College Park, Maryland      June 6 - 10 , 2004

T2-B4 (2:15 PM): Probing the Mechanism of Metal-Halide Network Formation and Crystal Growth (Invited)

J. D. Martin (Department of Chemistry, North Carolina State University)

The ability to design the structure of a material, and to control the influence of that structure on the material's properties is fundamentally important to the development of advanced materials. Crystal engineering has successfully articulated structural principles for the construction diverse materials. However, little is understood regarding the mechanism(s) by which networks are templated and crystals grow. Using a series of low temperature melting network liquids ZnCl2, CuAlCl4 and CuGaCl4 as well as the templated sodalite-type network [HNMe3]CuZn5Cl12 we are able to articulate fundamental mechanistic aspects of network formation and crystallization reactions. Because several of these materials readily form glasses we are able to investigate cold crystallization (from the glass) and hot crystallization (from the melt) allowing us to study crystallization under nucleation- and growth-controlled conditions, respectively. Data from amorphous and crystalline neutron scattering, inelastic neutron scattering, time-resolved synchrotron diffraction, and DSC measurements will be discussed.

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