METHOD FOR PRODUCING SINGLE CRYSTAL AND PIEZOELECTRIC ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a single crystal expressed by the composition formula, M3NbGa3Si2O14 (M is an alkali earth metal) and having a sufficient quality necessary for a piezoelectric material. SOLUTION: This method for producing the single crystal comprises bringing a crystal orientation plane inclined at an angle of 50.8-90 degrees from [001] axis of a seed crystal into contact with a melted liquid in a crucible, and pulling up to grow the single crystal expressed by the composition formula, M3NbGa3Si2 O14 (M is an alkali earth metal) at the lower end of the seed crystal. The obtained single crystal can suitably be used for the components of various piezoelectric elements such as a resonator and a filter.