| Original Articles |
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Structure and Magnetocaloric Properties in Perovskitelike Lal-xNaxMnOz Powders |
| CHEN Wei1,3;ZHONG Wei1,2;HOU Deng-lu3;DING Wei-ping2;DU You-wei1;YAN Qi-jie2 |
| 1National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093
2Department of Chemistry, Nanjing University, Nanjing 210093
3Department of Physics, Hebei Normal University, Shijiazhuang 050091
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| Cite this article: |
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CHEN Wei, ZHONG Wei, HOU Deng-lu et al 1998 Chin. Phys. Lett. 15 134-136 |
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Abstract Perovskitelike manganese oxides Lal-xNaxMnOz (x = 0.075, 0.100, 0.165, 0.200) have been fabricated using sol-gel technique. Structure analysis, temperature programmed reduction (TPR) technique and magnetic measurement have been used to study the effect of Na ion substituted amount on Mn-O distance, the oxygen content, and the magnetocaloric properties of these materials. Results show there is no clear correlation between the substituted amount and mean Mn valence, but a close relationship is observed between Tc and the bond distance of Mn-O. These materials have quite large magnetic entropy changes upon an application of a low magnetic field and can be utilized as more suitable candidates for magnetic refrigerants with wide temperature span.
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| Keywords:
75.30.Sg
82.80.-d
81.70.-q
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Published: 01 February 1998
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| PACS: |
75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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82.80.-d
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(Chemical analysis and related physical methods of analysis)
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81.70.-q
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(Methods of materials testing and analysis)
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