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Effect of Chromium Substitution for Iron on the Magnetic and Structural Properties of (TmxPr1– x)2Fe17

  • ELECTRICAL AND MAGNETIC PROPERTIES
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Abstract

The (TmxPr1 – x)2Fe17 and (TmxPr1 – x)2Fe16.5Cr0.5 compounds crystallize with the formation of the rhombohedral Th2Zn17-type structure for the compositions with x = 0–0.4 and the hexagonal Th2Ni17-type structure for the compositions with x = 0.8–1 and x = 0.75–1, respectively. Both structures coexist in the (TmxPr1 – x)2Fe17 and (TmxPr1 – x)2Fe16.5Cr0.5 compounds with x = 0.5–0.75 and x = 0.5–0.6, respectively. The (TmxPr1 – x)2Fe17 compositions with 0 < x < 0.6 are ferrimagnets; at x = 0.6–1, additionally a high-temperature helical magnetic state is realized. The substitution of chromium for iron leads to the transformation of the helimagnet to ferrimagnet; in this case, the difference between the Curie temperatures of rhombohedral and hexagonal phases is unexpectedly high (25–28 К). For the composition with x = 0.8, the Curie and Néel temperatures and the ferrimagnet–helimagnet transformation temperature are minimum, and the microdeformations are maximum. The overlap of two peaks in –ΔSM(T), which correspond to the magnetic entropy change at two magnetic phase transformation temperatures, favors the realization of the higher cooling capacity of the two-phase compositions as compared to that of neighboring single-phase compositions.

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ACKNOWLEDGMENTS

The study was performed using equipment available in the Magnetometric Center and Division of Mechanical Tests in the Collective Usage Testing Center for Nanotechnologies and Advanced Materials at the Institute of Metal Physics, Ural Branch, Russian Academy of Sciences. We thank A.V. Protasov for the assistance in performing measurements.

Funding

This study was performed in terms of state assignment (themes Magnit, no. АААА-А18-118020290129-5 and Potok no. АААА-А18-118020190112-8).

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Authors and Affiliations

  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Ekaterinburg, Russia

    A. G. Kuchin, S. P. Platonov, V. I. Voronin & V. S. Gaviko

  2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950, Wroclaw, Poland

    W. Iwasieczko

  3. Ural Federal University n.a. the First President of Russia B.N. Yeltsin, 620002, Ekaterinburg, Russia

    V. S. Gaviko

Authors
  1. A. G. Kuchin
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  2. S. P. Platonov
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  3. W. Iwasieczko
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  4. V. I. Voronin
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  5. V. S. Gaviko
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Correspondence to A. G. Kuchin.

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Translated by N. Kolchugina

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Kuchin, A.G., Platonov, S.P., Iwasieczko, W. et al. Effect of Chromium Substitution for Iron on the Magnetic and Structural Properties of (TmxPr1– x)2Fe17. Phys. Metals Metallogr. 120, 1137–1144 (2019). https://doi.org/10.1134/S0031918X19100065

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  • DOI: https://doi.org/10.1134/S0031918X19100065

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