Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 94, Issue 12, Pages 4382-4386Publisher
WILEY
DOI: 10.1111/j.1551-2916.2011.04731.x
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Funding
- National Natural Science Foundation (NNSF) of China [51002173]
- Shanghai Rising-Star Program [09QH1402400]
- Chinese Academic of Science
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Energy-storage properties of 0.89Bi0.5Na0.5TiO3-0.06BaTiO3-0.05K0.5Na0.5NbO3 (0.89BNT-0.06BT-0.05KNN) lead-free ceramics were first investigated. Measurements of dielectric properties together with switching current curves indicate a rather diffuse ferroelectric (FE) to anti-ferroelectric (AFE) phase transition when heating from 20 degrees C to 90 degrees C. The energy density (W), which was calculated from P-E hysteresis loops, increases linearly with the external electric field when E exceeds AFE-FE transition field. W is independent of temperature and frequency, and maintains around 0.59 J/cm3 under 5.6 kV/mm in the stable AFE phase region. These properties indicate that 0.89BNT-0.06BT-0.05KNN ceramics might be a promising lead-free AFE material for energy-storage capacitor application.
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