The dispersed state of iron ions in LiF and NaF is studied by absorber Mossbauer spectroscopy for the first time. Crystals containing low concentrations of Fe57 and quenched from high temperatures show spectra consisting of symmetric quadrupole split doublets indicative of iron ions in a divalent charge state. The absorber spectra show marked differences with the corresponding source spectra of LiF : CoS7 and NaF : CoS7. Aftereffects of the decay of Co5' are believed to be responsible for the difference in source and absorber spectra. E s wird der ausgedehnte Zustand von Eisenionen in LiF und Na,F mit Absorber-MoBbauerspektroskopie erstmalig untersucht. Kristalle mit niedrigen Konzentrationen von FeS7 und von hohen Temperaturen abgeschreckt zeigen Spektren, die aus symmetrischen quadrupolaufgespaltenen Dubletts bestehen und fur Eisenionen im zweiwertigen Zustand charakteristisch sind. Die Absorberspektren zeigen merkliche Abweichungen von den entsprechenden Quellenspektren von LiF : co57 und NaF: Cos7. Es wird angenommen, daB Nachwirkungseffekte des Abklingens von co57 fur die Unterschiede der Quellen-und Absorberspektren verantwortlich sind.1st
Results are reported of the first detailed Mössbauer study of the precipitation phenomenon in alkali halides doped with iron concentrations ranging from 100 ppm to a few mole per cent. At low doping levels in LiF a non‐cubic precipitate is seen coexisting with aggregates of FeF2. In NaF, three precipitates, including a cubic superlattice structure (Suzuki phase), are identified. The results are supported by powder X‐ray diffraction and electron microscopy.
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