I am looking for the heat of the fusion of manganese dioxide. I am unable to find it in the literature.
Hi, I think it is impossible to measure the latent heat of MnO2. with temperature increasing, MnO2 will be transferred to Mn2O3, then to Mn3O4, and finally to MnO before melting. So, you can calculate the latent heat of MnO instead of MnO2.
MnO melting enthalpy, based on FactSage calc. = 767.66 [J] (at 1842C)
Jianmeng Jiao Thanks for the reply.
The decomposition of MnO2(s) indeed occurred below the melting point. However, the condition (pressure-temperature-medium) of measuring the melting point and the degradation may differ [1]. I am confused about this as well.
As I found the melting point (535 degrees C) [2] and Cp (till 527 degrees C) [3] values, I am assuming the latent heat of fusion can be measurable.
[1] Article Thermodynamic Property of Manganese Oxides
[2] https://beta-static.fishersci.com/content/dam/fishersci/en_US/documents/programs/education/regulatory-documents/sds/chemicals/chemicals-m/S25420.pdf
[3] http://eprints.iisc.ac.in/43875/2/Thermodynamic_Mn2O3_MnO2.pdf
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