Symmetry Switching of Negative Thermal Expansion by Chemical Control
File(s)
Supporting information
Published version
Author(s)
Type
Journal Article
Abstract
The layered perovskite Ca3-xSrxMn2O7 is shown to exhibit a switching from a material exhibiting uniaxial negative to positive thermal expansion as a function of x. The switching is shown to be related to two closely competing phases with different symmetries. The negative thermal expansion (NTE) effect is maximised when the solid solution is tuned closest to this region of phase space but is switched off suddenly on passing though the transition. Our results show for the first time that, by understanding the symmetry of the competing phases alone, one may achieve unprecedented chemical control of this unusual property.
Date Issued
2016-02-29
Date Acceptance
2016-02-29
Citation
Journal of the American Chemical Society, 2016, 138 (17), pp.5479-5482
ISSN
1520-5126
Publisher
American Chemical Society
Start Page
5479
End Page
5482
Journal / Book Title
Journal of the American Chemical Society
Volume
138
Issue
17
Copyright Statement
This is an open access article published under a Creative Commons Attribution (CC-BY)
License, which permits unrestricted use, distribution and reproduction in any medium,
provided the author and source are cited.
License, which permits unrestricted use, distribution and reproduction in any medium,
provided the author and source are cited.
License URL
Sponsor
Royal Commission for the Exhibition of 1851
Subjects
General Chemistry
03 Chemical Sciences
Publication Status
Published