Crystal structures in nanograined-Fe2VAl polycrystals for thermoelectric applications
Fe2VAl could become a good thermoelectric material if its thermal conductivity could be reduced. This can be achieved by synthesizing Fe2VAl under nanograined (~ 100 nm) form. But this leads to a decrease of its Seebeck coefficient and thus, to poor thermoelectric properties. To understand this opposite effect, we undertook a neutron diffraction experiment (9/9/2020, CRG-2769) on D1B to determine as a function of temperature (25 – 900°C) the crystalline structures adopted by nanograined-Fe2VAl after ball-milling: disordered structures could indeed lead to low Seebeck values. A rapid examination of our data shows that at 25°C, ball-milled Fe2VAl crystallizes in the disordered A2 structure. Upon heating, it orders successively in the B2 and L21 (fully ordered) structures around 300°C - 400°C respectively. Unfortunately, an uncontrollable ramp of the high- temp. furnace prevented us from accurately measuring the temperature of these irreversible transitions. In order to finish this study with publishable data, we hence require an extra beam time (12 – 24h) on D1B equipped with the better controllable 25 - 500°C furnace to measure a new sample prepared under the same conditions.
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ALLENO Eric; LAVERSENNE Laetitia; NASSIF Vivian and PUENTE ORENCH Ines. (2021). Crystal structures in nanograined-Fe2VAl polycrystals for thermoelectric applications. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-724
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