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Title: Magnetic properties and transformation of crystal structure in the ErFe{sub 2}-ErAl{sub 2} system

Abstract

The modification of structural properties and magnetic behaviour of the ErFe{sub 2−x}Al{sub x} Laves phase intermetallic compounds have been studied while changing the Al content in the range 0.36 ≤ x ≤ 1.5. Powder X-ray diffraction study at room temperature showed the formation of the cubic C15 structure, in the samples with Al content of 0.36 ≤ x < 0.75 and 1.4 ≤ x ≤ 2.0. For the intermediate compositions with 0.75 ≤ x ≤ 1.4, the hexagonal C14 structure is observed. Magnetic and magnetocaloric properties of polycrystalline ErFe{sub 2−x}Al{sub x} intermetallic compounds were investigated experimentally using magnetic and heat capacity measurements. The Curie temperature T{sub C} decreases from 275 to 28 K as the Al content increases from x = 0.36 to x = 1.5, respectively. Magnetization measurements in strong magnetic fields showed the complex mechanism of magnetic saturation in the studied compounds. Under an external field change from 0 to 2 T, the maximum entropy change is 6 J/kg K at T = 28 K for the composition with x = 1.5. The minimum in the concentration dependence of the magnetic entropy change is observed in the vicinity of x equal to 1.25. Regularities of variations of magnetocaloric properties of ErFe{sub 2−x}Al{sub x} intermetallic compounds with increasing Al content are discussed from the point of view of their both structural and magnetic states.

Authors:
 [1];  [1]; ;  [2];  [1];  [3]
  1. International Laboratory of High Magnetic Fields and Low Temperatures, PAS, Wroclaw, Poland, 53-421 (Poland)
  2. Baikov Institute of Metallurgy and Materials Science, RAS, Moscow, Russia, 119991 (Russian Federation)
  3. Institute of Low Temperature and Structure Research, PAS, Wroclaw, Poland, 50-422 (Poland)
Publication Date:
OSTI Identifier:
22399339
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM; CONCENTRATION RATIO; CRYSTAL STRUCTURE; CURIE POINT; ENTROPY; ERBIUM; INTERMETALLIC COMPOUNDS; IRON; LAVES PHASES; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETIZATION; POLYCRYSTALS; POWDERS; SPECIFIC HEAT; TEMPERATURE RANGE 0273-0400 K; X-RAY DIFFRACTION

Citation Formats

Ćwik, J., E-mail: cwikjac@ml.pan.wroc.pl, Miller, M., Koshkid'ko, Y., VSB-Technical University of Ostrava, Ostrava-Poruba, Czech Republic, 708 33, Mikhailova, A., Kolchugina, N., Nenkov, K., IFW Dresden, Institute of Metallic Materials, Dresden, Germany, D-01171, and Hackamer, A. Magnetic properties and transformation of crystal structure in the ErFe{sub 2}-ErAl{sub 2} system. United States: N. p., 2015. Web. doi:10.1063/1.4916353.
Ćwik, J., E-mail: cwikjac@ml.pan.wroc.pl, Miller, M., Koshkid'ko, Y., VSB-Technical University of Ostrava, Ostrava-Poruba, Czech Republic, 708 33, Mikhailova, A., Kolchugina, N., Nenkov, K., IFW Dresden, Institute of Metallic Materials, Dresden, Germany, D-01171, & Hackamer, A. Magnetic properties and transformation of crystal structure in the ErFe{sub 2}-ErAl{sub 2} system. United States. https://doi.org/10.1063/1.4916353
Ćwik, J., E-mail: cwikjac@ml.pan.wroc.pl, Miller, M., Koshkid'ko, Y., VSB-Technical University of Ostrava, Ostrava-Poruba, Czech Republic, 708 33, Mikhailova, A., Kolchugina, N., Nenkov, K., IFW Dresden, Institute of Metallic Materials, Dresden, Germany, D-01171, and Hackamer, A. 2015. "Magnetic properties and transformation of crystal structure in the ErFe{sub 2}-ErAl{sub 2} system". United States. https://doi.org/10.1063/1.4916353.
@article{osti_22399339,
title = {Magnetic properties and transformation of crystal structure in the ErFe{sub 2}-ErAl{sub 2} system},
author = {Ćwik, J., E-mail: cwikjac@ml.pan.wroc.pl and Miller, M. and Koshkid'ko, Y. and VSB-Technical University of Ostrava, Ostrava-Poruba, Czech Republic, 708 33 and Mikhailova, A. and Kolchugina, N. and Nenkov, K. and IFW Dresden, Institute of Metallic Materials, Dresden, Germany, D-01171 and Hackamer, A.},
abstractNote = {The modification of structural properties and magnetic behaviour of the ErFe{sub 2−x}Al{sub x} Laves phase intermetallic compounds have been studied while changing the Al content in the range 0.36 ≤ x ≤ 1.5. Powder X-ray diffraction study at room temperature showed the formation of the cubic C15 structure, in the samples with Al content of 0.36 ≤ x < 0.75 and 1.4 ≤ x ≤ 2.0. For the intermediate compositions with 0.75 ≤ x ≤ 1.4, the hexagonal C14 structure is observed. Magnetic and magnetocaloric properties of polycrystalline ErFe{sub 2−x}Al{sub x} intermetallic compounds were investigated experimentally using magnetic and heat capacity measurements. The Curie temperature T{sub C} decreases from 275 to 28 K as the Al content increases from x = 0.36 to x = 1.5, respectively. Magnetization measurements in strong magnetic fields showed the complex mechanism of magnetic saturation in the studied compounds. Under an external field change from 0 to 2 T, the maximum entropy change is 6 J/kg K at T = 28 K for the composition with x = 1.5. The minimum in the concentration dependence of the magnetic entropy change is observed in the vicinity of x equal to 1.25. Regularities of variations of magnetocaloric properties of ErFe{sub 2−x}Al{sub x} intermetallic compounds with increasing Al content are discussed from the point of view of their both structural and magnetic states.},
doi = {10.1063/1.4916353},
url = {https://www.osti.gov/biblio/22399339}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 12,
volume = 117,
place = {United States},
year = {Sat Mar 28 00:00:00 EDT 2015},
month = {Sat Mar 28 00:00:00 EDT 2015}
}