Raman Spectra Study of K0.5Na0.5NbO3 Ferroelectric Thin Films

초록

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 %) for KNN thin film. The KNN film with 20 mol% excess K and Na was an optimized KNN perovskite phase. From the Raman spectra, a change in the scattering mode was observed due to the chemical composition fluctuations of the excess K and Na. The peak of the (v(1) + v(5)) internal vibrational mode in the NbO6 octahedra was split into two vibration modes which were shifted toward lower or higher wavenumbers depending on the K and Na cation deficiencies or redundancies. (C) 2010 The Japan Society of Applied Physics

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