Temperature dependent, large electromechanical strain in Nd-doped BiFeO3-BaTiO3 lead-free ceramics

By Dawei Wang, Amir Khesro, S. Murakami, A. Feteira, Quanliang Zhao, I. Reaney. 2017

204 citations recorded by the source corpus.

Lead-free piezoceramics with the composition 0.7(Bi1-xNdx)FeO3-0.3BaTiO3+0.1 wt% MnO2 (BNxF-BT) were prepared using a conventional solid state route. X-ray diffraction and temperature dependent permittivity measurements indicated a transition from a composition lying at a morphotropic phase boundary (MPB) to a pseudocubic phase as a function of Nd concentration. The highest maximum strain (Smax ∼ 0.2% at 60 kV/cm) and effective piezoelectric coefficient (d33* = 333 pm/V) were obtained at room temperature for the composition BN0.02F-BT. The decrease in remanent polarization (Pr) and Berlincourt d33 with increase in Nd concentration can be attributed to the coexistence of ferroelectric and relaxor phases. In-situ polarisation and strain measurements revealed an increase in Pr and d33* with temperature and a reduction in the coercive field EC. Presumably this behavior is due to a combination of thermally activated domain wall motion and lowering of the activation energy for a field induced relaxor-ferroelectric transition, as the Curie maximum is approached.

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/9b64720bcfb7142c60dec5d8c54c8f32fcf05bea

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In Electronic, Optical and Magnetic Materials

  1. A. Feteira
  2. Dawei Wang
  3. I. Reaney
  4. Di Zhou
  5. X. Tan

In Materials Chemistry

  1. Dawei Wang
  2. I. Reaney
  3. Di Zhou
  4. A. Feteira
  5. X. Tan
  6. Ge Wang

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