Czochralski growth and characterization of the piezoelectric single crystal La3Ga5.5Nb0.5O14

La3Ga5.5Nb0.5O14 crystals are promising materials for bulk acoustic wave and surface acoustic wave applications. In this work, the starting materials for high quality La3Ga5.5Nb0.5O14 single crystal growth were investigated. Adding extra Ga2O3 of 1.0–1.5 wt% to the starting materials was found to be beneficial for high quality crystal growth. High quality La3Ga5.5Nb0.5O14 crystals were grown by the conventional Czochralski method along the XX- and ZZ-axes. Complete sets of dielectric constants, piezoelectric coefficients and elastic constants of La3Ga5.5Nb0.5O14 crystals grown along the XX- and ZZ-axes were determined by a resonance technique and impedance analysis at room temperature, respectively. The relevant constants were obtained and discussed. The obtained results for La3Ga5.5Nb0.5O14 are: ε11T=19.07, ε33T=79.06, d11=−7.00pC/N, d14=5.60pC/N; s11E=9.60 pm2/N; s12E=−4.65 pm2/N; s13E=−2.05 pm2/N; s14E=−3.60 pm2/N; s33E=5.77 pm2/N; s44E=23.60 pm2/N and s66E=28.50 pm2/N, respectively.