Abstract
Zeolites A mixed with various sodium polysulfides form ultramarine analogs of different colors upon thermal treatment. The resulting colors reflect the contribution of sulfur radical chromophores (mostly S 3 − and S 2 −) and can be modified by choosing the polysulfide of adequate S chain length and by the conditions of thermal treatment. In some products the original LTA structure is retained. In the other cases (particularly when alkalinity of the mixture is increased) the transformation towards SOD takes place. Some natural zeolites (e.g. chabazite) have been used as starting material for the synthesis of ultramarine analogs of the SOD structure.
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