Iwamoto Takashi, Matsumoto Kinya, Kitamoto Yoshitaka, Toshima Naoki
Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8502, Japan.
J Colloid Interface Sci. 2007 Apr 15;308(2):564-7. doi: 10.1016/j.jcis.2007.01.049. Epub 2007 Jan 25.
Direct synthesis of fct-structured FePt nanoparticles was successfully achieved by using poly(N-vinyl-2-pyrrolidone) as a protective reagent at lower temperature than the case using low molecular weight ligands as a protective reagent. Experimental data suggest that a transformation of FePt nanoparticles from face-centered cubic to face-centered tetragonal (fct) structure takes place at reaction temperature of 261 degrees C. The results of XRD and the magnetic properties exhibit that the FePt nanoparticles synthesized at 261 degrees C have partially ordered fct-structure and a ferromagnetic behavior at room temperature.
通过使用聚（N-乙烯基-2-吡咯烷酮）作为保护剂，在比使用低分子量配体作为保护剂更低的温度下成功实现了fct结构的FePt纳米颗粒的直接合成。实验数据表明，FePt纳米颗粒在261℃的反应温度下从面心立方结构转变为面心四方（fct）结构。XRD结果和磁性表明，在261℃合成的FePt纳米颗粒具有部分有序的fct结构，并且在室温下具有铁磁行为。
