New Er-based materials for active magnetic refrigeration below 20K
- Ames Lab., IA (United States)
- Astronautics Corp. of America, Madison, WI (United States)
High magnetic field (0 to 9.85 T) low temperature (1.2 to 30 K) heat capacity of five as-cast alloys: Er{sub 3}AlC, Er{sub 3}AlC{sub 0.5}, Er{sub 3}AlC{sub 0.25}, Er{sub 3}AlC{sub 0.1} and ErAgGa revealed that four of them can be used as efficient active magnetic regenerators for magnetic refrigerators at low temperature. Only one of the carbide phases (Er{sub 3}AlC) is a single phase material, while the remaining three alloys are found to be two-phase equilibrium mixtures of Er{sub 3}AlC and Er{sub 2}Al. Er{sub 3}AlC probably orders antiferromagnetically, and ErAgGa forms a low temperature ({approximately}3 to {approximately}5 K) non-magnetic atom disorder (NMAD) spin glass system. All alloys (except Er{sub 3}AlC{sub 0.1}) show a sufficiently high magnetocaloric effect in a range 4 to 20 K with a maximum adiabatic temperature rise of {approximately}12.5 K at {approximately}5 K for Er{sub 3}AlC for magnetic field change from 0 to 7.5 T. In the carbides series, the maximum adiabatic temperature change gradually decreases from {approximately}12.5 K to {approximately}6 K and the magnetocaloric peak temperature increases from {approximately}5 K to {approximately}9 K with decreasing carbon content. The adiabatic temperature rise for the ErAgGa is {approximately}10% higher and covers a wider range of useful temperatures than that of the {approximately}50:50 mixture of Er{sub 3}AlC and Er{sub 2}Al (Er{sub 3}AlC{sub 0.5}).
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 476735
- Report Number(s):
- CONF-950722-; ISSN 0065-2482; TRN: 97:009227
- Journal Information:
- Advances in Cryogenic Engineering, Vol. 42A; Conference: CEC/ICMC `95: cryogenic engineering conference and international cryogenic materials conference, Columbus, OH (United States), 17-21 Jul 1995; Other Information: PBD: 1997
- Country of Publication:
- United States
- Language:
- English
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