HIGH‐TEMPERATURE PREPARATION AND THE OPTICAL PROPERTIES OF SODIUM ALUMINATE*

Abstract
Crystalline sodium aluminate was prepared by heating monomolecular and other mixtures of Na2CO3 and A12O3.3H2O for varying periods to temperatures up to 1700°C.The constituents produced were identified by petrographic‐microscopic methods, and new optical data on sodium aluminate was obtained.Sodium aluminate was found to exist from temperatures below 1100 to above 1700°C, its melting point being above 1700°C.Small amounts of iron oxide aid the formation of sodium aluminate, especially at the lower temperatures.

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