Effects of NaSbO3 on phase structure and electrical properties of K0.5Na0.5NbO3–LiTaO3–NaSbO3 piezoelectric ceramics

  • Haiwei Du
  • Yanqiu Huang
  • Huilin Li
  • Hongping Tang
  • Wei Feng
Article
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Abstract

The (0.96–x)K0.5Na0.5NbO3–0.04LiTaO3–xNaSbO3 (abbreviated as KNN–LT–xNS, x = 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08) lead-free piezoelectric ceramics were fabricated by conventional ceramic technique. The crystal structure, dielectric, ferroelectric and piezoelectric properties of the ceramics were investigated. The Curie temperature (T C) and the polymorphic phase transition temperature (T O−T) of the ceramics decreased gradually with the increase of NaSbO3. In addition, a coexistence of orthorhombic and tetragonal phases in the ceramics was identified in the composition range of 0.05 ≤ x ≤ 0.08. The ceramic with a composition of x = 0.06, which was close to the orthorhombic side of the polymorphic phase transition (PPT) region, exhibited excellent electrical properties with piezoelectric coefficient d 33 = 233 pC/N, planar electromechanical coupling coefficient k p = 0.328, remnant polarization P r = 14.7 μC/cm2, coercive field E c  = 11.7 kV/cm, relative permittivity \( \varepsilon_{33}^{\text{T}} /\varepsilon_{0} \) = 1,033, and loss tangent tan δ = 0.063. The ceramics had relatively low Q m value in the range of 10–37.

Keywords

BiFeO3 Piezoelectric Property Spontaneous Polarization LiTaO3 Electromechanical Coupling Factor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

This work was supported by the Open Foundation of Teaching Laboratory of China University of Geosciences, China (No. CUGSKJ2011117). The authors are grateful to Prof. Xinrong Lei for XRD analysis and Dr. Fei Li for assistance in performing the electrical property measurements.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Haiwei Du
    • 1
    • 2
  • Yanqiu Huang
    • 1
    • 2
  • Huilin Li
    • 1
    • 2
  • Hongping Tang
    • 1
    • 2
  • Wei Feng
    • 1
    • 2
  1. 1.Faculty of Materials Science and ChemistryChina University of GeosciencesWuhanPeople’s Republic of China
  2. 2.Engineering Research Center of Nano-Geomaterials of Ministry of EducationChina University of GeosciencesWuhanPeople’s Republic of China

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