Abstract
The colored products analogous to ultramarine have been obtained by thermal treatment (500–800 °C) of cancrinite mixed with elemental sulfur and alkalis. The samples obtained at 500 °C maintain the original structure of cancrinite, while heating of the mixture at 800 °C resulted in zeolite structure transformation towards SOD in the case of mixture containing Na + cations and to kaliophilite or unknown structures, when K + or Li + were applied as alkali sources. Encapsulation of sulfur species inside the cancrinite cages does not result in the generation of another radicals but S 3 - or S 2 - , which is reflected in the ESR spectra resembling those embedded in sodalite cages.
Published Version
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