Thermal Expansion and Phase Transitions in Na3H(SO4)2 Sulfate in the Low-Temperature Range.

Authors :: Dmitrieva, N. V.
Bubnova, R. S.
Filatov, S. K.
Shablinskii, A. P.
Krzhizhanovskaya, M. G.
Source :: Glass Physics & Chemistry; Sep2019, Vol. 45 Issue 5, p395-397, 3p
Publication Year :: 2019
Abstract: The thermal behavior of Na<subscript>3</subscript>H(SO<subscript>4</subscript>)<subscript>2</subscript> is studied in the temperature range –180...220°C in a pre-vacuum. At 180°C, the compound decomposed into a mixture of phases: Na<subscript>2</subscript>SO<subscript>4</subscript> (Cmcm), Na<subscript>2</subscript>SO<subscript>4</subscript> (P6<subscript>3</subscript>/mmc), Na<subscript>2</subscript>SO<subscript>4</subscript> (Fddd), and Na<subscript>2</subscript>S<subscript>2</subscript>O<subscript>7</subscript>. The maximal thermal expansion was observed near the α<subscript>33</subscript> axis. The anisotropy of thermal expansion sharply decreased together with the increase in temperature. [ABSTRACT FROM AUTHOR]

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