Magnetic properties of La0.54Ca0.32MnO3-δ compound
Vietnam Journals Online
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| Title |
Magnetic properties of La0.54Ca0.32MnO3-δ compound
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| Creator |
Nguyen Huy Sinh; Cryogenic Laboratory, Vietnam National University, Hanoi
Do Hong Minh; Cryogenic Laboratory, Vietnam National University, Hanoi Vu Thanh Mai; Cryogenic Laboratory, Vietnam National University, Hanoi |
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| Subject |
Materials Science
magnetic properties — |
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| Description |
Magnetic properties of La0.54Ca0.32MnO3-δ compound have been investigated from 4 K to 320 K. It is found that the Curie temperature is as high as 300 K, which is significantly higher than that of the La1-xCaxMnO3-δ system. The ordering magnetic transition and semiconductor-metal transition have been observed at TC on the magnetization susceptibility and resistivity versus temperature on the magnetization susceptibility resistivity versus temperature curves. The magnetic entropy change reaches a maximum value of - ΔSM = 5.5 J/kg.K at the Curie temperature upon a 5 T magnetic field variation. Saturation magnetic moment value of σs = 2.99μB/fu at 5 K has been obtained from the magnetization data. Values of 0.0230 and 0.441 have been determined for the oxygen deficiency δ and the ratio of Mn3+/Mn4+, respectively. From obtained results it is suggested that this compound may be useful for application as a working substance in magnetic refrigeration at room temperature.
Advances in Natural Sciences Vol.4, No.4 (2003) (339-346)
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| Publisher |
Vietnamese Academy of Science and Technology
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| Contributor |
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| Date |
2008-02-20
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| Type |
Peer-reviewed Article
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| Identifier |
http://www.vjol.info/index.php/ans/article/view/847
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| Source |
Advances in Natural Sciences; Vol 4, No 4 (2003); 339-346
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| Language |
en
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| Coverage |
Vietnam
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