Characteristic chemical shift of quasicrystalline alloy Al 53Si27Mn20 studied by EELS and SXES

S. Koshiya, M. Terauchi, A. P. Tsai

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Chemical shifts of all constituent atoms for amorphous (Am), quasicrystalline (QC) and crystalline (Cryst) alloys of Al 53Si27Mn20 were investigated for the first time by high energy-resolution electron energy-loss spectroscopy (EELS) and soft-X-ray emission spectroscopy (SXES). Among Al L-shell excitation EELS spectra of Am, QC and Cryst alloys, only QC alloy showed an apparent chemical shift to the larger binding energy side by 0.4 eV. In Al-Kα and Si-K α emission SXES spectra of these alloys, only QC alloy showed a chemical shift to the larger binding energy side by 4 eV for Al-K α and 6eV for Si-Kα. These chemical shift values are comparable to those of corresponding metal oxides. This indicates a smaller amount of valence charge at Al and Si atomic sites in QC alloy. On the other hand, Mn-L SXES spectra did not show any chemical shift. Therefore, the decreased charge from Al and Si sites should be distributed between atomic sites, indicating the presence of covalent bonding nature for QC ordered alloy.

    Original languageEnglish
    Pages (from-to)2309-2316
    Number of pages8
    JournalPhilosophical Magazine
    Volume91
    Issue number18
    DOIs
    Publication statusPublished - 2011 Jun 21

    Keywords

    • Al-Si-Mn alloy
    • Chemical shift
    • Electronic structure
    • Quasicrystalline alloy
    • Spectroscopy

    ASJC Scopus subject areas

    • Condensed Matter Physics

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