Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy.

ABSTRACT: Experimental detection of the Pt 5d densities of states in the valence band is conducted on a series of Pt-Ni alloys by high energy resolution valence-to-core X-ray emission spectroscopy (VTC-XES) at the Pt L₃-edge. VTC-XES measurements reveal that the Pt d-band centroid shifts away from the Fermi level upon dilution, accompanied by concentration-dependent Pt d-band width. The competition between the strain effect and ligand effect is observed experimentally for the first time. It is found that the d-band widths in Pt₃Ni and PtNi are broader than that of Pt metal due to compressive strain which overcompensates the effect of dilution, while it is narrower in PtNi₃ where the ligand effect dominates. VTC-XES is demonstrated to be a powerful tool to study the P

SUBMITTER: Chen J 

PROVIDER: S-EPMC8249455 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature