PRODUCTION OF BARIUM BORATE SINGLE CRYSTAL HAVING LOW TEMPERATURE PHASE

摘要

PURPOSE:To readily obtain a barium borate single crystal consisting of pure low temperature phase structure, by blending BaCl2 and NaBO2 with NaCl which is a flux at a specific molar ratio and heating and melting the blend to carry out reaction and depositing the resultant BaB2O4 as a crystal in the flux. CONSTITUTION:1-13.5mol. sodium chloride as a flux is blended with a raw material consisting of 1mol. barium chloride and 2mol. sodium metaborate. Then the blend is heated and melted to carry out reaction and barium borate which is reaction product is deposited as a crystal in the flux. Thus a single crystal of beta-BaB2O4, consisting of prism- or needle-like transparent crystal, containing no high temperature phase and wholly consisting of pure low temperature phase structure is obtained. The single crystal has large nonlinear optical effect and is strong to injure by laser and useful as nonlinear optical material.