Structure and vibration spectrum of laser crystal Yb:KGd(WO4)2

The selection of the flux and the design of the proper processes are the key factor for the growth of Yb:KGd(WO4)(2) laser crystal. Yb:KGd(WO4)(2) crystal was grown by the Top Seeded Solvent Growth (TSSG) method using K2W2O7 as a suitable flux. On the base of TG-DTA, the crystal has two obvious absorption peaks at 1086 degrees C and 1021 degrees C, its melting point is 1086 degrees C, phase transition temperature from tetragonal to monoclinic is 1021 degrees C. The Yb:KGd(WO4)(2) crystal consists Of WO6 octahedra which consists of WOOW double. oxygen bridges and WOW single bridges. IR and Raman spectra show the atom group WO42- flex vibration at 436 cm(-1) and atom WO42- group bend vibration at 740 similar to 925cm(-1), WOOW double oxygen bridge vibration at 903, 765, 684, 438, 498 and 297cm(-1), WOW single bridges vibration at 808, 526 and 232cm(-1). Analyzing on the X-ray diffraction spectrum of Yb:KGd(WO4)(2) crystal powder sample, we can conclude that the beta-Yb:KGd(WO4)(2) crystal is of a monoclinic system, and C2/c space group.