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Preprint
Reactive single-step hot-pressing and magnetocaloric performance of polycrystalline Fe$_2$Al$_{1.15-x}$B$_2$Ge$_x$Ga$_x$ ($x=0, 0.05$) MAB phases
ArXiv.org
14 Apr 2023
Abstract
Reactive single-step hot-pressing at 1473 K and 35 MPa for 4 h produces dense, bulk, near single-phase, low-cost and low-criticality Fe$_2$Al$_{1.15}$B$_2$ and Fe$_2$Al$_{1.1}$B$_2$Ge$_{0.05}$Ga$_{0.05}$ MAB samples, showing a second-order magnetic phase transition with favorable magnetocaloric properties around room temperature. The magnetic as well as magnetocaloric properties can be tailored upon Ge and Ga doping, leading to an increase of Curie temperature $T_C$ and spontaneous magnetization $m_S$. The maximum isothermal entropy change $\Delta s_{T,max}$ of hot-pressed Fe$_2$Al$_{1.15}$B$_2$ in magnetic field changes of 2 and 5 T amounts to 2.5 and 5 J(kgK)$^{-1}$ at 287.5 K and increases by Ge and Ga addition to 3.1 and 6.2 J(kgK)$^{-1}$ at 306.5 K, respectively. The directly measured maximum adiabatic temperature change $\Delta T_{ad,max}$ is improved by the composition modification from 0.9 to 1.1 K in magnetic field changes of 1.93 T. Overall, we demonstrate that hot-pressing provides a much faster, more scalable and processing cost reducing alternative compared to conventional synthesis routes to produce heat exchangers for magnetic cooling devices. Therefore, our criticality assessment shows that hot-pressed Fe-based MAB phases provide a promising compromise of material and processing cost, criticality and magnetocaloric performance, demonstrating the potential for low-cost and low-criticality magnetocaloric applications around room temperature.
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Details
- Title
- Reactive single-step hot-pressing and magnetocaloric performance of polycrystalline Fe$_2$Al$_{1.15-x}$B$_2$Ge$_x$Ga$_x$ ($x=0, 0.05$) MAB phases
- Creators
- Benedikt Beckmann - Technical University of DarmstadtTarek A El-Melegy - Drexel UniversityDavid Koch - Technical University of DarmstadtUlf Wiedwald - University of Duisburg-EssenMichael Farle - University of Duisburg-EssenFernando Maccari - Technical University of DarmstadtJoshua Snyder - Drexel UniversityKonstantin P Skokov - Technical University of DarmstadtMichel W Barsoum - Drexel UniversityOliver Gutfleisch - Technical University of Darmstadt
- Publication Details
- ArXiv.org
- Resource Type
- Preprint
- Language
- English
- Academic Unit
- Materials Science and Engineering; Chemical and Biological Engineering
- Other Identifier
- 991020411480504721