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Fe-Ga-absorbers, bcc-unordered at 20 °C, with 25.7, 27.0, and 28.3 at-% Ga were analyzed up to 720 °C with the Mössbauer effect in order to clear disagreements of former experiments of us with the then known phase diagrams. We found proofs for an ordering transition A 2  -DO 3  between 180 and 260 °C, a transition DO 3  -Ll 2  between 280 and 380 °C, a transition Ll 2  -DO 19  in a small temperature interval at 610 °C, and a further one DO 19  - DO 3  (or DO 19 -B 2 ) at 630 °C. The temperature dependence of the magnetically induced Ll 2 -field gradient q was analyzed. Probably q is negative, while the direction of the magnetic field is parallel [1, 0, 0] in agreement with other experiments at low temperatures. Above 630 °C there seems to exist a further so far unknown ordered phase, which is probably non-cubic with at least two different Fe-sites. Our results are in considerable agreement with recently published phase diagrams, though some of our spectra allow different interpretations.

zeitschrift für naturforschung a

Nachweis der verschiedenen Phasen und Phasenübergänge des Systems Fe-Ga im Konzentrationsbereich 25,7 bis 28,3 At-% Ga bei Temperaturen von 20 °C bis 720 °C mit Hilfe des Mössbauer- Effekts