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Co-Doping Effect of BiGaO 3 and (Bi,Na,K,Li)ZrO 3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO 3 Lead-Free Ceramics

Author

Listed:
  • Min-Ku Lee

    (Nuclear Materials Development Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea)

  • Sang-Don Bu

    (Department of Physics and Research Institute of Physics and Chemistry, Chonbuk National University, Jeonju 54896, Korea)

  • Gyoung-Ja Lee

    (Nuclear Materials Development Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea)

Abstract

The phase boundary structure of (K,Na)NbO 3 piezoelectric ceramic was modified by doping with Bi(Na,K,Li)ZrO 3 and BiGaO 3 through normal solid-state sintering. Rietveld refinements by X-ray diffraction revealed that the Bi(Na,K,Li)ZrO 3 /BiGaO 3 co-doping in (K,Na)NbO 3 led to a multi-phase structure at room-temperature, effectively moving the rhombohedral-orthorhombic (R-O) and orthorhombic-tetragonal (O-T) polymorphic phase transition temperatures close to the room temperature region. Increased levels of doping also generated a structural transition, i.e., triphasic R-O-T to diphasic R-T (T-rich) and finally to R-T (R-rich), contributing to shrinkage of the O phase as well as the increase of R phase fraction. A sensitive influence of the BiGaO 3 doping (0.001 mole fraction level) on the structural properties such as the phase and microstructure was shown, resulting from the effect of the super-tetragonal structure of BiGaO 3 . The d 33 property was strongly dependent on the phase and its volume fraction, in addition to the grain sizes. Eventually, enhanced and balanced properties of the piezoelectric coefficient and Curie temperature ( d 33 = 309 pC/N, T C = 343 °C) were obtained when the doped ceramic had a T-rich (86%) R-T structure.

Suggested Citation

  • Min-Ku Lee & Sang-Don Bu & Gyoung-Ja Lee, 2019. "Co-Doping Effect of BiGaO 3 and (Bi,Na,K,Li)ZrO 3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO 3 Lead-Free Ceramics," Energies, MDPI, vol. 12(5), pages 1-10, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:5:p:886-:d:211817
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