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Effect of texturing on thermal, electric and elastic properties of MoAlB, Fe2AlB2, and Mn2AlB2
Journal article   Open access

Effect of texturing on thermal, electric and elastic properties of MoAlB, Fe2AlB2, and Mn2AlB2

Sankalp Kota, Matthias T. Agne, Kazuki Imasato, Tarek Aly El-Melegy, Jiayi Wang, Christine Opagiste, Yexiao Chen, Miladin Radovic, G. Jeffrey Snyder and Michel W. Barsoum
Journal of the European Ceramic Society, v 42(7), pp 3183-3191
Jul 2022
DOI: https://doi.org/10.1016/j.jeurceramsoc.2022.02.024
url
https://doi.org/10.1016/j.jeurceramsoc.2022.02.024View
Accepted (AM)Open Access (Publisher-Specific),  Open

Abstract

Fe2AlB2 MAB phases MoAlB Textured ceramics Thermoelectric properties
Herein, MoAlB, Fe2AlB2, and Mn2AlB2 with textured microstructures were sinter-forged from pre-reacted preforms in a hot press at 1400, 1200, and 1050 °C, respectively. X-ray diffraction and energy dispersive X-ray spectroscopy confirmed the textured nature and high phase purities. The effect of texturing on the thermoelectric properties was evaluated by measuring thermal diffusivities, electrical resistivities, and Seebeck coefficients on the sinter-forged samples and those of less textured, reactively hot-pressed samples. While the thermoelectric properties were essentially isotropic for sinter-forged Fe2AlB2 and Mn2AlB2, differences included electron-dominated thermal transport in Fe2AlB2 and phonon-dominated transport in Mn2AlB2 over most of the 323–873 K range. Magnetic phase transitions at 281 K in Fe2AlB2 and 308 K in Mn2AlB2 were identified in electrical resistivity measurements. MoAlB was found to have anisotropic thermoelectric properties, with notably small relative Seebeck coefficients ranging from − 2 μV/K at 323 K and increasing to 5 μV/K at 873 K. •MoAlB, Fe2AlB2, and Mn2AlB2 were sinter-forged to make textured materials at 1400, 1200, and 1050 °C, respectively.•The anisotropy of the thermoelectric properties depends on both the crystal structure and M-element.•The textured Mn2AlB2 and Fe2AlB2 materials had isotropic thermoelectric properties.•For MoAlB, thermal and electrical conductivities were higher perpendicular and parallel to the basal planes, respectively.

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Materials Science, Ceramics
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