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Thermal expansion, compressibility, and local structure of fluorides and oxyfluorides with the rhenium trioxide structure

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.

Identiferoai:union.ndltd.org:GATECH/oai:smartech.gatech.edu:1853/53000
Date12 January 2015
CreatorsMorelock, Cody Reeves
ContributorsWilkinson, Angus P.
PublisherGeorgia Institute of Technology
Source SetsGeorgia Tech Electronic Thesis and Dissertation Archive
Languageen_US
Detected LanguageEnglish
TypeDissertation
Formatapplication/pdf

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