Skip to Main Content


The phase transformations of homoionic montmorillonites and the compositions of high-temperature products have been studied by X-ray powder diffraction and electron microscopy. Quartz-type phases crystallized as high-quartz-like phases that were metastable because of their conversion into other compounds, such as cristobalite, spinel, and cordierite, on prolonged heating. Using the analytical electron microscope, the composition of high-quartz-type phases was found not to be pure Si02, but instead showed a structural formula close to MgAl2Si5014. Cristobalite-type phases were also noted and contained Mg and Al, although the amount was less than in the high-quartz-type phases. The mode of formation and decomposition of high-temperature products was affected by bulk chemical compositions, especially the Mg/Al ratio of the original montmorillonites.

You do not currently have access to this chapter.

Figures & Tables





Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal