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| Magnetocaloric effect of La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$ |
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| 河北师范大学 |
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Cite this article:
;. Magnetocaloric effect of La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$. Chin J Mater Res, 2004, 18(3): 333-336.
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Abstract Polycrystalline samples of La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$
($x$=0.00, 0.02, 0.06, and 0.10) with different vacancies in La$^{3+}$--site
were prepared by sol--gel method. The grain sizes of samples were observed
by SEM. XRD results show that the samples are single phase of perovskite--type
oxides. The Curie temperatures and the magnetic entropy change of the samples
were studied by VSM. The influence of the vacancy concentration in
La$^{3+}$--site on their magnetocaloric properties has been investigated.
The higher Curie temperatures close to room temperature and the larger
magnetic entropy changes have been observed. The maximum magnetic entropy
change, 2.78 J/(kg$\cdot$K), is obtained near its Curie temperature (277 K) under
the field of 1 T for La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$ ($x$=0.02) sample.
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Received: 19 July 2004
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