Charge Redistribution in Pd-Ag Alloys from a Local Perspective

Using Pd and Ag ${\mathit{L}}_{3,2}$-edge x-ray-absorption near edge structures (XANES) and x-ray photoemission spectroscopy, we have investigated the charge distribution in a series of Pd-Ag alloys (P${\mathrm{d}}_{3}$Ag, PdAg, and PdA${\mathrm{g}}_{3}$) from a local perspective. It is found that, relative to the pure element, both Pd and Ag gain ${\mathit{d}\phantom{\rule{0ex}{0ex}}\mathrm{a}\mathrm{n}\mathrm{d}\phantom{\rule{0ex}{0ex}}\mathrm{l}\mathrm{o}\mathrm{s}\mathrm{e}\phantom{\rule{0ex}{0ex}}\mathrm{n}\mathrm{o}\mathrm{n}\ensuremath{-}\mathit{d}\phantom{\rule{0ex}{0ex}}(\mathit{s}\mathrm{and}\mathit{p})\phantom{\rule{0ex}{0ex}}\mathrm{c}\mathrm{h}\mathrm{a}\mathrm{r}\mathrm{g}\mathrm{e}\phantom{\rule{0ex}{0ex}}\mathrm{u}\mathrm{p}\mathrm{o}\mathrm{n}\phantom{\rule{0ex}{0ex}}\mathrm{a}\mathrm{l}\mathrm{l}\mathrm{o}\mathrm{y}\mathrm{i}\mathrm{n}\mathrm{g}.\phantom{\rule{0ex}{0ex}}\mathrm{T}\mathrm{h}\mathrm{e}\phantom{\rule{0ex}{0ex}}\mathrm{r}\mathrm{e}\mathrm{s}\mathrm{u}\mathrm{l}\mathrm{t}\mathrm{s}\phantom{\rule{0ex}{0ex}}\mathrm{a}\mathrm{r}\mathrm{e}\phantom{\rule{0ex}{0ex}}\mathrm{d}\mathrm{i}\mathrm{s}\mathrm{c}\mathrm{u}\mathrm{s}\mathrm{s}\mathrm{e}\mathrm{d}\phantom{\rule{0ex}{0ex}}\mathrm{i}\mathrm{n}\phantom{\rule{0ex}{0ex}}\mathrm{t}\mathrm{e}\mathrm{r}\mathrm{m}\mathrm{s}\phantom{\rule{0ex}{0ex}}\mathrm{o}\mathrm{f}\phantom{\rule{0ex}{0ex}}\mathrm{b}\mathrm{a}\mathrm{n}\mathrm{d}\phantom{\rule{0ex}{0ex}}\mathrm{f}\mathrm{i}\mathrm{l}\mathrm{l}\mathrm{i}\mathrm{n}\mathrm{g},\phantom{\rule{0ex}{0ex}}\mathrm{r}\mathrm{e}\mathrm{h}\mathrm{y}\mathrm{b}\mathrm{r}\mathrm{i}\mathrm{d}\mathrm{i}\mathrm{z}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n},\phantom{\rule{0ex}{0ex}}\mathrm{e}\mathrm{l}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{n}\mathrm{e}\mathrm{g}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{v}\mathrm{i}\mathrm{t}\mathrm{y},\phantom{\rule{0ex}{0ex}}\mathrm{a}\mathrm{n}\mathrm{d}\phantom{\rule{0ex}{0ex}}\mathrm{e}\mathrm{l}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{n}\mathrm{e}\mathrm{u}\mathrm{t}\mathrm{r}\mathrm{a}\mathrm{l}\mathrm{i}\mathrm{t}\mathrm{y}\phantom{\rule{0ex}{0ex}}\mathrm{c}\mathrm{o}\mathrm{n}\mathrm{s}\mathrm{i}\mathrm{d}\mathrm{e}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\mathrm{s}.\phantom{\rule{0ex}{0ex}}\mathrm{The}\mathrm{possibility}\mathrm{of}\mathrm{using}\mathrm{the}\mathit{L}}_{3,2}$-edge XANES white line to circumvent the need of an appropriate volume for charge transfer discussions and for other applications are noted.