Journal
THIN SOLID FILMS
Volume 520, Issue 7, Pages 2800-2804Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2011.12.030
Keywords
Dielectric tunability; Barium zirconate titanate; Barium calcium titanate; Thin film; Sol-gel; Optical properties; X-ray diffraction; Ferroelectric properties
Categories
Funding
- NSFC [50872156, 51172289]
- China Postdoctoral Science Foundation [20110490970]
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We report high dielectric tunabilities of (1-x)Ba(Zr0.2Ti0.8)O-3-x(Ba0.7Ca0.3)TiO3 (BZT-xBCT) (x=0.15, 030, 0.40, 0.45, 0.50, and 0.55) thin films prepared by a sol-gel method. The films show a pure perovskite structure with random orientation. They have moderate dielectric constant ranging from 350 to 500 and low dielectric loss near 3.0% at 1 kHz with 0 V bias at room temperature. The dielectric tunability of the BZT-0.55BCT thin films is up to 65% at 400 kV/cm and 100 kHz. The films exhibit a high optical transmission in the range of 420 nm-1500 nm. Their optical band gap energies are about 3.90 eV. (C) 2011 Elsevier B.V. All rights reserved.
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