Intrinsic and extrinsic magnetic properties of nanocrystalline Pr2(Co, Fe)7. Issue 4 (22nd January 2014)

• Record Type: Journal Article
• Authors: Fersi, R.; Mliki, N.; Cabié, M.; Bessais, L.
• Is Part Of: Physica status solidi. Volume 211:Issue 4(2014:Apr.)
• Page Start: 910
• Page End: 916
• Publication Date: 2014-01-22
• Subjects: Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201330259
• Languages: English
• ISSNs: 1862-6300

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="pssa201330259-sec-0001" sec-type="section"> <p>In this work, we present a study focused on the effect of partial substitution of Co by Fe on structure and magnetic properties of nanocrystalline Pr<sub>2</sub>Co<sub>7</sub>. These compounds were synthesized by mechanical alloying and to correlate their properties with microstructural evolution, a multi‐scale study by: X‐ray diffraction (XRD), transmission electron microscopy, and magnetization was carried out. The Rietveld analysis of XRD diagrams shows that Pr<sub>2</sub>Co<sub>7−<italic>x</italic></sub>Fe<sub><italic>x</italic></sub>, annealed at 973 K, mainly adopt a hexagonal Ce<sub>2</sub>Ni<sub>7</sub> type structure with <italic>P</italic>6<sub>3</sub>/<italic>mmc</italic> space group. These pseudo‐ternary compounds exhibit more interesting magnetic properties than the binary Pr<sub>2</sub>Co<sub>7</sub> compounds. A systematic study of the intrinsic magnetic properties of these alloys shows that the substitution leads to enhancement of the Curie temperatures (<italic>T</italic><sub>C</sub>) by 26% for a Fe content equal to 0.5. This increase is due to the electronic as well as the magnetovolume effects. In addition, the study of extrinsic magnetic properties of the Pr<sub>2</sub>Co<sub>6.5</sub>Fe<sub>0.5</sub> compound has revealed the existence of a large coercive field <italic>H</italic><sub>c</sub>, and a high remanent magnetization <italic>M</italic><sub>r</sub>. Our results show that in these alloys, iron in solid solution has a strong effect on hardness and ordering temperature, which is particularly promising for permanent magnet applications.</p> </sec> </abstract>