非晶态FeSiB系合金的正电子湮没及电阻研究

A study of amorphous FeSiB alloys by positron annihilation technique and resistance measurement

本文介绍在室温下测量Fe_(75)Si_(10)B_(15),Fe_(75)Si_(9.5) B_(17.5)和Fe_(71)Si_(14)B_(15)三种非晶态合金从室温到625℃真空退火后的正电子湮没多普勒展宽S参数和电阻率的实验。结果表明,S参数与电阻率随退火温度均呈非单调变化,而且已晶化样品的S参数与原始淬火态的相比,变化仅2％左右,说明这三种非晶态合金的结构与微晶模型相比,更符合无规密堆模型。

The lineshape parameter S (S-parameter) in Doppler broadening spectra of positron annihilation and specific resistance have been measured at room temperature for three amorphous alloys (Fe75Si10B15,Fe73Si9.5Bi17.5 and Fe71Si14B15) after annealing at temperatures in the range of 20-625℃. The experimental results show that the variations of both S-parameter and specific resistance with annealing temperature are non-monotonous. Moreover,the difference of S-parameters between as-quenched sample and crystallized cne is about 2 %, which suggests that structure of the three amorphous alloys accord with the dense random packing structure of hard spheres rather than the microcrystal model.