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Magnetic Hardening of Mechanically Alloyed Pr2Co7

Published online by Cambridge University Press:  29 May 2012

L. Bessais ,
R. Fersi ,
M. Cabié  and
N. Mliki
L. Bessais
Affiliation:
CMTR, ICMPE, UMR7182, CNRS – UPEC, 2-8 rue Henri Dunant F-94320 Thiais, France,
R. Fersi
Affiliation:
CMTR, ICMPE, UMR7182, CNRS – UPEC, 2-8 rue Henri Dunant F-94320 Thiais, France, LMOP, Faculty of Science of Tunis, University of Tunis El Manar, Tunisia,
M. Cabié
Affiliation:
CP2M, University Paul Cezanne, F-13397 Marseille, France
N. Mliki
Affiliation:
LMOP, Faculty of Science of Tunis, University of Tunis El Manar, Tunisia,
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Abstract

The Pr2Co7 alloys are known to crystallize in two polymorphic forms: a hexagonal of the Ce2Ni7 type structure and a rhombohedral of the Gd2Co7 one. They were synthesized by mechanical milling and subsequent annealing in high vacuum. In this work, we focus on the structural study of these phases using X-ray diffraction and transmission electron microscopy. Also, we present the evolution of magnetic properties of these compounds vs the annealing temperature. The coercivity increases with annealing temperature reaching a maximum for TA = 800 °C. The highest is equal to 18 kOe at 293 K and 23 kOe at 10 K. The high magnetic properties observed in these nanostructured Pr2Co7 intermetallic alloys have their origin in its relatively high uniaxial magnetocrystalline anisotropy field, and in the homogeneous nanostructure developed by mechanical milling process and subsequent annealing. This high coercivity is attributed to the high anisotropy field of the Pr2Co7 phase and its nanoscale grain size. This leads to the formation of a magnetically hard Pr2Co7 phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1471: Symposium YY – Rare-Earth-Based Materials , 2012 , mrss12-1471-yy06-04
Copyright
Copyright © Materials Research Society 2012

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References

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