Chemical hydrogenation of La(Fe,Si) family of intermetallic compounds
Patryk Włodarczyk , Marcin Polak , Łukasz Hawełek , Maciej Kowalczyk , Marek Hreczka , Aleksandra Kolano-Burian
AbstractIn 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).
|Journal series||Solid State Sciences, ISSN 1293-2558|
|Publication size in sheets||0.5|
|Keywords in English||Heat treatment; Intermetallic compounds; Magnetic properties; Thermal properties; Thermogravimetric analysis|
|Score|| = 25.0, 28-11-2017, ArticleFromJournal|
= 25.0, 28-11-2017, ArticleFromJournal
|Publication indicators||: 2016 = 1.811 (2) - 2016=1.894 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.