Raman spectra of ordinary and extraordinary phonons in LiNbO3 and LiTaO3 are recorded under a set of angles between wave vector and optic axis with the same backward scattering geometry, which makes all of the extraordinary phonons to appear in one directional‐dispersion spectra series, and the directional dispersion is reliably determined. The symmetry and the number of polar phonons in both the crystals are found to be the same, 4A1T + 4A1L + 9ET + 9EL. The directional dispersion of extraordinary phonons has thirteen branches with similar coupling in LiNbO3 and LiTaO3.
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Yang et al. (1987) studied this question.
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