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Pseudo Fine Particle Effect on Unstable Phase Transition of Gd2Al

Published online by Cambridge University Press:  21 September 2018

A. Yazdani ,
N. Kamali Sarvestani  and
R. Osaty Araghi
A. Yazdani
Affiliation:
Tarbiat Modares University, Jalal Al Ahmad Exp. way, P.O. Box: 14115-175, Tehran, Iran
N. Kamali Sarvestani
Affiliation:
Tarbiat Modares University, Jalal Al Ahmad Exp. way, P.O. Box: 14115-175, Tehran, Iran
R. Osaty Araghi
Affiliation:
Tarbiat Modares University, Jalal Al Ahmad Exp. way, P.O. Box: 14115-175, Tehran, Iran
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Abstract

The unusual duality of magnetic phase transition (especially high transition temperature, remarkable shoulder) is thought to be due to second phase impurities of pure Gd or Gd3Al2 or even both. The temperature dependence and field dependence of magnetization have been studied in the temperature range of 4.2-350 K in three different strengths of magnetic field to investigate the cause or/and the source of metamagnetic character which is a puzzle on Gdintermetallic compounds, IMC, in order to find the critical field needed to overcome the fluctuation field, above which the magnetic behavior of the system is stabilized, and a critical turning field is defined.

However for the clearance of intrinsic instability behavior and the nature (and source) of anisotropy in the Gd2Al system, the following experimental works has been prepared.

The study of the effect of increasing the magnetic field up to the critical “threshold“ field which is exactly the same as decreasing the conduction electron concentration “c.e.c” from Gd2Al to Gd2Au; The contribution of short range order as well as thermal fluctuation of short range exchange “Jsh” through the long – range interaction “Jl” which can be induced by localized s-f (or d-f) exchange. This effect can be the cause (or the source) of internal magnetic field Hin=<Si.Sj> and fluctuation field Hf=Hin-Hext.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U05-57
Copyright
Copyright © Materials Research Society 2009

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References

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