Speaker:  Michael Treacy, Arizona State University

Title: Inferring Medium Range Order in Amorphous Materials from the Structural Fluctuations

Abstract: Fluctuation Electron Microscopy (FEM) has become an effective tool for detecting medium range atomic ordering in glasses and amorphous materials. This success arises from the statistical approach of examining differences in scattering between small volumes. Whereas the mean scattering properties are related to the mean diffracted intensity, the variance of the scattering properties reveals the underlying structural fluctuations. By examining the variance as a function of scattering conditions, structural "noise" (true random fluctuations) can be differentiated from the underlying structural trends.

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