The effect of K and Na excess on the ferroelectric and piezoelectric properties of K0.5Na0.5NbO3 thin films

We have fabricated K0.5Na0.5NbO3 (KNN) thin films on Pt substrates by a chemical solution deposition method and investigated the effect of K and Na excess (0-30 mol%) on ferroelectric and piezoelectric properties of KNN thin film. It was found that with increasing K and Na excess in a precursor solu...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2009-11, Vol.42 (21), p.215304-215304 (5)
Main Authors: Ahn, C W, Lee, S Y, Lee, H J, Ullah, A, Bae, J S, Jeong, E D, Choi, J S, Park, B H, Kim, I W
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric thin films
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Domain structure
hysteresis
Exact sciences and technology
Ferroelectricity and antiferroelectricity
Physics
Piezoelectricity and electromechanical effects
Switching phenomena
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Summary:We have fabricated K0.5Na0.5NbO3 (KNN) thin films on Pt substrates by a chemical solution deposition method and investigated the effect of K and Na excess (0-30 mol%) on ferroelectric and piezoelectric properties of KNN thin film. It was found that with increasing K and Na excess in a precursor solution from 0 to 30 mol%, the leakage current and ferroelectric properties were strongly affected. KNN thin film synthesized by using 20 mol% K and Na excess precursor solution exhibited a low leakage current density and well saturated ferroelectric P-E hysteresis loops. Moreover, the optimized KNN thin film had good fatigue resistance and a piezoelectric constant of 40 pm V-1, which is comparable to that of polycrystalline PZT thin films.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/42/21/215304