 1/2Ti 1/2)O 3-bifeo3 piezoelectric ceramics

Hisato Yabuta, Mikio Shimada, Takayuki Watanabe, Jumpei Hayashi, Makoto Kubota, Kaoru Miura, Tetsuro Fukui, Ichiro Fujii, Satoshi Wada

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Abstract

The dependence of the ferroelectric and piezoelectric properties of (1- x)(0.33BaTiO 3-0.67BiFeO 3)-xBi(Mg 1/2Ti 1/2)O 3 (x= 0, 0.05, 0.10, and 0.15) on Bi(Mg 1/2Ti 1/2)O 3 content x associated with microstructural changes is studied. From the behaviour of electric field-induced polarization and strain, polarization switching and depolarizing become easier as Bi(Mg 1/2Ti 1/2)O 3 content x increases. Remanent polarization and dielectric constant decrease, while polarization saturation field increases with increasing x. Microstructural observation reveals that Bi(Mg 1/2Ti 1/2)O 3 addition enhances the compositional fluctuation of BaTiO 3/BiFeO 3 ratio, which probably creates a nanometre-sized domain region with slightly BaTiO 3-rich composition. Since this nanometre-sized domain may cause relatively large responses of polarization and strain to the applied electric field, an appropriate amount of Bi(Mg 1/2Ti 1/2)O 3 enhances the electric field-induced strain, resulting in the largest piezoelectric response at x = 0:05. However, excessive Bi(Mg 1/2Ti 1/2)O 3 degrades polarization and strain characteristics, because a number of Ba(Fe1x - Mgx=2Tix=2)12O19 grains are created as a secondary phase and cause the segregation of excess bismuth oxide phases with low dielectric constant into the boundaries of the ferroelectric/piezoelectric grains.

Original languageEnglish
Article number09LD04
JournalJapanese journal of applied physics
Volume51
Issue number9 PART 2
DOIs
Publication statusPublished - Sep 1 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Yabuta, H., Shimada, M., Watanabe, T., Hayashi, J., Kubota, M., Miura, K., ... Wada, S. (2012). Microstructure of batiO 3bi(Mg 1/2Ti 1/2)O 3-bifeo3 piezoelectric ceramics. Japanese journal of applied physics, 51(9 PART 2), [09LD04]. https://doi.org/10.1143/JJAP.51.09LD04