T-X phase diagram of Na2S2O7-NaHSO 4

Abstract

In this study we obtain a T-X phase diagram of Na<inf>2</inf>S <inf>2</inf>O<inf>7</inf>-NaHSO<inf>4</inf> using the mean field theory. We fit our calculated phase line equation to the experimental T-X phase diagram. By choosing appropriately the coefficients in the free energy expansions, our calculated phase diagram agrees well with the experimentally observed phase diagram of Na<inf>2</inf>S<inf>2</inf>O<inf>7</inf>-NaHSO<inf>4</inf>. © 2005 The Physical Society of the Republic of China. © 2021 Elsevier B.V., All rights reserved.