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Structural Study of Amorphous Intermetallic MoGe3 by Anomalous X-ray Scattering

-Hope Erikson, Stanford University

The Mo-Ge amorphous alloy system undergoes a metal-insulator transition near 15 at% Mo. Previous structural studies of the Mo-Ge amorphous system have shown that at concentrations of Mo between 0 and ~23 at%, two phases coexist: amorphous Ge and a Mo-modified phase with composition corresponding to MoGe3, a composition not present in the equilibrium phase diagram. Although similar systems consisting of metals alloyed with Si or Ge also demonstrate phase separation at low metal concentrations, the second phase is, as expected, a disilicide or digermanide, a composition existing in the equilibrium phase diagram. We would like to gain a better understanding of why the MoGe3 stoichiometry is a metastable phase in the the amorphous Mo-Ge system and what role it might play in the metal-insulator transition. In this talk, I will present our proposal to determine the partial distribution functions of the a-MoGe3 phase by anomalous x-ray scattering.

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