thesis, Duke University, 1960 (unpublished).'2For the definition of the exponents 0. and n' for the case of a superfluid, see L. P. Kadanoff et al. , Rev.

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Mossbauer studies are carried out for divalent europium as dopant in the fluorites CaF,, SrF,, and BaF,. The lslEu Mossbauer isomer shift in these materials increases, increases and decreases, respectively, as the Eu2+ concentration decreases below a few mole percent. Previous explanations of these effects as due to lattice pressure or host covalency are found t o be wrong. Instead these trends are interpreted as primarily due to variations in the admixture of t,he prevalent defect structure of E U~+ O : -F~-~~ (i = 1, 2 , 3 , or 4) which stabilizes the Eu2+ in these crystals. Mossbauerstudien werden fur zweiwertiges Europium als Dotierung in den Fluoriten

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