摘要
采用X射线衍射和磁性测量等手段研究了金属间化合物La0.85Ce0.15Fe11.4Si1.6的结构和磁热效应。结果表明,该化合物在211K附近经历了从铁磁到顺磁的二级相变。当外加磁场从0T增加到1.5T时,磁熵变为4.98J/kg.K。通过直接测量的方法得到了La0.85Ce0.15Fe11.4Si1.6化合物在211K的1.0T^0T退磁场的绝热温变为1.1K。大的熵变值和绝热温变表明La0.85Ce0.15Fe11.4Si1.6化合物很有潜力作为相应温区的磁制冷材料。
Crystal structure and magnetic properties of Lao.La0.85Ce0.15Fe11.4Si1.6 were investigated by x- ray powder diffraction and magnetic measurements, which undergoes a second- order transition at 211K from the ferromagnetic to paramagnetic state. The magnetic entropy ctumge upon a field increase from 0T- 1.5T is 4.98J/kg· K. The adiabatic temperature change obtained via direct measurements: reaches 1.1K under a field change from 1.0T - 0T. The large values of entropy change and adiabatic temperature change confirmed the large potential of present compound as a magnetic refrigerant in the corresponding temperature range.
出处
《稀土》
EI
CAS
CSCD
北大核心
2008年第3期85-87,共3页
Chinese Rare Earths
关键词
磁制冷
磁熵变
NaZn13型金属问化合物
magnetic refrigeration
magnetic entropy change
NaZni3 - type intermetallic compound