Magnetocaloric effects in Er[sub 1-x]Tb[sub x]Al[sub 2] alloys

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3335590· OSTI ID:976961

Khan, Mahmud; Gschneidner, K. A.; Pecharsky, V. K.

The magnetocaloric properties of the (Er{sub 1-x}Tb{sub x})Al{sub 2} alloys have been evaluated by magnetization and heat capacity measurements. It is shown that by partial substitution of Er by Tb the ferromagnetic ordering temperature of (Er{sub 1-x}Tb{sub x})Al{sub 2} can be tuned over a wide range of temperatures, that is from 13 K (ErAl{sub 2}) to 110 K (TbAl{sub 2}). Over the entire temperature range the alloy system exhibits large magnetocaloric effect. For a field change of 5 T, the observed magnetic entropy changes peaks from -18 J/kg K (x = 0.20) to -12 J/kg K (x = 0.90). The adiabatic temperature changes measured for selected alloys in the series show a maximum value of 6 K when the magnetic field is changed from 0 to 5 T.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: DE-AC02-07CH11358
• OSTI ID: 976961
• Report Number(s): IS-J 7530; JAPIAU; TRN: US201009%%138
• Journal Information: Journal of Applied Physics, Vol. 107, Issue 9; ISSN 0021-8979
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOY SYSTEMS
ALLOYS
ENTROPY
MAGNETIC FIELDS
MAGNETIZATION
SPECIFIC HEAT