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Structural and magnetic properties of Sc1.1Fe3.9Al8 alloy |
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| Authors: | K Re?ko L Dobrzyński A SenyshynH Fuess K SzymańskiB Yu Kotur W Suski |
| Institution: | a Faculty of Physics, University of Bialystok, Lipowa 41, 15-424 Bialystok, Poland b The Soltan Institute for Nuclear Studies, 05-400 Otwock-Swierk, Poland c Technische Universität Darmstadt, Institute of Materials Science, Petersenstr. 23, Darmstadt 64287, Germany d Department of Inorganic Chemistry, Ivan Franko National University of Lviv, 79005 L'viv, Ukraine e Polish Academy of Sciences, W. Trzebiatowski Institute of Low Temperatures and Structures Research, P.O. Box 1410, 50-950 Wroclaw 2, Poland f International Laboratory of High Magnetic Fields and Low Temperatures, ul. Gajowicka 95, 53-421 Wroclaw, Poland |
| Abstract: | The crystallochemical and magnetic nature of ternary Sc1+δFe4−δAl8 intermetallic with a small Sc excess δ=0.1 was investigated by scanning electron microscope, X-ray powder diffraction, neutron diffraction, Mössbauer effect and superconducting quantum interference device techniques. The sample crystallizes in a tetragonal ThMn12 type structure. The excess of Sc atoms substitute Fe at the (8f) positions and have a pronounced effect on the magnetic properties. The experiments carried out in temperature range 4-320 K show that below 120 K the magnetic structure of the alloy forms a double cycloid with magnetic moments rotating according to the incommensurate in-plane wave vector, which is temperature independent up to 160 K. The value of Fe magnetic moment is close to 0.9 μB atom−1 at 4 K. Temperature dependence of unit cell dimensions can be explained within the Debye-Grüneisen approximation. |
| Keywords: | ThMn12 structure Incommensurate magnetic structure Neutron diffraction |
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