Abstract
Using thermal analysis, we have constructed the phase diagram of the crystalline hydrate system Na2CO3 · 10H2O-Na2S2O3 · 5H2O, which has been shown to have eutectic phase relationships. The eutectic composition is 27 wt % Na2CO3 · 10H2O + 73 wt % Na2S2O3 · 5H2O, and the eutectic temperature is Te = −0.92°C. We have determined the enthalpy of fusion of the alloys in this system and evaluated the activities of their components both at the liquidus temperatures and in metastable regions. The composition dependences of the above thermodynamic characteristics are shown to correlate with each other and to have extreme values at the eutectic composition. The results obtained lead us to recommend the eutectic mixture of the crystalline hydrates in this system as a heat storage material.
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