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测量了磁性纳米Fe3O4颗粒的X射线衍射谱(XRD)、正电子湮没寿命谱(PALS)和符合多普勒展宽谱(CDBS),研究了不同压力和退火温度对磁性纳米Fe3O4颗粒物相、电子结构、缺陷及电子动量分布等的影响.XRD,PALS,CDBS测量结果表明:纳米Fe3O4颗粒的缺陷浓度随压力的增加而增大,但物相和缺陷类型并未发生变化;磁性纳米Fe3O4颗粒的物相、缺陷类型及缺陷数量随着退火温度的提高发生了显著的变化;大气环境中压成的纳米Fe3O4样品,相变发生在350—500℃范围内.随着退火温度的提高,纳米Fe3O4颗粒长大导致使界面缺陷数量减少、S参数变小、商谱高动量区的升高.
The magnetic nano-Fe3O4 particles were characterized by X-ray diffraction (XRD), positron annihilation lifetime spectroscopy (PALS) and Doppler broadening spectrum (CDBS). The effects of different pressure and annealing temperature on the magnetic phase, , Defects and electron momentum distribution, etc. The results of XRD, PALS and CDBS show that the defect concentration of Fe3O4 nano-particles increases with the increase of pressure, but the phase and defect types do not change. The magnetic nano-Fe3O4 particles Phase, type of defects and the number of defects with the annealing temperature increased significantly; Atmospheric environment into the nano-Fe3O4 samples, the phase transition occurred in the range of 350-500 ° C. With the annealing temperature increased, the nano-Fe3O4 particles Growing up leads to a decrease in the number of interface defects, a decrease in S-parameters, and an increase in the high momentum area of the commercial spectrum.