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Research

Most of our research involves the measurement of short- to intermediate-range structure in silicate and oxide materials, although we occasionally work on other materials such as fluorides and even biological solids. In many cases, questions involve the nature and extent of structural disorder, whether this involves mixing of cations on sites in a mineral or ceramic, the network linkages in a glass, or the role of "defect" species that contribute disproportionately to the overall energetics. Our overall goal is to constrain models that can be used to understand and predict physical and chemical properties; our major research tool is solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.

We are currently using high temperature MAS NMR to measure the rate of exchange among network species, such as three- and four-coordinated boron, in multicomponent borosilicate melts to tempe

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Most solid-state NMR studies on minerals and other silicates and oxides have been done on materials with very low contents of ions with unpaired electron spins (e.g.

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In ongoing collaborations with colleagues in high-pressure labs, we are exploring the extent of cation disorder and the mechanisms of solid solution in a number of silicates that are importan

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High-performance mirrors in optical systems are often made of a stack of alternating thin layers of amorphous oxides with high and low refractive indices, which can give extremely high reflec

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In several recent and ongoing collaborative studies, we have studied the structures of aluminosilicate glasses quenched from melts at pressures up to 10 to 12 GPa in multi-anvil apparatus in

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Multi-component borosilicate glasses have many applications, such as fiber reinforcements in composites, in flat-panel display screens for computers and cell phones, and in nuclear waste sequ

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We are currently working on several simple aluminosilicate glass ternary systems, to better refine the extent of disorder in the tetrahedral network structure, and the role of structural spec

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