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Effect of Hydrogenation on Physical Properties of TiMn₂ type Alloy

Abstract

TiMn₂ type alloys are considered as promising candidates for hydrogen storage materials. In this paper structural, morphological and magnetic properties of TiMn₂ type alloy, before and after hydrogenation, were experimentally studied. The TiMn₂ type alloy was hydrogenated under 50 bar hydrogen gas pressure. Structural and morphological properties of samples were investigated using X-Ray Diffraction (XRD) analysis and Field Emission Scanning Electron Microscope (FESEM) images. X-ray diffraction spectra showed the as-prepared and hydrogenated samples were both characterized as laves phases C14 with a hexagonal crystal structure (space group P63/mmc). The FESEM images illustrated the average grain size decreased, and sample surface was rather uniform after hydrogenation. Magnetic behavior of samples was checked using a Vibrating Sample Magnetometer (VSM) and depicted the samples are paramagnetism. The results obtained from Honda-Arrott plots indicated the magnetic susceptibility increases from 4.70^*10^-6 emu/g.Oe for as-prepared to 6.84^*10^-6 emu/g.Oe for hydrogenated sample.

Mehdi Afshari Abolkarlou

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