Other
Scientific paper
Sep 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..945w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 34, Issue 9, pp.945-956
Other
56
Scientific paper
The ionic radii proposed by and as the effective values in oxides and fluorides have been analysed for their conformity with the radius ratio principles of crystal chemistry. It is shown that a set of values intermediate between the "IR" and "CR" values of and provides the best conformity in this respect, and a table of the values adopted is provided in periodic form. These values correspond to a VI co-ordinate oxygen radius of 1.32 Å and a VI co-ordinate fluorine radius of 1.25 Å, and the radii of the cations are therefore appreciably larger than those previously accepted, although not as large as and 's "CR" values. It is suggested that the radii obtained are the most suitable for use in silicate geochemistry, and constitute a major improvement over previous values for this particular purpose. Although it is impossible to maintain the accuracy with which radius sums represent interatomic distances and at the same time to extend the range of the radii to other anions, it seems desirable to provide compatible (although only very approximate) values of radii for Cl, Br, I, S and Se anions. Use of the new cation radii with these anion radii cannot be expected to be an improvement over the use of older radii, but should be about as satisfactory. The changes of cation radii relative to one another, as compared with radii, are tabulated in order to draw attention to their possible geochemical significance, and the implications are discussed in the case of scandium.
Muntus R.
Whittaker J. W. E.
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