MOSSBAUER-EFFECT OF EU-151 IN EUROPIUM OXALATE AND FLUORIDES

In a short communication [C.I. Wynter et al., Radiochimica Acta 55 (1991) 111.] we reported ''relative broadening factors'' of europium fluoride (EuF3), europium oxide (Eu2O3), europium oxalate decahydrate (Eu2(C2O4)3.10H2O and europium benzoate tetrahydrate Eu(C6H5COO)3.4H2O. Indications of the ''relative broadening factor'' of the oxalate compared to the fluoride suggested that the oxalate may indeed be a better host for the 21.6-keV gamma ray transition than the fluoride. In a continuing search for a better host matrix for this Mossbauer transition, we have prepared additionally a systematic series of fluorides, namely. EuF3, NaEuF4, Na3EuF6, and K3EuF6 to measure the linewidths and compute the ''true'' broadening factor using the natural linewidth of Eu-151 as 1.31 mm/s.