PRODUCTION METHOD OF FERROELECTRIC CRYSTAL HAVING BISMUTH LAYERED STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a production method of a bismuth layered structure ferroelectric crystal having a weak coercive electric field Ec and a large residual polarization Pr.

SOLUTION: The production method includes: a step of forming a crystal (A) of a layered structure ferroelectric material containing bismuth by using at least one bismuth-supplying material selected from bismuth and bismuth compounds; and a heat treatment step of heat treating the crystal (A) in an environment wherein an oxygen partial pressure is not lower than 1 atmospheric pressure. The purity of bismuth included in the bismuth-supplying material is ≥99.999 mol%.

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