Abstract
THE short range order in glasses is now more or less generally accepted to have a dimension of 20 A or slightly more1,2. In the case of silica glass we have established3, on the strength of infrared absorption bands, that those regions (clusters, substructures) have the high-cristobalite structure, which is metastable at room temperature and normal pressure. It has been possible to relax a polymorphic transformation in pure silica glass into the stable low temperature form of cristobalite by heating a powdered sample at 483 K for 27 h (ref. 3). Heating relaxed the existing strains in the clusters by adjusting their structure to the low temperature conditions. A report by Wagstaff4 suggested another possible way of provoking the transition—by increasing the strains in the high-cristobalite clusters in silica glass by cooling it to liquid helium temperature.
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