The simple cubic ReO₃-type framework has all of the key features required for negative thermal expansion (NTE) arising from the transverse thermal motion of bridging atoms and rotation of rigid polyhedra.
Although ReO₃ itself only displays low NTE below ambient temperature, there is a potentially large family of isostructural fluorides and oxyfluorides that could display NTE.
However, the coefficients of thermal expansion (CTE) of ReO₃-type materials range from strongly positive to strongly negative.
Through extensive use of in situ synchrotron diffraction, this thesis examines the thermal expansion of several ReO₃-type fluorides and oxyfluorides, demonstrating the effects on CTE and related properties of both cation and anion substitution and the disorder produced by these structural changes.
| Identifer | oai:union.ndltd.org:GATECH/oai:smartech.gatech.edu:1853/53000 |
| Date | 12 January 2015 |
| Creators | Morelock, Cody Reeves |
| Contributors | Wilkinson, Angus P. |
| Publisher | Georgia Institute of Technology |
| Source Sets | Georgia Tech Electronic Thesis and Dissertation Archive |
| Language | en_US |
| Detected Language | English |
| Type | Dissertation |
| Format | application/pdf |
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