Demonstrative Experiments on the Magnetocaloric Effect of Gadolinium

가돌리늄의 자기열량효과에 대한 실증실험

  • 이종석 (강릉대학교 정밀기계공학과)
  • Published : 2004.04.01

Abstract

Magnetic refrigeration is based on the magnetocaloric effect (MCE) - the ability of some materials to heat up when magnetized and cool down when removed from the magnetic field. The available techniques for studying the MCE we: (1) direct measurements by monitoring the change in the material's temperature during the application or removal of the magnetic field; and (2) indirect calculations from the experimental data of magnetization and/or specific heat as a function of the temperature and magnetic field. The MCE of gadolinium (Gd) has been demonstrated by direct measurements of temperature change, and isothermal magnetic entropy changes and adiabatic temperature changes have been calculated.

Keywords

References

  1. Proceedings of the SAREK 2000 Summer Annual Conference(Ⅲ) Principle of magnetic refrigeration and recent development Lee,J.S.
  2. Adv. Cryo. Eng. v.43 Description and performance of a near-room temperature magnetic refrigerator Zimm,C.A.;Jastrab,A.;Stemberg,A.;Pecharsky,V.K.;Gschneidner,K.A.Jr.;Osborne,M.G.;Anderson,I.E.
  3. Phys. Rev. Lett. v.78 no.23 Giant magnetocaloric effect in $Gd_5$(Si₂Ge₂) Pecharsky,V.K.;Gschneidner,K.A.Jr https://doi.org/10.1103/PhysRevLett.78.4494
  4. Appl. Phys. Lett. v.70 no.24 Tunable magnetic regernerator alloys with a giant magnetocaloric effect for magnetic refrigeration from ~20K to ~290K Percharsky,V.K.;Gschnerdner,K.A.Jr. https://doi.org/10.1063/1.119206
  5. Appl. Phys. Lett. v.79 no.20 Giant magnetocaloric effect of Mn$As_{1-x}Sb_x$ Wada,H.;Tanabe,Y. https://doi.org/10.1063/1.1419048
  6. Applied Physics Letters v.81 no.7 Large magnetocaloric effect in La$(Fe_{x}Si_{1-x})_13$ itinerant-electron metamagnetic compounds Fujida,S.;Fujita,A.;Frkamuchi,K. https://doi.org/10.1063/1.1498148
  7. Applied Physics Letters v.81 no.18 Magnetocaloric effect in layered perovskite manganese oxide $La_{1.4}Ca_{1.6}Mn_{2}O-{7}$ Zhu,H.;Song,H.;Zhang,Y. https://doi.org/10.1063/1.1518160
  8. Physical Review B v.57 Magnetic phase transitions and the magnetothermal properties of gadolinium Dan'kov,S.Yu,;Tishin,A.M.;Pecharsky,V.K.;Gschnerdner,K.A.Jr. https://doi.org/10.1103/PhysRevB.57.3478
  9. Advances in cryogenic Engineering v.42 Comparison of the magnetocaloric effect derived from heat capacity, direct, and magnetization measurements Pecharsky,V.K.;Gschnerdner,K.A.Jr.
  10. Proceedings of the SAREK 2002 Winter Annual Conference Methods for evaluating magnetocaloric effects and thermodynamic relations Lee,J.S.
  11. Journal of Applied Physics v.86 Magnetocaloric effect from inderect measurements: magnetization and heat capacity Pecharsky,V.K.;Gschnerdner,K.A.Jr. https://doi.org/10.1063/1.370767