On the switching between negative and positive thermal expansion in framework materials

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Andrea Sanson
Abstract	The control of thermal expansion represents a challenge in materials design. This work shows that the length of the lattice parameter is a key element for controlling thermal expansion. By varying the lattice parameter through external pressure, chemical or other methods, the single-well potential energy of the polyhedra rotations (or of the atomic transverse vibrations) responsible for negative thermal expansion (NTE), can be turned into a quartic anharmonic potential or into a double-well potential, thus enhancing or suppressing the NTE, respectively. This result applied to framework materials should be taken into account to overcome the challenge of controlling thermal expansion.
Related Links	http://dx.doi.org/10.1080/21663831.2019.1621957
e-ISSN	21663831
DOI	10.1080/21663831.2019.1621957
Journal	Materials Research Letters
Issue Number	10
Volume Number	7
Language	English
Publisher	Taylor & Francis Group
Publisher Place	United Kingdom
Access Restriction	Open
Subject Keyword	Materials of Engineering and Construction. Mechanics of Materials Controlling Thermal Expansion Negative Thermal Expansion Framework Structures
Content Type	Text
Resource Type	Article