What could cause specific heat capacity of a salt mixture (m.p 500 oC) to change by roughly 25 % between 600 and 700 oC. Also, it seems that slight variations in mole % of components affect it.
Thanks
melting point of salt is around of 800C, you are looking the transition to liquid.
best regards
Dear Günther W. H. Höhne and Enrique Cardenas-Sanchez thank you a lot for your replies.
The sample weight was taken before and after the measurements and it stayed within the measurement uncertainties. Measurements were done in sealed golden pans and loading was done inside a glovebox. DSC was used to do the measurements. This behaviour (when heat capacity was increasing with the temperature was observed for 6 samples and 4 of them had steep slopes (ca. 25 % increase).
The melting point is around 500 oC
You may want to check the following discussion for its possible interest concerning to your query: https://www.researchgate.net/post/Where_can_I_find_a_reliable_phase_diagram_of_NaNO3_KNO3
Hi Carlos,
thank you for your reply. Maybe I was not clear enough in my question, however, I was asking why there is constant decrease in heat capacity values, when they are expected to be constant. So, I was not asking about phase diagrams and phase transitions.
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