Crystallization behavior and glass formation of selected lunar compositions.The kinetics of crystal growth have been determined over a wide range of temperature, from 800 to 1219 C, for lunar compositions 14259 and 14310. At all temperatures for both compositions the extent of crystal growth is found to be a linear function of time. For both materials, the growth rate versus temperature relations exhibit the form generally found with glass-forming materials. At all temperatures measured, the crystal growth rate of composition 14259 is smaller than that of composition 14310. The maximum growth rate for both compositions occurs at a temperature of about 1120 C. The growth rate data are combined with viscosity data obtained on the same compositions to construct the reduced growth rate versus undercooling relations.
Document ID
19730035056
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Scherer, G.
Hopper, R. W.
Uhlmann, D. R. (MIT Cambridge, Mass., United States)