Thermodynamic
exploitation of the liquidus curves in the MIPO3–Pb(PO3)2, MIPO3–Cu(PO3)2
and MIPO3–Ce(PO3)3
systems (M
I=Li,
Na, K, Rb, Cs, Ag, Tl) |
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Authors: | C Marhag D Ben Hassen-Chehimi H Said |
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Institution: | 1. Faculté des
Sciences de Bizerte, Laboratoire de Thermodynamique, Zaezouna-Bizerte, Tunisia, 7021 2. Faculté
des Sciences de Bizerte, Laboratoire de Physico-Chimie
Minérale, Zarzouna-Bizerte, Tunisia, 7021
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Abstract: | The thermodynamic
exploitation of the solid–liquid equilibria in the MIPO3–Pb(PO3)2, MIPO3–Cu(PO3)2
and MIPO3–Ce(PO3)3
systems (with M
I=Li,
Na, K, Rb, Cs, Ag, Tl) is carried out using a semi-empirical equation of the
liquidus curves already used with success for similar binary systems.
The enthalpy of fusion is calculated for each pure polyphosphate on
the assumption that the liquid solution is ideal and only formed by MIPO3
and M(PO3)q entities (q=2 for Pb and Cu, q=3
for M=Ce). In the most binary systems,
a wide difference between the calculated values of the melting enthalpies
of these polyphosphates and the measured ones determined from the DTA curves,
was observed. This difference is probably due to the existence of some molecular
associations in the liquid phase. |
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Keywords: | |
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