Nonlinear-optical phases in strontium tetraborate-lead tetraborat system

Abstract

The phase diagram of strontium tetraborate SrB₄O₇ — lead tetraborat PbB₄O₇ system was specified by means of improved DTA technique. Concentration dependence of phases formation, trigonal p or orthorhombic a, by low-temperature crystallization of the glasses (1-x)SrB₄O₇-xPbB₄O₇ (0≤x≤1) was studied. Only the metastable trigonal phase β-Sr₁₋xPbxB₄O₇ for concentration x<0.2 is crystallized. The both high nonlinear phases of strontium-lead tetraborates (deff (β-Sr₀.₈Pb₀.₂B₄O₇) ~~ deff (PbB₄O₇)) are perspective for use as the non-linear-optical crystals components of glass-ceramic materials on the basis of strontium tetraborate-lead tetraborate system.