Preparation and structural properties of nonlinear optical borates K2(1-x)Rb2xAl2B2O7, 0 < x < 0.75

The structures of K2(1-x)Rb2xAl2B2O7, x = 0.25, 0.5, 0.75, have been determined in space group P321 through Rietveld analysis of X-ray powder diffraction data. The solubility limit in K2(1-x)Rb2xAl2B2O7 crystals has been estimated as x similar to 0.83-0.9. Nonlinear optical properties of KRbAl2B2O7 have been verified by powder Kurtz-Perry method. Mechanisms of structural parameter variation in K2Al2B2O7 crystal family have been discussed. (C) 2011 Elsevier B. V. All rights reserved.