A Study on Chemical Short Range Ordering in Pd_(40)Ni_(40)P_(20) Bulk Metallic Glass by Anomalous X-ray Scattering

摘要

A local change in the amorphous structure of bulk Pd_(40)Ni_(40)P_(20) glass during the thermal relaxation related to the chemical short-range order (CSRO) was examined by anomalous X-ray scattering (AXS) with energies near Ni and Pd K-absorption edges. The reversible CSRO process was confirmed by electrical resistance and density measurements. The environmental structural analysis around Ni and Pd revealed that the coordination number of Ni-Ni and Pd-Pd like-atom pairs increased with the degree of order formed in the CSRO process, while that of Ni-Pd unlike-atom pair decreased. The present analysis clearly indicates that the reversible CSRO process in the Pd_(40)Ni_(40)P_(20) bulk glass is inferred to be a local structural change such like the micro-phase separation.