Glasses in the system K2O-TiO2-P2O5 close to KTiOPO4 composition. Part 2: Crystallization behaviour

作者：Kriltz Antje^*; Erdsack Joerg; Hotzel Mario; Voelksch Guenther

来源：Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B, 2010, 51(3): 150-158.

The crystallization of K2O-TiO2-P2O5 glasses derived from the KTP composition was studied using DTA, XRD, FTIR and TEM methods. An annealing process of the amorphous glasses in the temperature range between 600 degrees C and 700 degrees C proved to be suited for the precipitation of nanoscale KTiOPO4 crystals. Dependent on the conditions of the heat treatment, KTP crystals are accompanied by a the cubic, low temperature or trigonal, high temperature modification of KTi2(PO4)(3) and by K3Ti3(PO4)(5) crystals. Introducing 2 mol% of Sb2O5 into the batches to reduce the Ti3+-content of the samples, an accelerated crystal growth and the precipitation of a greater crystal amount is observable. Dopants of Sb2O5 also cause an enhanced surface crystallization, whereas the surface layer mainly consists from K3Ti3(PO4)(5) crystals. The determination of n(2) values by DFWM measurements shows, that even weak phase formation processes below the XRD detection limit result in an increased Kerr-type nonlinearity of the glasses.

• 出版日期2010-6