Magnetocaloric Effects of Barium-Strontium Ferrites for Magnetic Refrigeration System
Autor: | S. I. Liba, Hasan Khaled Rouf, Ummay Habiba, Sheikh Manjura Hoque |
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Rok vydání: | 2018 |
Předmět: |
010302 applied physics
Strontium Materials science Condensed matter physics hexaferrites chemistry.chemical_element Barium 02 engineering and technology General Medicine 021001 nanoscience & nanotechnology ferromagnetism magnetic entropy 01 natural sciences chemistry Ferromagnetism 0103 physical sciences lcsh:TA401-492 Magnetic refrigeration magnetocaloric effects lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
Zdroj: | European Journal of Materials Science and Engineering, Vol 3, Iss 4, Pp 195-202 (2018) |
ISSN: | 2541-8513 2414-4606 |
DOI: | 10.17277/amt.2018.04.pp.025-030 |
Popis: | A study of the magnetocaloric effect (MCE) of Barium-Strontium-Ferrites BaO•SrO•xFe2O3 and BaO•SrO•xFe3O4 (x=5.6, 5.8, 6) is reported in this article. Using hematite of analytical grade and magnetite from Cox’s Bazar beach sand mineral as ferrite contents, the hexaferrites were synthesized and their magnetic properties and MCE were systematically studied. The results indicate that the samples are strongly ferromagnetic and have high Curie temperature. All the samples are of second-ordered phase and exhibit large magnetic entropy changes. Among all the samples BaO•SrO•5.8Fe2O3 and BaO•SrO•5.8Fe3O4 exhibit the maximum entropy changes at the temperatures near and below the Curie temperature. |
Databáze: | OpenAIRE |
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