Abstract
Al substituted Langasrte crvstals,La_3(Ga_<5-X> Al_X)Si0_<14>were synthesized by solid phase reaction, μ-pulling down and Czochralski techniques. From the result of solid phase reaction,χ=2.0 was found to be limit of substitution. In χ=0.5 crystal which was grown by Czochralski method, electromechanical coupling coefficients, k_<26>and k_t compared favorably with that of La_3Ga_5Si0<14>
