【摘 要】
：
近年来,全球能源危机和温室效应不断加剧,磁制冷技术以其节能环保等优点引起了世界各国的广泛关注[1].从1997年起,人们相继发现了大量的巨磁热效应合金系,如Gd5(SixGe1-x)4合
【机 构】
：
中国科学院磁性材料与器件重点实验室,中国科学院宁波材料技术与工程研究所,宁波315201
【出 处】
：
第三届全国磁热效应材料和磁制冷技术学术研讨会
论文部分内容阅读
近年来,全球能源危机和温室效应不断加剧,磁制冷技术以其节能环保等优点引起了世界各国的广泛关注[1].从1997年起,人们相继发现了大量的巨磁热效应合金系,如Gd5(SixGe1-x)4合金,NaZn13结构的La(FexSi1-x)13合金,六方MnFeP(As,Ge,Si),Heusler型铁磁形状记忆材料,以及类钙钛矿型锰氧化物等.其中,NaZn13型LaFeSi基合金具有大磁熵变、无毒、窄滞后、低成本等优点,因而被认为最具应用前景的磁制冷材料之一[2,3].对于La(FexSi1-x)13合金,随着Si含量的增加,磁转变类型逐渐从一级演变为二级相变,因此,当x≥1.6时,合金具有明显低的磁熵变.而低Si的块体合金通常需要长时间退火(如1300K,7D)才能获得较纯的大磁热效应相.
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