Origin of large electrostrain in Sn4+ doped Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ceramics

Zhen Liu, Ruihao Yuan, Dezhen Xue, Wenwu Cao, Turab Lookman

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Abstract

A relatively large bipolar strain of 0.23% was recently reported in 3% Sn4+ doped (BaTi0.8Zr0.2)O3-x (Ba0.7Ca0.3)TiO3 (BZT-xBCT) ceramics under a field of 20 kV/cm. This strain is 53% higher than that in BZT-50BCT (0.15% at 20 kV/cm). To systematically study the mechanism and origin of the large electrostrain enhancement in Sn4+ doped BZT-53.3BCT, we develop a parameterized Landau free energy model and perform phase field simulations. Our results indicate that the softening of the elastic modulus C=C11−C12 accompanied by the reduction of anisotropy energy due to the 3% Sn4+ doping is primarily responsible for the large electrostrain enhancement.

Original languageEnglish (US)
Pages (from-to)155-164
Number of pages10
JournalActa Materialia
Volume157
DOIs
StatePublished - Sep 15 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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