Expansion effects on the inversion of silica crystals in certain devitrified glasses

Arthur Q. Tool, James B. Saunders
1938 Journal of research of the National Bureau of Standards  
Expansion curves are presented which show the inversion effects of the cristobalite, tridymite, and quartz that were present in a de vitrified glass having a relatively high silica content. These results agree in practically every respect with results presented in a previous paper and obtained from the exothermic and endothermic effects caused by the same inversions. So far as these results are concerned with the nature and changes of inversion effects as tridymite is developed from
more » ... ed from cristobalite and quartz, they substantiate the previously suggested possibility that there are, at room temperature, two or more forms of tridymite instead of only one, such as has been generally supposed.
doi:10.6028/jres.021.041 fatcat:moxxleisijcttkubkveqbmx5ay