Abstract
The cristobalite α-β inversion has been studied using DSC on cristobalites produced by firing high purity quartz with and without addition of a mineraliser. If no mineraliser was used, the inversion temperatures and hysteresis on heating and cooling increased with firing temperature. Firing time had little or no effect on inversion temperature. When a mineraliser was used, the same general trend was observed with increases in firing time at low temperatures leading to splitting of the inversion peak. The amount of mineraliser added had little effect. Tridymite inversions were also observed. The results are explained in terms of the degree of order of the cristobalite structure.
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We are grateful for the award of an S.E.R.C. CASE award in conjunction with Specialist Refractory Services to SJS. Helpful discussions have been held with Mr. D. W. Bailey and Dr. P. Watkins.
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Stevens, S.J., Hand, R.J. & Sharp, J.H. Temperature dependence of the cristobalite α-β inversion. Journal of Thermal Analysis 49, 1409–1415 (1997). https://doi.org/10.1007/BF01983699
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DOI: https://doi.org/10.1007/BF01983699