高压Ni_(77)P_(23)非晶合金自由体积变化的同步辐射研究

Study on free volume change in the NiP amorphous alloy under high pressure using synchrotron radiation

利用同步辐射高能X光散射的方法,研究了室温下非晶合金Ni77P23的自由体积的变化所引起的压缩行为的变化规律,通过傅里叶变换得到不同压力下的径向分布函数,并由此获得了不同压力下,该非晶合金的配位数、近邻原子间距等原子构型的结构信息.研究表明,至直30·5GPa压力,Ni77P23合金仍保持稳定的非晶结构,根据Bridgman方程通过拟合数据,得到状态方程为-ΔV/V0=0·08606P-3·2×10-4P2+5·7×10-6P3.

In situ high pressure energy dispersive X-ray diffraction with a synchrotron radiation source has been used to investigated the free volume change in Ni77 P23 amorphous alloy up to 30.5 GPa at room temperature in a diamond-anvil cell. The atomic configuration information such as coordination number and atomic spacing was derived by radial distribution function via Fourier transformation. The results show that in the pressure range of 0-30.5 GPa, the structure of Ni77P23 amorphous alloy is stable. The compression behavior is investigated using in-situ high pressure measurment. The equation of state - △ V/V0 = 0. 08606P - 3.2×10^-4p^2＋5.7×10^-6p^3 is determined by fitting the experimental data according to the Bridgman equation.