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Tai Nguyen So - Vietnam National University, Ha Noi - VNU >
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| Title: | Some properties of La-deficient La0.54Ca0.32MnO3-δ |
| Authors: | Sinh N.H.
Thuy N.P. |
| Keywords: | La-deficient La0.54Ca0.32MnO3-δ, Magnetic-entropy change
Oxidation
Ratio Mn3+/Mn4+
Saturation moment |
| Issue Date: | 2003 |
| Publisher: | Journal of Magnetism and Magnetic Materials |
| Citation: | Volume 262, Issue 3, Page 502-507 |
| Abstract: | A La-deficient sample of La0.54Ca0.32MnO3-δ was prepared by the solid-state reaction method. The Curie temperature TC equals 300 K, which is significantly higher than those of the La1-xCaxMnO3-δ system. 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. A saturation magnetic moment σS = 2.99 μB/f.u. at 5 K has been derived from the magnetization data. Values of 0.0230 and 0.441 for the oxygen deficiency δ and the ratio of Mn3+/Mn4+, respectively, have been determined. From our study, it is suggested that this compound is a suitable candidate for application as a working substance in magnetic refrigeration. © 2003 Elsevier Science B.V. All rights reserved. |
| URI: | http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/11861 |
| ISSN: | 3048853 |
| Appears in Collections: | Articles of Universities of Vietnam from Scopus
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