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The law of constant rejectionImprovements in analytical technique, study of multielement partitioning in natural systems, and improvements in ionic radius values have permitted construction of Onuma diagrams, in which the logarithm of partition coefficient is plotted versus ionic radius. The optimum radii, corresponding to crystallographic sites, do change in response to changes in major element composition for any particular mineral-type. In natural systems elements compete for sites rather than substituting for another element. It is proposed on empirical grounds, for equilibrium ionic bonding, that Onuma diagram curves for a particular lattice site are parabolic near optimum radius, linear elsewhere, parallel for different valences, and mirror images on opposite sides of optimum. Deviations may be due to overlapping peaks, liquid structure, polyvalence, bonding differences, contamination, kinetics, alteration, etc. However, dominant crystal-chemical control is indicated.
Document ID
19780060586
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Philpotts, J. A.
(Hawaii, University Honolulu, Hawaii, United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1978
Subject Category
Inorganic And Physical Chemistry
Accession Number
78A44495
Funding Number(s)
CONTRACT_GRANT: NSG-5203
Distribution Limits
Public
Copyright
Other

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