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Yokota, Hiroko; Uesu, Yoshiaki
Ferroelectrics, 10/20/2008, Letnik: 369, Številka: 1Journal Article
Optical second harmonic (SH) intensities and dielectric constants of Li doped KTaO 3 are measured under an external electric field. Applying the Landau-Devonshire phenomenological theory to the temperature dependence of SH intensities, we find that the order of ferroelectric phase transition changes from 2nd to 1st with the increase of Li concentration. The dielectric measurement reveals that a critical behaviour similar to Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 is observed. Additionally, we find that the critical electric field depends on the frequency of electric field and the effect becomes conspicuous in lower frequencies in Li doped KTaO 3 .
