Abstract
Raman spectra of LiTaO3 crystals with different proton-exchange times are examined. The oblique phonon at 190 cm−1 and A1(TO) phonons at 356 and 596 cm−1 appear in the transverse A1- and E-symmetry spectra, respectively. Their intensities change with proton-exchange time and reach a maximum in the spectrum of the sample with about 8 h treatment. In the E-symmetry spectra, the intensities of E(TO) modes also show a dependence on proton-exchange time and reach a maximum in the spectrum of the sample with 12 h treatment. These results are attributed to both the internal strain resulting from the order–disorder distribution of protons inside the sample and the enhanced photorefractive effect. In addition, the existence of energy transfer between A1(TO) and E(TO) modes is ascribed to the coexistence of paraelectric and ferroelectric phases in the protonated samples.
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