Mn1.1Fe0.9P0.8Ge0.2室温磁致冷材料的制备新技术  

New preparation poute of Mn1.1Fe0.9P0.8Ge0.2 room temperature magneto-caloric materials

作　　者：王小路[1] 刘越[1] 岳明[1] 曾宏[1] 张久兴[1] 

机构地区：[1]北京工业大学新型功能材料教育部重点实验室,北京100022

出　　处：《功能材料》2007年第A03期1171-1172,共2页Journal of Functional Materials

基　　金：国家高技术研究发展计划（863计划）资助项目（2002AA324010）.

摘　　要：利用机械合金化（mechanical alloying，简称MA）和放电等离子烧结技术（spark plasma sintering，简称SPS技术）制备了Mn1.1Fe0.9P0.8Ge0.2室温磁致冷材料。利用XRD和SEM分析了烧结样品的相结构和显微组织．发现材料在合金化之后形成了单相结构，并在SPS烧结后保持不变。此外DSC的测量结果表明所制备烧结样品的居里温度瓦在-11℃附近，可应用于室温区磁制冷。上述结果说明利用MA和SPS技术合成Mn1.1Fe0.9P0.8Ge0.2是一种简易、有效的新途径。Mn1.1Fe0.9P0.8Ge0.2 compound has been prepared via diffusion synthesis route by using mechanical alloying and subsequent spark plasma sintering （SPS） technique. Composition and microstructure of the milled powders and sintered bulk sample were investigated by XRD and SEM, respectively. The magnetic transition temperature of the bulk sample was measured by means of differential scanning calorimetry （DSC） meter. XR results show that both the powders and bulk sample exhibit hexagonal Fe2P-type crystal structure, which indicates that the present synthesis route is feasible. SEM observation shows the microstructure of the bulk material was composed of pure Mn1.1Fe0.9P0.8Ge0.2 grains with average size of about 10 micrometer. DSC result shows that the magnetic transition temperature is located around -11℃, which is around room temperature.

关 键 词：室温磁制冷 机械合金化 放电等离子烧结 Mn1.1Fe0.9P0.8Ge0.2 

分 类 号：TM273[一般工业技术—材料科学与工程]