Enhancement of tetragonal anisotropy and stabilisation of the tetragonal phase by Bi/Mn-double-doping in BaTiO 3 ferroelectric ceramics

Hisato Yabuta, Hidenori Tanaka, Tatsuo Furuta, Takayuki Watanabe, Makoto Kubota, Takanori Matsuda, Toshihiro Ifuku, Yasuhiro Yoneda

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Abstract

To stabilise ferroelectric-Tetragonal phase of BaTiO 3, the double-doping of Bi and Mn up to 0.5 mol% was studied. Upon increasing the Bi content in BaTiO 3:Mn:Bi, the tetragonal crystal-lattice-constants a and c shrank and elongated, respectively, resulting in an enhancement of tetragonal anisotropy, and the temperature-range of the ferroelectric tetragonal phase expanded. X-ray absorption fine structure measurements confirmed that Bi and Mn were located at the A(Ba)-site and B(Ti)-site, respectively, and Bi was markedly displaced from the centrosymmetric position in the BiO 12 cluster. This A-site substitution of Bi also caused fluctuations of B-site atoms. Magnetic susceptibility measurements revealed a change in the Mn valence from +4 to +3 upon addition of the same molar amount of Bi as Mn, probably resulting from a compensating behaviour of the Mn at Ti 4+ sites for donor doping of Bi 3+ into the Ba 2+ site. Because addition of La 3+ instead of Bi 3+ showed neither the enhancement of the tetragonal anisotropy nor the stabilisation of the tetragonal phase, these phenomena in BaTiO 3:Mn:Bi were not caused by the Jahn-Teller effect of Mn 3+ in the MnO 6 octahedron, but caused by the Bi-displacement, probably resulting from the effect of the 6 s lone-pair electrons in Bi 3+.

Original languageEnglish
Article number45842
JournalScientific reports
Volume7
DOIs
Publication statusPublished - Apr 3 2017

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stabilization
ceramics
anisotropy
augmentation
Jahn-Teller effect
crystal lattices
fine structure
substitutes
valence
magnetic permeability
atoms
electrons
x rays
temperature

All Science Journal Classification (ASJC) codes

  • General

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Enhancement of tetragonal anisotropy and stabilisation of the tetragonal phase by Bi/Mn-double-doping in BaTiO 3 ferroelectric ceramics. / Yabuta, Hisato; Tanaka, Hidenori; Furuta, Tatsuo; Watanabe, Takayuki; Kubota, Makoto; Matsuda, Takanori; Ifuku, Toshihiro; Yoneda, Yasuhiro.

In: Scientific reports, Vol. 7, 45842, 03.04.2017.

Research output: Contribution to journalArticle

Yabuta, Hisato ; Tanaka, Hidenori ; Furuta, Tatsuo ; Watanabe, Takayuki ; Kubota, Makoto ; Matsuda, Takanori ; Ifuku, Toshihiro ; Yoneda, Yasuhiro. / Enhancement of tetragonal anisotropy and stabilisation of the tetragonal phase by Bi/Mn-double-doping in BaTiO 3 ferroelectric ceramics. In: Scientific reports. 2017 ; Vol. 7.
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