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Effects of Cr substitution on structural and magnetic properties in La0.7Pr0.3Fe11.4Si1.6 compound
Australian Institute for Innovative Materials - Papers
  • M F Md Din, University of Wollongong
  • Jianli Wang, University of Wollongong
  • Andrew J Studer, Australian Nuclear Science And Technology Organisation
  • Qinfen Gu, Australian Synchrotron Company
  • R Zeng, Universty of Western Sydney
  • J C Debnath, University of Wollongong, University of Johannesburg
  • Precious Shamba, University of Wollongong
  • Shane Kennedy, ANSTO, Bragg Institute, Ansto
  • S X Dou, University of Wollongong
RIS ID
89121
Publication Date
1-1-2014
Publication Details
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.
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.
Citation Information
M F Md Din, Jianli Wang, Andrew J Studer, Qinfen Gu, et al.. "Effects of Cr substitution on structural and magnetic properties in La0.7Pr0.3Fe11.4Si1.6 compound" (2014)
Available at: http://works.bepress.com/sxdou/585/