Large magnetocaloric effect in perovskite manganites: magnetic entropy changes above 300 K

• Autorzy: Phan M. H. , Yu S. C. , Ulyanov A. N. , Lachowicz H. K.
• Języki publikacji: EN

Abstrakty

EN

We present here, the results of an investigation of the large magnetic entropy change, M S D , above 300 K in a series of La0.65Sr0.35MnO3, La0.6Sr0.2Ca0.2MnO3, La0.6Sr0.2Ba0.2MnO3, La0.7Ba0.3MnO3 and La0.7Ba0.24Ca0.06MnO3 perovskite manganites. Among the studied compositions, La0.6Sr0.2Ba0.2MnO3 exhibits a highest value of 2.26 J/kg/K for |ASMmax| at the Curie temperature, TC = 354 K, when the field is changed from 0 to 10 kOe. The adiabatic temperature change, ATad, of this sample is ~ 1.1 K and ~ 4.95 K in the fields of 10 kOe and 50 kOe, respectively. Since the large magnetocaloric effect was found in the present materials with above 300 K Curie temperature, these materials seem to be attractive for above room temperature magnetic refrigeration applications.

Słowa kluczowe

EN

entropy; magnetocaloric effect; magnetic refrigeration; perovskite; double exchange

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Materials Science
• Rocznik: 2003
• Tom: Vol. 21, No. 1
• Strony: 133--139
• Opis fizyczny: Bibliogr. 14 poz.

Twórcy

autor

Phan M. H.

• Department of Physics, Chungbuk National University, Cheongju, Korea

autor

Yu S. C.

• Department of Physics, Chungbuk National University, Cheongju, Korea

autor

Ulyanov A. N.

• Department of Physics, Chungbuk National University, Cheongju, Korea
• Donetsk Physico-Technical Institute of National Academy of Sciences, Ukraine

autor

Lachowicz H. K.

• Institute of Physics, Polish Academy of Science, al. Lotników 32/46, 02-668 Warszawa, Poland

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