Abstract
The hyperfine-structure spectra of the 14.4 keVγ-ray of the nucleus57Fe in the spinel type ferrite (Li +05 Fe 3+1.3 Cr 3+1.2 O 2−4 ) have been measured through the use of the Mößbauer effect. These measurements were performed on powder samples at different temperatures between 88 °K and 633 °K. For the Fe3+ ions at both the tetrahedral (A) and octahedral (B) sites at 88 °K the effective magnetic fieldH at the Fe nuclei is the same and equal to 504±4 kG. The temperature dependence ofH A however is different fromH B . Application of an external magnetic field of 20 kG shows that the sign ofH A is positive and the sign ofH B is negative. As the temperature is increased a considerable broadening of the magnetic hfs-lines (and especially of the outer pair of lines) is observed. No theoretical discussion directly applicable to these measurements is as yet available. In the paramagnetic phase a well resolved doublet is obtained. It appears that this doublet must be interpreted as a quadrupole splitting.
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Herr Prof. Dr. H.Wegener hat diese Arbeit angeregt und durch zahlreiche Diskussionen viel zum Fortgang der Arbeit beigetragen. Ich bin ihm dafür zu großem Dank verpflichtet. Meinen Kollegen V.Beckmann, D.Seyboth und R.Stock danke ich für ihre Hilfe bei den Rechnungen an der Zuse Z23 und beim Aufbau der Apparatur.
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Ritter, G. Untersuchung eines Li-Cr-Ferrits mit Hilfe des Mößbauer-Effekts. Z. Physik 189, 23–32 (1966). https://doi.org/10.1007/BF01343317
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DOI: https://doi.org/10.1007/BF01343317