Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 92: Issue 3
The magnetocaloric effect of superfine magnets
Authors:
V. Korolev Institute of Solution Chemistry of RAS Ivanovo Russia

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I. Arefyev Institute of Solution Chemistry of RAS Ivanovo Russia

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A. Ramazanova Institute of Solution Chemistry of RAS Ivanovo Russia

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Pages:
691–695
Online Publication Date:
02 Jul 2008
Publication Date:
01 Jun 2008
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-008-9018-y
Keywords:
ferrites; hematite; maghemite; magnetite; magnetocaloric effect; microcalorimeter; second-order phase transition
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Abstract  

The magnetocaloric effect (MCE) of aqua suspensions based on superfine magnetite (Fe3O4), hematite (α-Fe2O3), maghemite (γ-Fe2O3), samarium ferrite (SmFe2O4) and gadolinium ferrite (GdFe2O4) as well as of magnetite-based ferrofluids was calorimetrically determined in the range of the temperatures from 283 to 253 K. MCE has a positive magnitude for all investigated systems except a hematite-based system. For the suspensions on the basis of MCE temperature dependence it was determined that superfine magnetite transformed into α-Fe2O3 at the temperature above 328 K in contrast to monocrystal magnetite. For aqua suspensions of samarium ferrite and gadolinium ferrite and magnetite-based ferrofluids MCE temperature dependence has an extreme behavior which is connected with a second-order phase transition. For the first time it is established that the magnetocaloric effect (MCE) is greatly increased when the magnet is a nanosized material.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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