Enthalpies of mixing for disordered alkali feldspars at high temperature: A test of regular solution thermodynamic models and a comparison of hydrofluoric acid and lead borate solution calorimetric techniques

Enthalpies of solution have been measured for an 11-member analbite-sanidine series at 704 degrees C in molten lead borate. Enthalpies of K-Na mixing determined from the data are statistically equivalent to those determined by HF solution calorimetry at 50 degrees C (Hovis, 1988). This indicates that regular solution thermodynamic models, which assume enthalpies of mixing to be independent of temperature, are valid for the disordered alkali feldspars. The experiments also demonstrate the consistency of the HF and lead borate solution calorimetric techniques. Volumes of K-Na mixing at room temperature also are reported.

Title	Enthalpies of mixing for disordered alkali feldspars at high temperature: A test of regular solution thermodynamic models and a comparison of hydrofluoric acid and lead borate solution calorimetric techniques
Creator	Navrotsky, A.
Creator	Hovis, Guy L.
Publisher	American Mineralogist
Academic Department	Geology & Environmental Geosciences
Division	Natural Sciences
Organization	Lafayette College
Date Issued	1995
Date Available	2013-02-06T20:45:33Z
Type	Article
Language	English
Bibliographic Citation	Hovis, G. L. and A. Navrotsky. (1995) "Enthalpies of mixing for disordered alkali feldspars at high temperature: A test of regular solution thermodynamic models and a comparison of hydrofluoric acid and lead borate solution calorimetric techniques." American Mineralogist 80 (3/4): 280-284.
Standard Identifier	Handle 10385/1090
Permalink	http://hdl.handle.net/10385/1090
Rights Statement	In Copyright
Rights Holders	Mineralogical Society of America