Re: Vapor Pressure


Posted by Uncle Al on May 24, 2004 at 14:20
(68.99.179.162)

Re: Vapor Pressure (Megan)

Absent interaction and given mutal solubility, the total vapor pressure is the sum of the pure components' vapor pressures at temperature, each times its mole fraction in solution times its chemical activity. This is by the book. In principle you can reasonably calculate it given some measured constants.

If there is interaction (compound and multiple compound formation; acid-base or redox interaction), things go from bad to worse - especially with interaction dissociation vs. temp. The way to do it real world is to measure, then rationalize with a model (phase diagram).

MnAl is known for its icosahedral crystal stoichiometries, e.g., Al_86Mn_14 or MnAl_6.

Phys. Rev. Lett. 57 1611 (1986)
Phys. Rev. B 32 1940 (1985)
J. Solid State Chem. 124 65 (1996)

and others (including magnetic interactions)

Proc. Natl. Acad. Sci. USA 84(11) 3537 (1987)
http://arxiv.org/abs/cond-mat/9512013

What a mess!

--
Uncle Al
http://www.mazepath.com/uncleal/qz.pdf
http://www.mazepath.com/uncleal/eotvos.htm
(Do something naughty to physics)



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