The non-linear optical crystals CsTiOAsO4 (CTA) and RbTiOAsO4 (RTA) we
re grown from self-fluxes at high temperatures. High temperature X-ray
diffraction data were compared with data from thermometric analysis.
CTA undergoes a decomposition at 925 degrees C, a temperature substant
ially below the decomposition temperatures of RTA and KTP.