Journal of Thermal Analysis and Calorimetry

, Volume 111, Issue 2, pp 1251–1254 | Cite as

Theoretical work on magnetocaloric effect in ceramic and sol–gel La0.67Ca0.33MnO3

  • Mahmoud Aly Hamad


In this study, a theoretical work on magnetocaloric properties of ceramic and sol–gel La0.67Ca0.33MnO3 samples was presented. The value of the magnetocaloric effect has been determined from theoretical work on magnetization as a function of temperature. It is showed that ceramic sample shows better magnetocaloric properties than the sol–gel one. Though the maximum magnetic entropy change ∆S M of ceramic sample upon 5 kOe applied field variation which is about 76 % of that of a pure Gd metal upon 5 kOe, ∆S M distribution of the La0.67Ca0.33MnO3 is much more uniform than that of Gd. This feature is desirable for an Ericson-cycle magnetic refrigerator.


Magnetocaloric effect Model Magnetization Magnetic entropy change Heat capacity change Relative cooling power 


  1. 1.
    Oliveira NA, Ranke PJ. Theoretical aspects of the magnetocaloric effect. Phys Rep. 2010;489:89.CrossRefGoogle Scholar
  2. 2.
    Gschneidner KA, Pecharsky VK, Tsoko AO. Recent developments in magnetocaloric materials. Rep Prog Phys. 2005;68:1479.CrossRefGoogle Scholar
  3. 3.
    Hamad MA. Magnetocaloric effect in polycrystalline Gd1-xCaxBaCo2O5.5. Mater Lett. 2012. doi: 10.1016/j.matlet.2012.05.088.
  4. 4.
    Hamad MA. Calculation on electrocaloric properties of ferroelectric SrBi2Ta2O9. Phase Transition. 2012;85:159–68.CrossRefGoogle Scholar
  5. 5.
    Mischenko AS, Zhang Q, Scott JF, Whatmore RW, Marhur ND. Giant electrocaloric effect in thin-film PbZr0. 95Ti0. 05O3. Science. 2006;311:1270.CrossRefGoogle Scholar
  6. 6.
    Hamad MA. Investigations on electrocaloric properties of [111]-oriented 0.955PbZn1/3Nb2/3O3–0.045PbTiO3 single crystals. Phase Transitions. 2012. doi: 10.1080/01411594.2012.674527.Google Scholar
  7. 7.
    Hamad MA. Detecting giant electrocaloric effect in SrxBa1−xNb2O6 single crystals. Appl Phys Lett. 2012;100:192908.CrossRefGoogle Scholar
  8. 8.
    Tocado L, Palacios E, Burriel R. Adiabatic measurement of the giant magnetocaloric effect in MnAs. J Therm Anal Calorim. 2006;84:213–7.CrossRefGoogle Scholar
  9. 9.
    Zimm C, Jastrab A, Sternberg A, Pecharsky VK, Gschneidner KA, Osborne M, Anderson I. Description and performance of a near-room temperature magnetic refrigerator. Adv Cryog Eng. 1998;43:1759.Google Scholar
  10. 10.
    Hamad MA. Prediction of energy loss of Ni0.58Zn0.42Fe2O4 nanocrystalline and Fe3O4 nanowire arrays. Jpn J Appl Phys. 2010;49:085004.CrossRefGoogle Scholar
  11. 11.
    Manoharan SS, Kumar D, Hegde MS, Satyalakshmi KM, Prasad V, Subramanyam SV. Giant magnetoresistance in self-doped La1−xMnO3−δ thin films. J Solid State Chem. 1995;117:420.CrossRefGoogle Scholar
  12. 12.
    Banerjee S, Kumar A, Devi PS. Preparation of nanoparticles of oxides by the citrate–nitrate process. J Therm Anal Calorim. 2011;104:859–67.CrossRefGoogle Scholar
  13. 13.
    Hamad MA. Prediction of thermomagnetic properties of La0.67Ca0.33MnO3 and La0.67Sr0.33MnO3. Phase Transition. 2012;85:106–12.CrossRefGoogle Scholar
  14. 14.
    Phan MH, Yu SC. Review of the magnetocaloric effect in manganite materials. J Magn Magn Mater. 2007;308:325–40.CrossRefGoogle Scholar
  15. 15.
    Jacob KT, Attaluri M. Refinement of thermodynamic data for LaMnO3. J Mater Chem. 2003;13:934–42.CrossRefGoogle Scholar
  16. 16.
    Gupta A, McGuire TR, Duncombe PR, Rupp M, Sun JZ, Gallagher WJ, Xiao G. Growth and giant magnetoresistance properties of La-deficient LaMnO (0.67 ≤ x ≤ 1) films. Appl Phys Lett. 1995;67:3494.CrossRefGoogle Scholar
  17. 17.
    Dan’kov SY, Tishin AM, Pecharsky VK, Gschneidner KA. Magnetic phase transitions and the magnetothermal properties of gadolinium. Phys Rev B. 1998;57:3478.CrossRefGoogle Scholar
  18. 18.
    Pecharsky VK, Gschneidner KA. Magnetocaloric effect and magnetic refrigeration. J Magn Magn Mater. 1999;200:44.CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  1. 1.Physics Department, College of ScienceAl-Jouf UniversitySkakaSaudi Arabia

Personalised recommendations