Abstract
The cobalt-57 emission Mössbauer spectrum of Nd 2(Fe, 57Co) 14B has been analyzed with a model previously used to study Nd 2Fe 14B and related compounds. The preferential cobalt occupancies in Nd 2Fe 14B, obtained from the relative intensities of the six sextets used to fit the emission spectrum, show a virtually perfect linear correlation with the Wigner-Seitz cell volume of each of the six iron sites. Thus it would appear that the preferential site substitution of cobalt is controlled by the volume of the crystallographic site and the metallic radius of cobalt. This linear correlation provides support for the assignment of the weak sites in the Mössbauer spectrum of Nd 2Fe 14B.
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