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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

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1865-7117
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Volume 71, Issue 5

Issues

Influence of hydrogenation and mechanical grinding on the structural and ferromagnetic properties of GdFeSi

Bernard Chevalier
  • Corresponding author
  • CNRS, Université de Bordeaux, ICMCB, 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac, France
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Mathieu Duttine
  • CNRS, Université de Bordeaux, ICMCB, 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac, France
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Alain Wattiaux
  • CNRS, Université de Bordeaux, ICMCB, 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac, France
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Published Online: 2016-03-16 | DOI: https://doi.org/10.1515/znb-2015-0225

Abstract

Hydrogen insertion into GdFeSi induces (i) a structural transition from a tetragonal CeFeSi-type to a tetragonal ZrCuSiAs-type, (ii) an anisotropic expansion of the unit cell parameters because the a parameter decreases, whereas the c parameter increases, and (iii) a decrease in Curie temperature from 121 to 20 K. On the contrary, an amorphous ferromagnet (TC = 65 K) is obtained by mechanical grinding of GdFeSi. The three compounds (GdFeSi, GdFeSiH, and amorphous GdFeSi) were investigated by 57Fe Mössbauer spectroscopy. At 4.2 K, this study has revealed that the magnetically ordered Gd substructure produces a small transferred hyperfine magnetic field at the 57Fe nucleus.

Keywords: hydrogenation; magnetization; mechanical grinding; Mössbauer spectroscopy

Dedicated to: Professor Wolfgang Jeitschko on the occasion of his 80th birthday.

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About the article

Corresponding author: Bernard Chevalier, CNRS, Université de Bordeaux, ICMCB, 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac, France, e-mail:


Received: 2015-12-15

Accepted: 2016-01-10

Published Online: 2016-03-16

Published in Print: 2016-05-01


Citation Information: Zeitschrift für Naturforschung B, Volume 71, Issue 5, Pages 419–424, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-2015-0225.

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