TY - JOUR
T1 - Large magnetocaloric effects in NaZn13-type La(Fe xSi1-x)13 compounds and their hydrides composed of icosahedral clusters
AU - Fujieda, S.
AU - Fujita, Asaya
AU - Fukamichi, K.
N1 - Funding Information:
The present work was partly supported by a Grant-Aid for Science Research (A), No. 14702050, from the Japan Society for the Promotion of Science. One of the authors (S. Fujieda) acknowledges the support of the JSPS Research Fellowships for Young Scientists.
PY - 2003/7/1
Y1 - 2003/7/1
N2 - The magnetocaloric effects (MCEs) in cubic NaZn13-type La(FexSi1-x)13 compounds and their hydrides composed of icosahedral clusters have been investigated because these compounds exhibit the itinerant-electron metamagnetic (IEM) transition just above the Curie temperature TC. The value of TC can be increased continuously up to about 336 K by hydrogen absorption into the La(Fe xSi1-x)13 compounds. Therefore, the values of the isothermal magnetic entropy change ΔSm and the indirectly estimated adiabatic temperature change ΔTad due to the IEM transition become -31 J/kgK and 15.4 K, respectively, in the magnetic field change from 0 to 5T at TC = 287K for the La(Fe0.90Si 0.10)13H1.1 compound. The MCEs in the compounds having the IEM transition are much larger than those in the compounds exhibiting the second-order magnetic transition at TC. The direct measurement of the adiabatic temperature change ΔTad d has confirmed such a large value. Consequently, the La(Fe xSi1-x)13 compounds and their hydrides having the IEM transition are promising as high performance magnetic refrigerants working in a wide temperature range covering room temperature in relatively low magnetic fields.
AB - The magnetocaloric effects (MCEs) in cubic NaZn13-type La(FexSi1-x)13 compounds and their hydrides composed of icosahedral clusters have been investigated because these compounds exhibit the itinerant-electron metamagnetic (IEM) transition just above the Curie temperature TC. The value of TC can be increased continuously up to about 336 K by hydrogen absorption into the La(Fe xSi1-x)13 compounds. Therefore, the values of the isothermal magnetic entropy change ΔSm and the indirectly estimated adiabatic temperature change ΔTad due to the IEM transition become -31 J/kgK and 15.4 K, respectively, in the magnetic field change from 0 to 5T at TC = 287K for the La(Fe0.90Si 0.10)13H1.1 compound. The MCEs in the compounds having the IEM transition are much larger than those in the compounds exhibiting the second-order magnetic transition at TC. The direct measurement of the adiabatic temperature change ΔTad d has confirmed such a large value. Consequently, the La(Fe xSi1-x)13 compounds and their hydrides having the IEM transition are promising as high performance magnetic refrigerants working in a wide temperature range covering room temperature in relatively low magnetic fields.
KW - Hydride
KW - Icosahedral cluster
KW - Itinerant-electron metamagnetic transition
KW - La(FeSi)
KW - Magnetic refrigerants
KW - Magnetocaloric effect
KW - The Curie temperature
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U2 - 10.1016/j.stam.2003.07.002
DO - 10.1016/j.stam.2003.07.002
M3 - Article
AN - SCOPUS:0242489355
VL - 4
SP - 339
EP - 346
JO - Science and Technology of Advanced Materials
JF - Science and Technology of Advanced Materials
SN - 1468-6996
IS - 4
ER -