Mean-Field Approximation Analysis of Magnetocaloric Effect in Rare-Earth Materials

  • A. M. Tishin
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)

Abstract

This paper describes the results of a computer simulation analysis of the magnetocaloric effect (MCE) in rare earth metals and rare earth based materials. The analysis was previously developed for calculating peak values of the MCE in rare earth magnets using a mean-field approximation. This study concentrates on the variation of the key thermodynamic parameters such as magnetic field, temperature, Curie and Debye temperatures of the magnets in wide range of their values. The results of theoretical studies of the MCE in large magnetic fields are described. The possible mechanisms of magnetic entropy change in a paraprocess region are discussed. The study shows strong influence of the Debye temperature of the magnets on the MCE value in the wide temperature region (from 4.2 K to 200–230 K).

Keywords

High Magnetic Field Debye Temperature Magnetocaloric Effect Magnetic Entropy Change 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.

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References

  1. 1.
    K.A. Gschneidner, Jr., and V.K. Pecharsky, “Magnetic Refrigeration”, in: “Rare Earths Science, Technology & Applications III”, R.G. Bautista, CO. Bounds, T.W. Ellis, and B.T. Kilbourn, Eds., TMS, Warrendale, PA (1997), 209.Google Scholar
  2. 2.
    M.D. Kuz’min and A.M. Tishin, Magnetocaloric effect. Part 1: An introduction to various aspects of theory and practice, Cryogenics. 32:545 (1992). Part 2 : Magnetocaloric effect in heavy rare earth metals and their alloys and application to magnetic refrigeration, Cryogenics. 33:868 (1993).CrossRefGoogle Scholar
  3. 3.
    A.M. Tishin, Magnetocaloric effect in lanthanide materials. Invited paper submitted to the 21st Rare Earth Research Conference, July 7–12, 1996, Duluth, Minnesota (to be published in J. Alloys Comp.), v.250 (1997).Google Scholar
  4. 4.
    A.M. Tishin, Magnetocaloric effect in high magnetic field, Cryogenics 30:127 (1990).CrossRefGoogle Scholar
  5. 5.
    A.M. Tishin, Dr. Sci. Thesis, Moscow State University, Moscow, Russia, 1994.Google Scholar
  6. 6.
    K.A. Gschneider, Jr., H. Takeya, JO. Moorman, V.K. Pecharsky, S.K. Malik, and C.B. Zimm, New magnetic refrigeration materials for the liquefaction of hydrogen, Adv. Cryo. Eng. 39:1457 (1994).CrossRefGoogle Scholar
  7. 7.
    B.K. Ponomarev, Magnetic properties of gadolinium in the region of paraprocess, J.Magn. Magn. Mater. 61:1291 (1986).CrossRefGoogle Scholar
  8. 8.
    K.A. Gschneidner, Jr. and V.K Pecharsky, Unpublished result.Google Scholar
  9. 9.
    C.B. Zimm, J.A. Barclay, H.H. Harkness, G.F. Green, and W.G. Patton, Magnetocaloric effect in thulium, Cryogenics. 29:937 (1989)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • A. M. Tishin
    • 1
  1. 1.Faculty of Physics, M.V.Lomonosov MoscowState UniversityMoscowRussia

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