Abstract
Structural, thermodynamic and phase properties in the Na 2S–H 2O system for application in a chemical heat pump have been investigated using XRD, TG/DTA and melting point and vapour pressure determinations. Apart from the known crystalline phases Na 2S·9H 2O, Na 2S·5H 2O and Na 2S a new phase Na 2S·2H 2O has been proven to exist. Na 2S· 1 2 H 2 O is not a phase but a 3:1 mixture of Na 2S and Na 2S·2H 2O, presumably stabilised by very slow dehydration kinetics. The vapour pressure–temperature equilibria of the sodium sulphide hydrates have been determined and a consistent set of thermodynamic functions for these compounds has been derived. XRD measurements indicate the topotactic character of the transitions between the hydration states.
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