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

✍ Scribed by Faisal M. Alamgir; Himanshu Jain; David B. Williams; Ricardo B. Schwarz

• Book ID: 104369052
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 362 KB
• Volume: 34
• Category: Article
• ISSN: 0968-4328
• DOI: 10.1016/s0968-4328(03)00100-8

✦ Synopsis

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 ð80 2 xÞ 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 x ¼ 0 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.