Development of Crystal Growth Technology of Shaped Langasite-type Piezoelectric Crystals by Micro-Pulling-Down Method

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Shape-controlled langasite-type piezoelectric single crystals were grown by micro-pulling-down method and the physical properties of grown crystals were investigated. Columnar, plate and tube-shaped crystals with a-axis and c-axis in growth direction were grown and the diameters of grown columnar-shaped crystals were controlled approximately 3 mm from initial to later part. The grown crystals without cracks indicated relatively high crystallinities and a single phase of langasite-type structure in the powder XRD patterns. The piezoelectric constant d11 of CNGS crystal indicated 3.98 pC/N which was well accorded with the previous report.