Shape-controlled crystal growth of Sr₃NbGa₃Si₂O₁₄ and Sr₃TaGa₃Si₂O₁₄ piezoelectric crystals by the micro-pulling-down method

摘要

We grew column-shaped Sr₃NbGa₃Si₂O₁₄ (SNGS) and Sr₃TaGa₃Si₂O₁₄ (STGS) langasite-type piezoelectric single crystals by the micro-pulling-down (;C;-PD) method. 3-mm-diameter SNGS and STGS crystals were grown using a Pt-Rh crucible with a 3-mm-diameter columnar die. According to X-ray rocking curve measurements, the grown crystals had crystallinity equivalent to that of crystals grown by the Czochralski (Cz) method. The crystals were single-phase materials with langasite-type crystal structure. The lattice parameters of the grown crystals were almost consistent with those of crystals grown by the Cz method.