Solution calorimetric investigation of fluor-chlorapatite crystalline solutions

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Solution calorimetric investigation of fluor-chlorapatite crystalline solutions

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dc.contributor.author Hovis, Guy L.
dc.contributor.author Harlov, D. E.
dc.date.accessioned 2012-01-13T18:59:08Z
dc.date.available 2012-01-13T18:59:08Z
dc.date.issued 2010
dc.identifier.citation Hovis, G. L. and D. E. Harlov. (2010) "Solution calorimetric investigation of fluor-chlorapatite crystalline solutions." American Mineralogist 95 (7): 946-952. en_US
dc.identifier.uri http://hdl.handle.net/10385/884
dc.description.abstract Solution calorimetric measurements have been made on 17 synthetic fluorapatite-chlorapatite crystalline solutions at 50 degrees C in 20.0 wt% HCl under isoperibolic conditions. Analysis of the calorimetric data indicates that heats of mixing across the series may reach values as high as 8.3 kJ/mol. Normally such a high degree of thermodynamic nonideality would be associated with immiscibility, yet no such miscibility gap is indicated by either synthetic or natural fluor-chlorapatite specimens. Based on full chemical analyses, all Cl-rich samples (X(Cl) > 0.65) of this study have halogen deficiencies that imply the presence of 4-11 mol% vacancies in the anion sites, which are interpreted to be associated with oxyapatite substitution. Separate analysis of data for the vacancy-free samples produces a linear fit for enthalpy of solution vs. composition, which yields an alternative interpretation of thermodynamic ideality. Together these models define the limits of enthalpy behavior for the fluor-chlorapatite system. en_US
dc.publisher American Mineralogist en_US
dc.subject enthalpies of mixing en_US
dc.subject fluorapatite en_US
dc.subject chlorapatite en_US
dc.subject thermodynamics en_US
dc.title Solution calorimetric investigation of fluor-chlorapatite crystalline solutions en_US
dc.type Article en_US
dc.identifier.doi 10.2138/am.2010.3485

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