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STUDY OF AN ERICSSON MAGNETIC REFRIGERATOR FOR LOW TEMPERATURE. DESIGN AND TEST OF A REFRIGERATOR.

[In Japanese. / En japonais.]

Author(s) : MATSUMOTO K.

Type of article: Article

Summary

ERICSSON MAGNETIC REFRIGERATION HAS BEEN STUDIED IN THE TEMPERATURE RANGE FROM 20 TO 77 K. IN THIS TEMPERATURE RANGE, IT IS NECESSARY TO USE FERROMAGNETIC MATERIAL AS THE MAGNETIC REFRIGERANT, BECAUSE IT HAS THE INTERNAL MAGNETIC FIELD WHICH ARRANGES THE SPIN SYSTEM. ABOVE 20 K SINCE THE LATTICE ENTROPY GROWS ALMOST COMPARABLE TO OR LARGER THAN THE MAGNETIC ENTROPY, ONE MUST APPLY ERICSSON CYCLE FOR THE THERMAL CYCLE. IN THE APPARATUS, LEAD WAS USED AS REGENERATOR MATERIAL, AND GASEOUS HELIUM TO TRANSFER HEAT BETWEEN THE 2 SOLIDS. IN THE PAPER, THE PRIMARY EXPERIMENTAL RESULTS ARE DESCRIBED. THE MAGNETIC WORKING SUBSTANCE WAS A DYSPROSIUM-ALUMINIUM SINTERED COMPOUND WITH A CURIE TEMPERATURE OF 49.8 K. 2 KINDS OF REGENERATOR WERE TESTED. AT THE CYCLE OF 300 S AND A FIELD OF 5 T, THE MAGNETIC SUBSTANCE CHANGED IN TEMPERATURE BETWEEN 48.3 AND 59.1 K AND REGENERATOR PRODUCED A TEMPERATURE OF 50.3 AND 58.7 K AT THE COLD AND HOT END, RESPECTIVELY.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1988-2148
  • Languages: Japanese
  • Source: Cryogenics/ Cryog. Eng. - vol. 22 - n. 6
  • Publication date: 1987
  • Document available for consultation in the library of the IIR headquarters only.

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