Abstract
Abstract We present experimental results of dielectric and birefringence measurements on 3.5% and 8% Li:KTaO3 as a function of temperature. These results indicate that the 8% Li: KTaO3 sample undergoes a ferroelectric phase transition at 97K. The 3.5% sample seems to undergo a distortive transition at ∼75K. Preliminary measurements of the dependence of the dielectric constant on the electric field and temperature indicate that the distortive and ferroelectric domains are not identical. These results may explain the strange ferroelectric properties of this system. Raman experiments show that the splitting of the TO1 mode of the 8% Li sample extrapolates to zero at ∼97K supporting the conclusion that this sample undergoes a phase transition at this temperature. Raman spectra of both samples at temperatures above the phase transition or freezing temperatures exhibit in addition to second order Raman features first order Raman lines. These lines have the properties of fluctuation induced first order Raman sca...
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