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 ∼ 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.

Figure optionsDownload as PowerPoint slideHighlights
► Solid solutions K2(1−x)Rb2xAl2B2O7 are synthesized over wide composition range up to x ∼ 0.83.
► Crystal structure of K2(1−x)Rb2xAl2B2O7 solutions is determined in space group P321.
► Second harmonic generation is observed in KRbAl2B2O7.
► Drastic variation of cell parameters is found over KABO-type crystal family.