非晶态Mg70Zn30合金结构因子的预峰

利用X射线衍射仪对非晶态Mg₇₀Zn₃₀合金的结构进行了研究,获得了强度曲线、结构因子、双体分布函数和原子间最近邻距离.结果表明,Mg₇₀Zn₃₀合金在小Q区间存在强烈的预峰现象.根据预峰的特性,提出了Mg₇₀Zn₃₀熔体的结构模型,即Mg原子位于中心,8个Zn原子位于顶角所形成的简单立方结构模型.该模型以共享顶点的方式相连接,能够满足预峰对Mg—Mg原子间距离的要求.Mg<关键词：非晶态70Zn₃₀合金')" href="#">Mg₇₀Zn₃₀合金结构因子预峰

PRE-PEAK ON THE STRUCTURE FACTOR OF NON-CRYSTALLINE ALLOY Mg70Zn30

Using the X-ray diffraction techniques, the intensity, structure factor, pair distribution function and the nearest neighbor distance of non-crystalline alloy Mg₇₀Zn₃₀ were obtained. The experimental results show that there is a visible pre-peak on the structure factor of non-crystalline alloy Mg₇₀Zn₃₀ in the small Q region. According to the characters of the pre-peak, an atomic model of Mg₇₀Zn₃₀ melt was constructed, namely, a bcc structure with one Mg atom locates at the center and other eight Zn atoms lie on the vertexes. Combined with shared vertex, it can meet the requirement for the distance of Mg-Mg atoms. The origin of the pre-peak on the structure factor of non-crystalline alloy Mg₇₀Zn₃₀ is caused by the correlation between the central Mg atoms in neighboring clusters.