Health & Environmental Research Online (HERO)


Print Feedback Export to File
6878332 
Journal Article 
THERMODYNAMIC PROPERTIES OF WOLLASTONITE, PSEUDOWOLLASTONITE AND CASIO3 GLASS AND LIQUID 
Richet, P; Robie, RA; Hemingway, BS; , 
1991 
Yes 
European Journal of Mineralogy
ISSN: 0935-1221 
E SCHWEIZERBART'SCHE VERLAGS 
STUTTGART 
475-484 
Available thermodynamic data for wollastonite, pseudowollastonite and CaSiO3 glass and liquid have been reviewed and complemented to obtain a consistent set of thermodynamic properties : heat capacities, entropies, and temperatures and enthalpies of transition and fusion. Drop-calorimetry experiments for wollastonite between 800 and 1350 K show a first-order phase transition at 995 K with a small enthalpy of transition of 200 J/mol. From low-temperature C(p) measurements between 10 and 370 K for CaSiO3 glass, the absolute and configurational entropies of the amorphous phases have been determined. The differences between the properties of wollastonite and pseudowollastonite are greater than suggested by current polyhedral modeling of the heat capacity.