科研之友
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摘要
Magnetocaloric effect and specific heat of a La0.845Sr0.155MnO3 sample were measured over a temperature range of 4.2-300 K, to verify whether large entropy changes induced by magnetic field make possible the use of manganites for magnetic refrigeration and whether a magnetostrictive contribution to magnetocaloric effect is significant. Isothermal entropy change and adiabatic temperature change induced by DeltaB = 7 T were determined as functions of temperature. Near to the Curie temperature, T-C approximate to 234 K, they reach, respectively, similar to -6.6 J/(kg K) and similar to3.4 K, i.e., the values similar to2 and similar to4 times smaller than for Gd. Despite the presence of large magnetostriction, its contribution to magnetocaloric effect was found negligible.
- 出版日期2003-8-1
