使用扩展X射线吸收精细结构谱（EXELFS）和扩展X射线吸收精细结构（EXAFS）作为互补探针的金属玻璃系统的结构。

The structure of a metallic glass system using EXELFS and EXAFS as complementary probes.

作者信息

Alamgir Faisal M, Jain Himanshu, Williams David B, Schwarz Ricardo B

机构信息

Brookhaven National Laboratory and the Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, NY 10021, USA.

出版信息

Micron. 2003;34(8):433-9. doi: 10.1016/S0968-4328(03)00100-8.

DOI:10.1016/S0968-4328(03)00100-8

PMID:14680930

Abstract

The short-range atomic order around all three constituent atoms in a prototypical bulk metallic glass (BMG) system was probed in a complementary way, using extended X-ray absorption fine structure for neighborhood of the higher atomic number elements, and extended energy loss fine structure (EXELFS) for the lower atomic number ones. The Pd(x)Ni((80-x))P((20)) system is a prototype for a whole class of BMG formers which are 80% transition metal and 20% metalloid. We find that the structure of these BMGs could be explained in terms of those of glasses at the end of the BMG range, namely, Pd(60)Ni(20)P(20) and Pd(30)Ni(50)P(20). The binary phosphide crystals near [Formula: see text] and 80 are found to be simulate very well the local atomic structure of Pd(30)Ni(50)P(20) and Pd(60)Ni(20)P(20) glasses, respectively. The best glass former in this series, Pd(40)Ni(40)P(20), is best described by a weighted average of Pd(30)Ni(50)P(20) and Pd(60)Ni(20)P(20) structures.

摘要

采用互补的方法，利用扩展X射线吸收精细结构研究了典型块状金属玻璃（BMG）体系中所有三种组成原子周围的短程原子序，用于研究较高原子序数元素的邻域，利用扩展能量损失精细结构（EXELFS）研究较低原子序数元素的邻域。Pd(x)Ni((80 - x))P((20))体系是一类BMG形成剂的原型，这类形成剂由80%的过渡金属和20%的类金属组成。我们发现，这些BMG的结构可以用BMG范围末端的玻璃结构来解释，即Pd(60)Ni(20)P(20)和Pd(30)Ni(50)P(20)。发现靠近[公式：见原文]和80的二元磷化物晶体分别很好地模拟了Pd(30)Ni(50)P(20)和Pd(60)Ni(20)P(20)玻璃的局部原子结构。该系列中最佳的玻璃形成剂Pd(40)Ni(40)P(20)，最好用Pd(30)Ni(50)P(20)和Pd(60)Ni(20)P(20)结构的加权平均值来描述。