| Autor: |
Terzieff, Peter, Schicketanz, Heinrich, Komarek, Kurt L. |
| Zdroj: |
Monatshefte für Chemie / Chemical Monthly; May 1982, Vol. 113 Issue: 5 p519-527, 9p |
| Abstrakt: |
The magnetic structure of NiAs-type Fe1-xSe is made up by two sets of oppositely aligned ferromagnetic layers parallel to the hexagonal (001) plane. The imbalance of the sublattice magnetizations resulting in ferrimagnetism is usually attributed to the ordered arrangement of the metal vacancies. The results of the present paper provide a direct experimental proof of the correlation between the crystallographic order and the magnetic properties. It could not be distinguished whether the observed effects on the magnetization are due to a combined ordering of vacancies and Fe3+ ions or to the ordering of the Fe3+ ions only. Partial disorder was obtained by quenching samples of Fe0.89Se from temperatures high enough to destroy the ordered arrangement. As inferred from the magnetization data the order parameter varied from 0.83 to 0.47 according to quenching temperatures ranging from 670 K to 1 270 K. In contrast to the magnetization the ferri-antiferromagnetic transformation occurred invariantly at about 170 K irrespective of the different degree of order. The thermoelectric power was positive and increased with decreasing temperature reaching +49µVK-1 at 85 K. The discontinuity observable at about 170 K coincides roughly with the magnetic transformation indicating magnetic contributions to the thermoelectric power. |
| Databáze: |
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