<abstract xmlns="http://www.w3.org/1999/xhtml">The aim of the presented paper is to study an influence of replacement of Fe atoms by Si atoms in quasibinary Sc(Fe1−<italic>x</italic>Si<italic>x</italic>)2 Laves phases on their structural and magnetic properties. Powder X-ray diffraction (XRD) and neutron diffraction (ND) measurements carried out at different temperatures from 4.3 K up to about 700 K revealed that samples were single phase with cubic <italic>C</italic>15 structure for Si concentration <italic>x</italic> from 0.05 to 0.20 and hexagonal <italic>C</italic>14 structure for higher concentration. The results of 57Fe Mössbauer measurements showed that the Sc(Fe1−<italic>x</italic>Si<italic>x</italic>)2 compounds with <italic>x</italic> ≤ 0.30 are ferrimagnetic at 4.3 K. At temperature 80 K in the samples with <italic>x</italic> = 0.20 and 0.30, a magnetic cluster spin-glass state has been observed, as ferrimagnetic long-range order disappears. Such picture was supported by the results of ND measurements carried out at 8 K, which confirmed the lack of long-range order for <italic>x</italic> above 0.10 and an occurrence of hyperfine field distributions in the corresponding Mössbauer spectra. At room temperature, samples with <italic>x</italic> ≥ 0.20 became paramagnetic. A substitution of Si atoms for Fe ones leads to a decreasing of mean values of hyperfine magnetic fields in samples under investigation. From the neutron diffraction pattern analysis of Sc(Fe0.90Si0.10)2Fe magnetic moment was determined as to be equal to 1.5 μB at 8 K. Combining this result with a value of hyperfine magnetic field on 57Fe probes, the hyperfine coupling constant A in Sc(Fe0.90Cu0.10)2 phases is estimated at about 11.6 T/μB at 8 K.</abstract>

The aim of the presented paper is to study an influence of replacement of Fe atoms by Si atoms in quasibinary Sc(Fe1−xSix)2 Laves phases on their structural and magnetic properties. Powder X-ray diffraction (XRD) and neutron diffraction (ND) measurements carried out at different temperatures from 4.3 K up to about 700 K revealed that samples were single phase with cubic C15 structure for Si concentration x from 0.05 to 0.20 and hexagonal C14 structure for higher concentration. The results of 57Fe Mössbauer measurements showed that the Sc(Fe1−xSix)2 compounds with x ≤ 0.30 are ferrimagnetic at 4.3 K. At temperature 80 K in the samples with x = 0.20 and 0.30, a magnetic cluster spin-glass state has been observed, as ferrimagnetic long-range order disappears. Such picture was supported by the results of ND measurements carried out at 8 K, which confirmed the lack of long-range order for x above 0.10 and an occurrence of hyperfine field distributions in the corresponding Mössbauer spectra. At room temperature, samples with x ≥ 0.20 became paramagnetic. A substitution of Si atoms for Fe ones leads to a decreasing of mean values of hyperfine magnetic fields in samples under investigation. From the neutron diffraction pattern analysis of Sc(Fe0.90Si0.10)2Fe magnetic moment was determined as to be equal to 1.5 μB at 8 K. Combining this result with a value of hyperfine magnetic field on 57Fe probes, the hyperfine coupling constant A in Sc(Fe0.90Cu0.10)2 phases is estimated at about 11.6 T/μB at 8 K.

Magnetic and structural properties of Sc(Fe1−xSix)2 Laves phases studied by Mössbauer spectroscopy and neutron diffraction

Institute of Physics, M. Curie-Skłodowska University, 1. M. Curie-Skłodowskiej Sq., 20-031 Lublin, Poland, Tel.: +48 81 537 6220, Fax: +48 81 537 6191

Frank Laboratory of Neutron Physics Joint Institute for Nuclear Research, 141980 Dubna, Russia

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Magnetic and structural properties of Sc(FeSi) Laves phases studied by Mössbauer spectroscopy and neutron diffraction

The aim of the presented paper is to study an influence of replacement of Fe atoms by Si atoms in quasibinary Sc(Fe1−xSix)2 Laves phases on their structural...

Magnetic and structural properties of Sc(Fe_1−xSi_x)₂ Laves phases studied by Mössbauer spectroscopy and neutron diffraction

Publié en ligne: 12 mars 2015

Pages: 155 - 160

Reçu: 18 juin 2014

Accepté: 05 nov. 2014

DOI: https://doi.org/10.1515/nuka-2015-0032

Mots clés
hyperfine fields, Mössbauer effect, neutron diffraction, quasibinary Laves phase

© Marek Wiertel, Zbigniew Surowiec, Mieczysław Budzyński, Jan Sarzyński, Anatoly I. Beskrovnyi

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Magnetic and structural properties of Sc(Fe1−xSix)2 Laves phases studied by Mössbauer spectroscopy and neutron diffraction

Publié en ligne: 12 mars 2015

Pages: 155 - 160

Reçu: 18 juin 2014

Accepté: 05 nov. 2014

DOI: https://doi.org/10.1515/nuka-2015-0032

Mots cléshyperfine fields, Mössbauer effect, neutron diffraction, quasibinary Laves phase

© Marek Wiertel, Zbigniew Surowiec, Mieczysław Budzyński, Jan Sarzyński, Anatoly I. Beskrovnyi

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Magnetic and structural properties of Sc(Fe_1−xSi_x)₂ Laves phases studied by Mössbauer spectroscopy and neutron diffraction

Mots clés
hyperfine fields, Mössbauer effect, neutron diffraction, quasibinary Laves phase