中文摘要：

晶体结构，巡回电子的元在基于铁的稀土元素的金属间化合的 compoundLa_(0.8 ) 的磁性的转变(IEMT ) andmagnetocaloric 效果(MCE )Ce_(0.2 )Fe_(11.4 )Si_(16 ) 被调查了。粉末 X 光检查衍射表明 La_(0.8 )Ce_(0.2 )Fe_(11.4 )Si_(16 ) 的铸块锭在真空在 1373 K 退火了因为仅仅 5 天能在立方的 NaZn_(13 ) 类型结构被使结晶。La_(0.8 )Ce_(0.2 )Fe_(11.4 )Si_(16 ) 混合物在 Curietemperature T_c (大约 186 K ) 附近展出了等温的熵变化 | 三角洲 S_M|_( 最大) 的巨大的价值。并且在域变化 of0-3 T 下面的大约 78.29 J/(kg-K ) 它能是在 T_c 附近由磁化等温线计算了的最大的值。如此的大 MCE 在 T_c 和导致地的 IEMT 上面的 T_c 的 first-ordermagnetic 转变附近被归因于磁化和危险性的锋利的变化。

英文摘要：

The crystal structure, itinerant-electron metamagnetic transition （IEMT） and magnetocaloric effect （MCE） in the iron-based rare-earth intermetallic compound La0.8Ce0.2Fe11.4Si1.6 have been investigated. The powder X-ray diffraction revealed that the ingot of La0.8Ce0.2Fe11.4Si1.6 annealed at 1373 K in vacuum for only 5 days could be crystallized in the cubic NaZn13-type structure. The La0.8Ce0.2Fe11.4Si1.6 compound exhibited giant values of the isothermal entropy change ASM around the Curie temperature Tc（about 186 K）. And the maximum value ｜△SM｜max is about 78.29J/（kg.K） under a field change of 0-3 T, which can be calculated by the magnetization isotherms around Tc. Such a large MCE is attributed to the sharp change of magnetization and susceptibility around Tc and the first-order magnetic transition of field-induced IEMT above Tc.