Chemical hydrogenation of La(Fe,Si) family of intermetallic compounds

Patryk Włodarczyk , Marcin Polak , Łukasz Hawełek , Maciej Kowalczyk , Marek Hreczka , Aleksandra Kolano-Burian

Abstract

In the present work, the chemical hydrogenation process of La(Fe,Si)13 compounds has been shown. It was found, that the La(Fe,Si) compound can be easily saturated with hydrogen by performing reaction with 0.6 M hydrochloric acid (HCl) for 2 h. After reaction, the heat treatment process is necessary to make hydrogenated powder homogenous. For the LaFe11.8Si1.2 micronized (<50 μm) and hydrogenated powder, the strength of the magnetocaloric effect was estimated by means of magnetocalorimetric measurements on plates consolidated with PVDF thermoplastic polymer. Magnetic entropy change was calculated by use of magnetization data acquired at magnetic fields with induction up to 2T. The adiabatic temperature change is equal to 3 K in magnetic field change 0–1.7T at 335 K, while magnetic entropy change is equal 13 J/kg*K at 2T. The structural homogeneity of initial and hydrogenated powders was validated by powder X-ray diffraction method. The amount of hydrogen in the hydrogenated compounds was evaluated using thermogravimetry method (4 H atoms per formula unit LaFe11.8Si1.2).
Author Patryk Włodarczyk - [Instytut Metali Nieżelaznych (IMN)]
Patryk Włodarczyk,,
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- Instytut Metali Nieżelaznych
, Marcin Polak - Instytut Metali Nieżelaznych (IMN)
Marcin Polak,,
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, Łukasz Hawełek - Instytut Metali Nieżelaznych (IMN)
Łukasz Hawełek,,
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, Maciej Kowalczyk ZMKF
Maciej Kowalczyk,,
- Division of Construction and Functional Materials
, Marek Hreczka - Instytut Metali Nieżelaznych (IMN)
Marek Hreczka,,
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, Aleksandra Kolano-Burian - Instytut Metali Nieżelaznych (IMN)
Aleksandra Kolano-Burian,,
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Journal seriesSolid State Sciences, ISSN 1293-2558
Issue year2016
Vol61
Pages246-251
Publication size in sheets0.5
Keywords in EnglishHeat treatment; Intermetallic compounds; Magnetic properties; Thermal properties; Thermogravimetric analysis
DOIDOI:10.1016/j.solidstatesciences.2016.10.007
Languageen angielski
Score (nominal)25
ScoreMinisterial score [Punktacja MNiSW] = 25.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) [Punktacja MNiSW (2013-2016)] = 25.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2016 = 1.811 (2) - 2016=1.894 (5)
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