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Title: Effects of Cr substitution on structural and magnetic properties in La{sub 0.7}Pr{sub 0.3}Fe{sub 11.4}Si{sub 1.6} compound

In an effort to explore the effect of substitution Fe by Cr in NaZn{sub 13}-type La{sub 0.7}Pr{sub 0.3}Fe{sub 11.4−x}Cr{sub x}Si{sub 1.6} (x = 0, 0.06, 0.12, 0.26, and 0.34) compounds, the structure and magnetic properties have been investigated by high intensity of x-ray and neutron diffraction, scanning electron microscopy, specific heat, and magnetization measurement. It has been found that a substitution of Cr for Fe in this compounds leads to decrease in the lattice parameter a at room temperature but variation on Curie temperature (T{sub C}). While the first order nature of magnetic phase transition around T{sub C} does not change with increasing Cr content up to x = 0.34. High intensity x-ray and neutron diffraction study at variable temperatures for highest Cr concentration x = 0.34 confirmed the presence of strong magneto-volume effect around T{sub C} and indicated the direct evident of coexistence across magnetic transition as characteristic of first order nature. The values of −ΔS{sub M} around T{sub C} decrease from 17 J kg{sup −1} K{sup −1} for x = 0 to 12 J kg{sup −1} K{sup −1} for x = 0.06 and then increases with further increasing Cr content up to 17.5 J kg{sup −1} K{sup −1} for x = 0.34 under a change of 0–5 T magnetic field. Similar behavior on relative cooling power which is decrease frommore » 390 J kg{sup −1} for x = 0 to 365 J kg{sup −1} for x = 0.06 at the beginning and then increases up to 400 J kg{sup −1} for x = 0.34. From the point of this view with the highest Cr concentration (x = 0.34) exhibits favourable material candidate for magnetic refrigerator application therefore should inspire further study concerning on higher Cr concentration in this compound.« less
Authors:
 [1] ;  [2] ;  [1] ;  [3] ; ;  [4] ;  [5] ; ; ; ;  [1]
  1. Institute for Superconductivity and Electronic Materials, University of Wollongong, Wollongong, NSW 2522 (Australia)
  2. (Malaysia)
  3. (Australia)
  4. Bragg Institute, ANSTO, Lucas Heights, NSW 2234 (Australia)
  5. Australian Synchrotron, 800 Blackburn Rd, Clayton 3168 (Australia)
Publication Date:
OSTI Identifier:
22273680
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONCENTRATION RATIO; CURIE POINT; IRON SILICIDES; LANTHANUM COMPOUNDS; LATTICE PARAMETERS; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETIC REFRIGERATORS; MAGNETIZATION; NEUTRON DIFFRACTION; PHASE TRANSFORMATIONS; PRASEODYMIUM COMPOUNDS; SCANNING ELECTRON MICROSCOPY; SPECIFIC HEAT; TEMPERATURE RANGE 0273-0400 K; X-RAY DIFFRACTION