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151  Eu Mössbauer spectroscopy permits the determination of the symmetry of the site in which Eu is accommodated. It has been shown that the  151 Sm F 3  source can be considered a monochromatic source. This source was used to measure the line width of Eu 3+  in a site with cubic symmetry, i. e. in a Cs 2 NaEuCl 6  crystal. The isomer shift of commercial compounds used as standards (anhydrous EuF 3  and EuS) was also measured. In the case of Cs 2 NaEu(N O 2 ) 6  hexanitritoelpasolite the trivalent europium ion is accommodated in a site with perfect cubic symmetry. In Eu(PO 3 ) 3  crystalline metaphosphate, the rare earth is located in a site which appears to be distorted with respect to cubic symmetry; this site has no threefold or fourfold symmetry axis.

Investigation of Structural Questions on Europium Compounds by Means of 151 Eu Mössbauer Spectroscopy