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The authors derive that the variation in the phase matching temperature for second harmonic generation (SHG) along the pull direction of lithium niobate (LiNbO3) crystal is proportional to the fraction solidified, and propose that the distribution coefficients of Li2O into LiNbO3 could be determined by measuring these relationships for crystals grown from the melts of various compositions without analyzing the composition of a crystal. It is found that the distribution coefficients estimated by this technique are in good agreement with the equilibrium distribution coefficients given in the equilibrium phase diagram by Lerner et al.
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Tsuya et al. (1971) studied this question.
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