Abstract
The coordination numbers for the samarium atoms and the SmO bond distances in SrB 4O 7:Sm and SrB 6O 10:Sm prepared in air were determined by means of Sm-L 3 edge EXAFS. The coordination was found to be nine-folded for both these hosts and the bond distance was 2.40–2.42 Å in SrB 4O 7:Sm and 2.42–2.44 Å in SrB 6O 10:Sm. For SrB 4O 7:Sm the coordination number is coincident with that of the strontium atoms suggesting the substitution of the samarium atoms at the strontium sites. The coordination number of the strontium atoms in SrB 6O 10 was also suggested to be nine assuming the same type of substitution. The valences of samarium were determined from the luminescent spectra. Both divalent and trivalent ions were present in both SrB 4O 7:Sm and SrB 6O 10:Sm, while the fraction of Sm 2+ was higher in the former than in the latter. This difference has been assigned to the difference in rigidity between the BO networks in these structures.
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