Abstract
The temperature dependence of the electrostrictive coefficients (Q11 and Q12) of K0.95Li0.05Ta0.73Nb0.27O3 single crystals, which were applied to electro-optical devices, was measured to calculate precisely the refractive index modulation. To measure the electrostrictive coefficients accurately, we prevented electron injection by employing Pt electrodes. We also determined the electric field range applied to the sample by measuring P-E curves to avoid the field induced phase transition. The experimental results showed that both Q11 and Q12 were temperature independent and had values of approximately 0.070 and −0.026 m4/C2, respectively. These results differed from a previous study of KTa0.55Nb0.45O3, which revealed an anomalous temperature dependence. The reason for the different results is discussed.
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