Title:
Thermal expansion, compressibility, and local structure of fluorides and oxyfluorides with the rhenium trioxide structure
Thermal expansion, compressibility, and local structure of fluorides and oxyfluorides with the rhenium trioxide structure
Author(s)
Morelock, Cody Reeves
Advisor(s)
Wilkinson, Angus P.
Editor(s)
Collections
Supplementary to
Permanent Link
Abstract
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.
Sponsor
Date Issued
2014-08-12
Extent
Resource Type
Text
Resource Subtype
Dissertation