The Influence of Multiple Magnetic Ordering on the Magnetocaloric Effect in RNiAl Alloys

  • B. J. Korte
  • V. K. Pecharsky
  • K. A. GschneidnerJr.
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)


Both the change in magnetic entropy (ΔSmag) and the adiabatic temperature rise (ΔTad) induced by a change of magnetic field were determined for a series of (Gd1-xErx)NiAl alloys (where x = 0, 0.30, 0.46, 0.60, 0.80 and 1.00). Through magnetic and heat capacity measurements, these materials were found to possess multiple antiferromagnetic and ferromagnetic ordering processes. The value of ΔSmag was observed to peak around the antiferromagnetic transition temperature for ErNiAl, with the maximum gradually broadening and shifting upward toward the Curie temperature as the Gd content is increased. For Gd-rich alloys, a significant contribution to the magnetic entropy change is observed at both the low and high-temperature transitions, resulting in a skewed caret-like ΔSmag vs. temperature profile. Broad zero-field transitions coupled with opposing shifts in entropy around the ferromagnetic and antiferromagnetic ordering temperatures induced by the application of a magnetic field are believed to contribute to this effect.


Magnetocaloric Effect Magnetic Entropy Change Heat Capacity Measurement Refrigeration Cycle Magnetic Refrigeration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    C.R. Cross, J. A. Barclay, A. J. DeGregoria, S. R. Jaeger and J. W. Johnson, “Optimal temperature-entropy curves for magnetic refrigeration”, Adv. Cryog. Eng. 33:767 (1988).CrossRefGoogle Scholar
  2. 2.
    T. Hashimoto, T. Kuzuhura, M. Sahashi, K. Inomata, A. Tomokiyo and H. Yayama, “New application of complex magnetic materials to the magnetic refrigerant in an Ericsson magnetic refrigerator”, J. Appl. Phys. 62:3873 (1987).CrossRefGoogle Scholar
  3. 3.
    A. Smaïli and R. Chahine, “Composite magnetic refrigerants for an Ericsson cycle: New method of selection using a numerical approach”, Adv Cryog Eng. 42:445 (1996).Google Scholar
  4. 4.
    A. Smaïli and R. Chahine, “Composite materials for Ericsson-like magnetic refrigeration cycle”, J. Appl. Phys 81:824 (1997).CrossRefGoogle Scholar
  5. 5.
    H. Takeya, V. K. Pecharsky, K. A. Gschneidner Jr. and J. O. Moorman, “New type of magnetocaloric effect: Implications on low-temperature magnetic refrigeration using an Ericsson cycle”, Appl. Phys. Lett. 64:2739 (1994).CrossRefGoogle Scholar
  6. 6.
    H. Oesterreicher, “Structural and magnetic studies on rare-earth compounds RNiAl and RCuAl”, J. Less-Common Metals 30:225 (1973).CrossRefGoogle Scholar
  7. 7.
    V. K. Pecharsky, K. A. Gschneidner, Jr. and J. O. Moorman, “A 3 to 350 K automatic small sample calorimeter”, Rev. Sci Instr., to be published Nov 1997 issue.Google Scholar
  8. 8.
    P. Javorsky, P. Burlet, E. Ressouche, V. Sechovsky, H. Michor and G. Lapertot, “Magnetic structure study of ErCuAl and ErNiAl”, Physica B 225:210 (1996).CrossRefGoogle Scholar
  9. 9.
    C. E. Reid, J. A. Barclay, J. L. Hall and S. Sarangi, “Selection of magnetic materials for an active magnetic regenerative refrigerator”, J. Alloys Compds 207/208:366 (1994).CrossRefGoogle Scholar
  10. 10.
    G. Ehlers and H. Maletta, “Spin structures with frustrated moments in RNiAl intermetallic compounds”, Z Phys. B 101:317 (1996).CrossRefGoogle Scholar
  11. 11.
    K. A Gschneidner Jr, V. K. Pecharsky, and S. K. Malik, “The (Dy1-xErx)Al2 alloys as active magnetic regenerators for magnetic refrigeration”, Adv. Cryog. Eng. 42:475 (1996).Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • B. J. Korte
    • 1
  • V. K. Pecharsky
    • 1
  • K. A. GschneidnerJr.
    • 1
    • 2
  1. 1.Ames LaboratoryIowa State UniversityAmesUSA
  2. 2.Department of Materials Science and EngineeringIowa State UniversityAmesUSA

Personalised recommendations