Untersuchung eines Li-Cr-Ferrits mit Hilfe des Mößbauer-Effekts |
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Authors: | Gerhard Ritter |
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Institution: | 1. Physikalischen Institut der Universit?t Erlangen-Nürnberg, Deutschland
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Abstract: | The hyperfine-structure spectra of the 14.4 keVγ-ray of the nucleus57Fe in the spinel type ferrite (Li 05 + Fe 1.3 3+ Cr 1.2 3+ O 4 2? ) 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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