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57 Fe-MÖSSBAUER spectra of the cubic elpasolithes A 2  I NaFeF 6  (A I  = K, Rb, Cs) show strong single line broadening in the temperature range 4.2 K ≤ T ≤ 600 K. This broadening is attributed to a statistical distribution of differently distorted FeF 6  3 -octahedra, causing a statistical distribution of electric fieldgradients at the  57 Fe-position. With the aid of a model calculation it was tried to estimate the order of the octahedral distortion. For the compound Rb 2 NaFeF 6  normal to the cell axis an anion displacement of Δ q = 0.11 Å from the regular octahedral position was derived from the Mössbauer data. This value agrees with the root mean square displacement ū = 0.13 Å, which results in this direction from the strongly anisotropic fluorine temperature factors found by X-ray structure determination.

Untersuchung des MÖSSBAUER-Effekts in Elpasolithen A 2 I NaFeF 6 .: Investigations of the MÖSSBAUER Effekt in Elpasolithes Α 2 I NaFeF 6