Determination of the CTE tensor of materials from high temperature X-ray diffraction

Thermal expansion is historically reported as an average coefficient to estimate the change in dimensions of a material as it is heated or cooled. This average works well for approximating thermal expansion in high-symmetry crystals, but for low-symmetry crystals (monoclinic, triclinic), anisotropy in a system shows a deviation from averages. The Coefficient of Thermal Expansion Analysis Suite (CTEAS) has been developed to calculate and visualize thermal expansion properties of crystalline materials in three dimensions. The software can be used to determine the independent terms of the second rank thermal expansion tensor using hkl values, corresponding d-hkl listings, and lattice constants obtained from powder XRD patterns collected at different temperatures. Using CTEAS, a researcher can also visualize the anisotropy of this essential material property in three dimensions. In depth understanding of the thermal expansion of crystalline materials can be a useful tool in understanding the thermal properties of materials with temperature when correlated with the crystal structure.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Materials Science & Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2013

Author dc:creator

• Jones, Zachary

Contributors dc:contributor

• Kriven, Waltraud M.

• Thermal Expansion
• X-ray Diffraction

Statement dc:rights

• Copyright 2012 Zachary A. Jones

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/42211

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/42211