Abstract
Growth of Ca 3 NbGa 3 Si 2 O 14 (CNGS) has been attempted by the conventional RF-heating Czochralski technique with a platinum crucible (50 mm in diameter and height). Obtained crystals were generally prismatic with clearly defined face of (001). Transparent and colorless single crystals of CNGS up to about 30 mm in diameter and 50 mm in length were successfully grown from the melt of 1325C under the optimum growth conditions of the pulling axis of y, a crystal pulling rate of 1.0 mm/h and rotation rate of 10 rpm. The dielectric constant l 11 T and l 33 T were 17.6 and 46.7, respectively. Elastic compliances s 11 E and s 44 E were 8.84 and 11.17 2 10 m 12 m 2 N m 1, respectively. The coupling coefficient k 12 of 10% was somewhat smaller than that of La 3 Ga 5 SiO 14 (LGS) due to the crystal quality.
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