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- W2019932425 abstract "Small-angle x-ray scattering and x-ray-absorption near-edge spectroscopy (XANES) experiments have been performed on amorphous ${mathrm{Fe}}_{mathit{x}}$${mathrm{Ge}}_{100mathrm{ensuremath{-}}mathit{x}}$ alloys over the composition range 0ensuremath{le}xensuremath{le}72. The observed small-angle x-ray-scattering patterns were compared both with those calculated for a model assuming segregation of the alloys into particular phases and with scattering patterns calculated for voids in a homogeneous matrix. The x-ray-absorption near-edge-structure data were used to test for phase separation. No large-scale phase separation is observed in the semiconductor-metal transition region (15--25 at. % Fe), but fine-scale, kinetically limited phase separation or other types of composition fluctuations cannot be ruled out. The results also indicate that phase separation occurs for alloys with 37ensuremath{le}xensuremath{le}72, with data consistent with separation into amorphous ${mathrm{FeGe}}_{2}$ and ${mathrm{Fe}}_{3}$Ge. Thus, ferromagnetic moment formation occurs in the phase-separated region, with the transition composition (40--43 at. % Fe) probably linked to a-${mathrm{Fe}}_{3}$Ge percolation, as hypothesized by Janot for the related ${mathrm{Fe}}_{mathit{x}}$${mathrm{Sn}}_{100mathrm{ensuremath{-}}mathit{x}}$ system. This phase separation explains the Mossbauer observation of ``magnetic'' and ``nonmagnetic'' Fe atoms in these alloys." @default.
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- W2019932425 title "Structural studies of the phase separation of amorphous<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=italic>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ge</mml:mi></mml:mrow><mml:mrow><mml:mn>100</mml:mn><mml:mi …" @default.
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- W2019932425 doi "https://doi.org/10.1103/physrevb.49.3172" @default.
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