New Er-Based Materials for Active Magnetic Refrigeration Below 20K

  • V. K. Pecharsky
  • K. A. GschneidnerJr.
  • C. B. Zimm
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

High magnetic field (0 to 9.85 T) low temperature (1.2 to 30 K) heat capacity of five as-cast alloys: Er3AlC, Er3AlC0.5, Er3AlC0.25, Er3AlC0.1 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 (Er3AlC) is a single phase material, while the remaining three alloys are found to be two-phase equilibrium mixtures of Er3AlC and Er2Al. Er3AlC probably orders antiferromagnetically, and ErAgGa forms a low temperature (∼3 to ∼5 K) non-magnetic atom disorder (NMAD) spin glass system. All alloys (except Er3AlC0.1) show a sufficiently high magnetocaloric effect in a range 4 to 20 K with a maximum adiabatic temperature rise of ∼12.5 K at ∼5 K for Er3AlC for magnetic field change from 0 to 7.5 T. In the carbides series, the maximum adiabatic temperature change gradually decreases from ∼12.5 K to ∼6 K and the magnetocaloric peak temperature increases from ∼5 K to ∼9 K with decreasing carbon content. The adiabatic temperature rise for the ErAgGa is ∼10% higher and covers a wider range of useful temperatures than that of the ∼50: 50 mixture of Er3AlC and Er2Al (Er3AlC0.5).

Keywords

Spin Glass Magnetocaloric Effect Magnetic Entropy Change Zero Magnetic Field Magnetic Refrigeration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • V. K. Pecharsky
    • 1
  • K. A. GschneidnerJr.
    • 1
  • C. B. Zimm
    • 2
  1. 1.Ames Laboratory and Department of Materials Science and EngineeringIowa State UniversityAmesUSA
  2. 2.Astronautics Technology CenterAstronautics Corporation of AmericaMadisonUSA

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