Effect of Cooling Rate on Glass Formation for Some Oxynitride Glasses
Rapid cooling rates and quenching have traditionally been associated with glass formation. Hampshire et al.  investigated oxynitride glasses cooled in a tungsten resistance furnace at approximately 200oC/min and found that fast cooling rates were only important near the limits of the glass-forming region. In the current work on various M-Si-Al-O-N (M=Y, La, Yb, Nd) systems, it was found that even at a relatively slow cooling rate glass formation was still possible for a wide range of compositions. Different cooling rates were investigated to determine the minimum cooling rate at which a glass will form. Quantitative X-ray analysis of melted compositions indicated the relative amounts of amorphous phase and crystalline phase.
W. Redington et al., "Effect of Cooling Rate on Glass Formation for Some Oxynitride Glasses ", Materials Science Forum, Vol. 554, pp. 25-30, 2007