Thermodynamic, structural and magnetic properties of LaNi5 − x Fe x hydrides
Identifieur interne : 000591 ( France/Analysis ); précédent : 000590; suivant : 000592Thermodynamic, structural and magnetic properties of LaNi5 − x Fe x hydrides
Auteurs : Jilani Lamloumi [Tunisie] ; A. Percheron-Guegan ; C. Lartigue ; J. C. Achard ; G. Jehanno [France]Source :
- Journal of The Less-Common Metals [ 0022-5088 ] ; 1987.
Abstract
Thermodynamic, structural and magnetic properties of LaNi5 − xFex hydrides were investigated. The hydrogen absorption and desorption isotherms were determined in the temperature range 25–60 °C using an incremental volumetric method. The substitution of iron for nickel induced a decrease of the plateau pressure and of the hydrogen content.Neutron diffraction measurements showed that the deuteride LaNi4-FeD5.1 has the same structure as the intermetallic compound, the deuterium atoms being distributed over three interstitial sites (6m, 12n and 4h). Hydrogen absorption in LaNi5 − xFex led to a reduction in the magnetization. The Mössbauer spectra of the hydride LaNi4FeH5.3 above the magnetic ordering temperature consisted of a superposition of two quadrupole doublets. The isomer shift was higher than that of the corresponding intermetallic compound.
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DOI: 10.1016/0022-5088(87)90093-2
Affiliations:
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The hydrogen absorption and desorption isotherms were determined in the temperature range 25–60 °C using an incremental volumetric method. The substitution of iron for nickel induced a decrease of the plateau pressure and of the hydrogen content.Neutron diffraction measurements showed that the deuteride LaNi4-FeD5.1 has the same structure as the intermetallic compound, the deuterium atoms being distributed over three interstitial sites (6m, 12n and 4h). Hydrogen absorption in LaNi5 − xFex led to a reduction in the magnetization. The Mössbauer spectra of the hydride LaNi4FeH5.3 above the magnetic ordering temperature consisted of a superposition of two quadrupole doublets. 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