Effects of Li Substitution on the Structure and Ferroelectricity of (Na,K)NbO 3

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Abstract
The structures of (1− x )(K 0.5 Na 0.5 )NbO 3 – x LiNbO 3 were investigated by the X‐ray Rietveld method at room temperature. It is surprising to find that the spontaneous polarization of orthorhombic phase reaches at the lowest value and the spontaneous polarization of tetragonal phase reaches at highest value at x =0.06. The lattice parameter of (K 0.47 Na 0.47 )NbO 3 –0.06LiNbO 3 , which was refined by using two phase model, reasonably described the structure change of the (1 x )(K 0.5 Na 0.5 )NbO 3 – x LiNbO 3 . The temperature dependence of Raman spectroscopy study of the phase transition of (K 0.47 Na 0.47 )NbO 3 –0.06LiNbO 3 showed that the increasing of temperature introduced a local disorder even above T c . The degree of cation ordering determines the electrical properties of the ceramics.

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