Specific heat and magnetic entropy associated with magnetic ordering in al-rich RAL2 sintered compounds

M. Sahashi, H. Niu, Y. Tohkai, K. Inomata, T. Hashimoto, T. Kuzuhara, A. Tomokiyo, H. Yayama

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Crystallographic and thermo-magnetic measurements have been made on the sintered RAl2 intermetallic compounds where R=Gd, Tb, Dy, Ho and Er. These Laves phase compounds are important ferromagnetic substances for the Ericsson type magnetic refrigerator in the temperature range above 10 K. The powder. rnetal-lurgic approach was used to prepare the samples. The sintering characteristics in the R-Al system were clarified in the previous paper. Based on that resuit, the RAl2.2 system was selected in this investigation. Thermo-magnetic measurements show that Curie temperatures for the RA12.2 sintered compounds are inclined to be about 2 to 15 K lower than those for stoichiometric compounds. In this paper, specific heat and magnetic entropy values for the above Al-rich RAl2 high density sintereq compounds are shown in respect to application to magnetic refrigerants in the above 10 K temperature range. Then, the RA13 phase contribution in RA12.2 sintered compounds to niagnetic entropy and its magnetic properties are discussed.

Original languageEnglish
Pages (from-to)2853-2855
Number of pages3
JournalIEEE Transactions on Magnetics
Volume23
Issue number5
DOIs
Publication statusPublished - Sep 1987

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Magnetic variables measurement
Specific heat
Magnetization
Entropy
Refrigerators
Refrigerants
Curie temperature
Powders
Intermetallics
Magnetic properties
Sintering
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Specific heat and magnetic entropy associated with magnetic ordering in al-rich RAL2 sintered compounds. / Sahashi, M.; Niu, H.; Tohkai, Y.; Inomata, K.; Hashimoto, T.; Kuzuhara, T.; Tomokiyo, A.; Yayama, H.

In: IEEE Transactions on Magnetics, Vol. 23, No. 5, 09.1987, p. 2853-2855.

Research output: Contribution to journalArticle

Sahashi, M, Niu, H, Tohkai, Y, Inomata, K, Hashimoto, T, Kuzuhara, T, Tomokiyo, A & Yayama, H 1987, 'Specific heat and magnetic entropy associated with magnetic ordering in al-rich RAL2 sintered compounds', IEEE Transactions on Magnetics, vol. 23, no. 5, pp. 2853-2855. https://doi.org/10.1109/TMAG.1987.1065718
Sahashi, M. ; Niu, H. ; Tohkai, Y. ; Inomata, K. ; Hashimoto, T. ; Kuzuhara, T. ; Tomokiyo, A. ; Yayama, H. / Specific heat and magnetic entropy associated with magnetic ordering in al-rich RAL2 sintered compounds. In: IEEE Transactions on Magnetics. 1987 ; Vol. 23, No. 5. pp. 2853-2855.
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AB - Crystallographic and thermo-magnetic measurements have been made on the sintered RAl2 intermetallic compounds where R=Gd, Tb, Dy, Ho and Er. These Laves phase compounds are important ferromagnetic substances for the Ericsson type magnetic refrigerator in the temperature range above 10 K. The powder. rnetal-lurgic approach was used to prepare the samples. The sintering characteristics in the R-Al system were clarified in the previous paper. Based on that resuit, the RAl2.2 system was selected in this investigation. Thermo-magnetic measurements show that Curie temperatures for the RA12.2 sintered compounds are inclined to be about 2 to 15 K lower than those for stoichiometric compounds. In this paper, specific heat and magnetic entropy values for the above Al-rich RAl2 high density sintereq compounds are shown in respect to application to magnetic refrigerants in the above 10 K temperature range. Then, the RA13 phase contribution in RA12.2 sintered compounds to niagnetic entropy and its magnetic properties are discussed.

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