Beregi E, Watterich A, Madarasz J, Toth M,  Polgar K. (2002): X-ray diffraction and FTIR spectroscopy of heat treated R2O3 : 3Ga(2)O(3): 4B(2)O(3) systems - J CRYST GROWTH 237: 874-878 Part 1 APR
Abstract:
In the R2O3:3Ga(2)O(3):4B(2)O(3), systems (R-La, Nd, Sm, Gd, Ho, Y, Er and Yb), X-ray diffraction and infrared absorption spectroscopy were used to study the solid-state reactions in the 575-1050degreesC temperature range. In some samples (R = Sm, Gd, Ho, Er and Y) huntite (RGa3(BO3)(4)) phases accompanied by RBO3 and GaBO3 intermediate phases were identified. However in the systems of  2O3:3Ga(2)O(3):4B(2)O(3) for R = La3+, Nd3+ and Yb-3divided by. instead of the expected huntite phases, La-, Nd-metaborate or  YbGa(BO3)(2) dolomite type phases were formed. Detailed XRD of the rare-earth gallium borates are presented for the first time. Based on the above results. some chemical reactions were assumed for the processes. (C) 2002 Elsevier Science B.V. All rights reserved.
Author Keywords:
X-ray diffraction, borates, rare-earth compounds, non-linear optic materials