Other
Scientific paper
Jun 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969gecoa..33..671t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 33, Issue 6, pp.671-690
Other
14
Scientific paper
The crystalline solutions in the system NaCl-KCl provide a useful model for comparison with more complex Na-K solutions such as the alkali feldspars and micas. Analytic expressions for the solvus or binodal curve bounding a binary two-phase region may be obtained by two distinct methods using observed pairs of coexisting phases. One method is to plot appropriate functions of composition against reciprocal temperature and to obtain Margules parameters by linear least-squares fits to the values plotted. The other method makes use of the near-linear relationships in the critical region between the square of the composition difference between the two phases, the mean composition, and either temperature or reciprocal temperature. The latter method is independent of any specific equation of state such as a Margules formulation--though thoroughly consistent with it. Analysis of the data of (1918), and (1953), and and (1954a) shows that the two methods are in good quantitative agreement in the range 300-500°C.
Thompson Barbara J.
Waldbaum David R.
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