Journal Home > Volume 1 , issue 4

In this work, a phenomenological model is applied to describe the magnetocaloric effect for the La0.75Ca0.25MnO3 system near a second-order phase transition from a ferromagnetic to a paramagnetic state. Based on this model, it can predict the values of the magnetocaloric properties from calculation of magnetization as a function of temperature under different external magnetic fields. The magnetic entropy change reaches a peak of about 5.39 J/(kg·K) at 257 K upon 4 T applied field variation. The ∆SM distribution is much more uniform than that of gadolinium, which is desirable for an Ericson-cycle magnetic refrigerator.


menu
Abstract
Full text
Outline
About this article

Theoretical work on magnetocaloric effect in La0.75Ca0.25MnO3

Show Author's information Mahmoud Aly HAMAD*( )
Physics Department, College of Science, Al-Jouf University, Al-Jouf, Skaka, P.O. Box 2014, Saudi Arabia

Abstract

In this work, a phenomenological model is applied to describe the magnetocaloric effect for the La0.75Ca0.25MnO3 system near a second-order phase transition from a ferromagnetic to a paramagnetic state. Based on this model, it can predict the values of the magnetocaloric properties from calculation of magnetization as a function of temperature under different external magnetic fields. The magnetic entropy change reaches a peak of about 5.39 J/(kg·K) at 257 K upon 4 T applied field variation. The ∆SM distribution is much more uniform than that of gadolinium, which is desirable for an Ericson-cycle magnetic refrigerator.

Keywords:

magnetocaloric effect, model, magnetic entropy change, heat capacity change, relative cooling power
Received: 26 September 2012 Revised: 10 November 2012 Accepted: 12 November 2012 Published: 09 January 2013 Issue date: December 2012
References(30)
[1]
de Oliveira A, von Ranke PJ. Theoretical aspects of themagnetocaloric effect. Phys Reports 2010, 489:89.
[2]
Gschneidner KA, Pecharsky VK, Tsoko AO. Recent developments in magnetocaloric materials. Rep Prog Phys 2005, 68:1479.
[3]
Hamad MA. Detecting giant electrocaloric effect in SrxBa1-xNb2O6 single crystals. Appl Phys Let 2012, 100:192908.
[4]
Hamad MA. Magnetocaloric effect in polycrystalline Gd1-xCaxBaCo2O5.5. Mater Lett 2012, 82:181-183.
[5]
Hamad MA. Investigations on electrocaloric properties of [111] oriented 0.955PbZn1/3Nb2/3O3-0.045PbTiO3 single crystals. Phase Transition 2012, .
[6]
Hamad MA. Magnetocaloric effect in Ge0.95Mn0.05 films. J Supercond Nov Magn 2012, .
[7]
Hamad MA. Theoretical investigations on electrocaloric properties of relaxor ferroelectric 0.9PbMg1/3Nb2/3O3-0.1PbTiO3 thin film. J Comput Electron 2012, 11:344-348
[8]
Hamad MA. Calculation of electrocaloric properties of ferroelectric SrBi2Ta2O9. Phase Transition 2012, 85:159-168.
[9]
Hamad MA. Theoretical work on magnetocaloric effect in ceramic and sol-gel La0.67Ca0.33MnO3. J Therm Anal Calorim 2012, .
[10]
Debnath JC, Zeng R, Kim JH, et al. Improvement of refrigerant capacity of La0.7Ca0.3MnO3 material with a few percent Co doping. J Magn Magn Mater 2011, 323:138-143.
[11]
Hamad MA. Magnetocaloric properties of La0.6Ca0.4MnO3. J Therm Anal Calorim 2012, .
[12]
Baldini M, Capogna L, Capone M, et al. Pressure induced magnetic phase separation in La0.75Ca0.25MnO3 manganite. J Phys: Condens Matter 2012, 24: 045601.
[13]
Schiffer P, Ramirez AP, Bao W, et al. Low temperature magnetoresistance and the magnetic phase diagram of La1-xCaxMnO3. Phys Rev Lett 1995, 75:3336-3339.
[14]
Hamad MA. Prediction of energy loss of Ni0.58Zn0.42Fe2O4 nanocrystalline and Fe3O4 nanowire arrays. Jpn J Appl Phys 2010, 49:085004.
[15]
Hamad MA. Calculations on nanocrystalline CoFe2O4 prepared by polymeric precursor method. J Supercond Nov Magn 2012, .
[16]
Hamad MA. Prediction of thermomagnetic properties of La0.67Ca0.33MnO3 and La0.67Sr0.33MnO3. Phase Transitions 2012, 85:106-112.
[17]
Phan MH, SC Yu. Review of the magnetocaloric effect in manganite materials. J Magn Magn Mater 2007, 308:325.
[18]
Földeaki M, Chahine R, Bose TK. Magnetic measurements: A powerful tool in magnetic refrigerator design. J Appl Phys 1995, 77:3528-3537.
[19]
Terashita H, Garbe JJ, Neumeier JJ. Compositional dependence of the magnetocaloric effect in La1−xCaxMnO3 (0 ≤ x ≤ 0.52). Phys Rev B 2004, 70:094403.
[20]
Williams DV. Characterization of the structural and magnetic properties of Gd thin films. Ph.D. Thesis. Florida (USA): University of South Florida, 2010.
[21]
Goodenough JB. Theory of the role of covalence in the perovskite-type manganites [La, M(II)]MnO3. Phys Rev 1955, 100:564.
[22]
Dan'kov SY, Tishin AM, Pecharsky VK, et al. Magnetic phase transitions and the magnetothermal properties of gadolinium. Phys Rev B 1998, 57:3478-3490.
[23]
Pecharsky VK, Gschneidner KA. Magnetocaloric effect and magnetic refrigeration. J Magn Magn Mater 1999, 200:44-56.
[24]
Bohigas X, Tejada J, del Barco E, et al. Tunable magnetocaloric effect in ceramic perovskites. Appl Phys Lett 1998, 73:390.
[25]
Guo ZB, Du YW, Zhu JS, et al. Large magnetic entropy change in perovskite-type manganese oxides. Appl Phys Lett 1997, 78:1142-1145.
[26]
Radaelli PG, Cox DE, Marezio M, et al. Simultaneous structural, magnetic, and electronic transitions in La1-xCaxMnO3 with x=0.25 and 0.50. Phys Rev Lett 1995, 75:4488-4491.
[27]
Kim KH, Gu JY, Choi HS, et al. Frequency shifts of the internal phonon modes in La0.7Ca0.3MnO3. Phys Rev Lett 1996, 77:1877-1880.
[28]
Tang T, Gu KM, Cao QQ, et al. Magnetocaloric properties of Ag-substituted perovskite-type manganites. J Magn Magn Mater 2000, 222:110-114.
[29]
Phan MH, Tian SB, Yu SC, et al. Magnetic and magnetocaloric properties of La0.7Ca0.3-xBaxMnO3 compounds. J Magn Magn Mater 2003, 256:306-310.
[30]
Sun Y, Tong W, Zhang YH. Large magnetic entropy change above 300 K in La0.67Sr0.33Mn0.9Cr0.1O3. J Magn Magn Mater 2001, 232:205-208.
Publication history
Copyright
Rights and permissions

Publication history

Received: 26 September 2012
Revised: 10 November 2012
Accepted: 12 November 2012
Published: 09 January 2013
Issue date: December 2012

Copyright

© The author(s) 2012

Rights and permissions

Reprints and Permission requests may be sought directly from editorial office.

Return