Abstract
The process of synthesis of sodium β-alumina in a low-temperature nitric plasma is investigated. It is established that the main product of the plasmachemical reaction is sodium polyaluminate Na2O · nAl2O3 of an unknown structure, whose homogeneity range is within the interval of n = 3.5–8.0. The specifics of phase transformations in heating products of plasmachemical synthesis in the temperature interval of 600–1400°C are considered. The formation of the phase with the β-alumina structure (β-and β-Al2O3) proceeds in several stages with the formation of intermediate metastable sodium polyaluminates.
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