Phase Formation in the ΒaΒ2O4– NaBaBO3–BaMoO4 System

Abstract

Triple system BaB₂O₄–NaBaBO₃–BaMoO₄ is studied to optimize the growth of barium metaborate crystals (β-BaB₂O₄) - promising materials for nonlinear optics in visible and ultraviolet ranges. Main attention is paid to the phase equilibria and characteristics of crystallization in this system. It is shown that the addition of barium molybdate decreases the solution-melt viscosity, increasing the crystal yield and quality. The key parameters and β-BaB₂O₄ primary crystallization regions are determined by solid-phase synthesis, differential scanning calorimetry, and powder X-ray diffraction techniques. Experiments are performed on growing spontaneous β-BBO crystals. The results obtained demonstrate the promising application of compositions of this system as solvents for β-BBO crystal growth.