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

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] ; ;  [3] ;  [1] ;  [4] ;  [5]
  1. International Laboratory of High Magnetic Fields and Low Temperatures, PAS, Wroclaw, Poland, 53-421 (Poland)
  2. (Czech Republic)
  3. Baikov Institute of Metallurgy and Materials Science, RAS, Moscow, Russia, 119991 (Russian Federation)
  4. (Germany)
  5. Institute of Low Temperature and Structure Research, PAS, Wroclaw, Poland, 50-422 (Poland)
Publication Date:
OSTI Identifier:
22399339
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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