Other
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3665t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 17, pp.3665-3673
Other
1
Scientific paper
Transposed-temperature-drop calorimetry performed in a Setaram HT 1500 calorimeter was used to study directly the melting of mixtures of crystalline diopside (CaMgSi 2 O 6 , anorthite (CaAl 2 Si 2 O 8 ), and pseudowollastonite (Wo, CaSiO 3 ) at 1773 K. Thermochemical cycles used completely avoid the glassy state by transforming crystals directly to melts. The results, zero or slightly negative enthalpies of mixing in Di-An-Wo melts at 1773 K, indicate that very small heat effects accompany any changes in melt structure upon mixing. Athermal mixing is prevalent in the diopside-rich region and along the Di-An join, whereas mixing is slightly exothermic in the rest of the Di-An-Wo system, especially in the Wo-rich region. Our data are consistent with an enthalpy of fusion of pseudowollastonite of 57 ± 5 kJ/mol at the melting point, 1827 K.
Gan Hao
Navrotsky Alexandra
Tarina Igor
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