Author/Authors :
Liu، نويسنده , , Yang and Yang، نويسنده , , Yanting and Zhang، نويسنده , , Yongjun and Wang، نويسنده , , Yaxin and Zhang، نويسنده , , Xiaolong and Jiang، نويسنده , , Yuhong and Wei، نويسنده , , Maobin and Liu، نويسنده , , Yanqing and Liu، نويسنده , , Xiaoyan and Yang، نويسنده , , Jinghai، نويسنده ,
Abstract :
The face-centered tetragonal (FCT) ordered L10 CoPt nanoparticles (NPs) are prepared by the sol–gel method. Their structure and magnetic properties are characterized by the X-ray diffraction (XRD), the transmission electron microscope (TEM) and the vibrating sample magnetometer (VSM). The results indicate that the CoPt NPs heated at 400 °C are the disordered face-centered cubic (FCC) structure, whereas the samples annealed at the temperature above 600 °C exhibit an ordered FCT structure. TEM images show the increase of the particle size as the annealing temperature increases. SAED images show the appearance of the L10 phase at 800 °C, and the maximum coercivity is 254,720.3 A/m.
