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Effects of Cr substitution on structural and magnetic properties in La0.7Pr0.3Fe11.4Si1.6 compound

Journal Article


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Abstract


  • In an effort to explore the effect of substitution Fe by Cr in NaZn13-type La0.7Pr0.3Fe11.4−xCrxSi1.6 (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 (TC). While the first order nature of magnetic phase transition around TC 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 TC and indicated the direct evident of coexistence across magnetic transition as characteristic of first order nature. The values of −ΔSM around TC decrease from 17 J kg−1 K−1 for x = 0 to 12 J kg−1 K−1 for x = 0.06 and then increases with further increasing Cr content up to 17.5 J kg−1 K−1 for x = 0.34 under a change of 0–5 T magnetic field. Similar behavior on relative cooling power which is decrease from 390 J kg−1 for x = 0 to 365 J kg−1 for x = 0.06 at the beginning and then increases up to 400 J kg−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.

Authors


  •   Md Din, M F. (external author)
  •   Wang, Jian Li.
  •   Studer, Andrew J. (external author)
  •   Gu, Qinfen (external author)
  •   Zeng, R (external author)
  •   Debnath, J C. (external author)
  •   Shamba, Precious (external author)
  •   Kennedy, Shane J. (external author)
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Md Din, M. F., Wang, J. L., Studer, A. J., Gu, Q. F., Zeng, R., Debnath, J. C., Shamba, P., Kennedy, S. J. & Dou, S. X. (2014). Effects of Cr substitution on structural and magnetic properties in La0.7Pr0.3Fe11.4Si1.6 compound. Journal of Applied Physics, 115 (17), 17A942-1-17A942-3.

Scopus Eid


  • 2-s2.0-84903886630

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2214&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1213

Start Page


  • 17A942-1

End Page


  • 17A942-3

Volume


  • 115

Issue


  • 17

Abstract


  • In an effort to explore the effect of substitution Fe by Cr in NaZn13-type La0.7Pr0.3Fe11.4−xCrxSi1.6 (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 (TC). While the first order nature of magnetic phase transition around TC 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 TC and indicated the direct evident of coexistence across magnetic transition as characteristic of first order nature. The values of −ΔSM around TC decrease from 17 J kg−1 K−1 for x = 0 to 12 J kg−1 K−1 for x = 0.06 and then increases with further increasing Cr content up to 17.5 J kg−1 K−1 for x = 0.34 under a change of 0–5 T magnetic field. Similar behavior on relative cooling power which is decrease from 390 J kg−1 for x = 0 to 365 J kg−1 for x = 0.06 at the beginning and then increases up to 400 J kg−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.

Authors


  •   Md Din, M F. (external author)
  •   Wang, Jian Li.
  •   Studer, Andrew J. (external author)
  •   Gu, Qinfen (external author)
  •   Zeng, R (external author)
  •   Debnath, J C. (external author)
  •   Shamba, Precious (external author)
  •   Kennedy, Shane J. (external author)
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Md Din, M. F., Wang, J. L., Studer, A. J., Gu, Q. F., Zeng, R., Debnath, J. C., Shamba, P., Kennedy, S. J. & Dou, S. X. (2014). Effects of Cr substitution on structural and magnetic properties in La0.7Pr0.3Fe11.4Si1.6 compound. Journal of Applied Physics, 115 (17), 17A942-1-17A942-3.

Scopus Eid


  • 2-s2.0-84903886630

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2214&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1213

Start Page


  • 17A942-1

End Page


  • 17A942-3

Volume


  • 115

Issue


  • 17