### Session L27: Glassy Systems

2:30 PM–5:06 PM, Tuesday, March 6, 2007

Chair: Dimitrios Papaconstantopoulos, George Mason University

Abstract ID: BAPS.2007.MAR.L27.11

### Abstract: L27.00011 : X-ray and Neutron Scattering Studies of Methyl Iodide Confined in GelTech$_{\copyright}$ Glass

4:30 PM–4:42 PM

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#### Authors:

Yvonne Glanville
(Penn State University)

Paul Sokol
(Indiana University Cyclotron Facility)

Steven Ehrlich
(National Synchotron Light Source)

X-ray diffraction and neutron scattering studies of methyl iodide confined in 200 {\AA} GelTech$_{\copyright }$ glass have revealed a never before observed intermediate solid phase of methyl iodide. Bulk methyl iodide has one phase transition below room temperature, at 207 K where it transitions from a liquid to an orthorhombic solid. Neutron scattering studies of the diffusion of methyl iodide confined in the 200 {\AA} pores show a transition from a liquid to a solid at 203 K. X-ray diffraction measurements support this finding and identify the transition as one from a liquid to the never before observed amorphous solid. The amorphous solid remains down to 168 K upon cooling at which point a second transition appears from the amorphous solid to an orthorhombic solid, which upon indexing is identical to the bulk.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.L27.11