Symmetry Switching of Negative Thermal Expansion by Chemical Control

Senn, Mark S. and Murray, Claire A. and Luo, Xuan and Wang, Lihai and Huang, Fei-Ting and Cheong, Sang-Wook and Bombardi, Alessandro and Ablitt, Chris and Mostofi, Arash A. and Bristowe, Nicholas C. (2016) Symmetry Switching of Negative Thermal Expansion by Chemical Control. Journal of the American Chemical Society, 138 (17). pp. 5479-5482. ISSN 0002-7863. (doi: (Full text available)


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 maximized 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.

Item Type: Article
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QC Physics > QC176 Solid state physics
Q Science > QD Chemistry > QD478 Solid State Chemistry
Q Science > QD Chemistry > QD473 Physical properties in relation to structure
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Nicholas Bristowe
Date Deposited: 21 Feb 2017 16:43 UTC
Last Modified: 23 Feb 2017 09:41 UTC
Resource URI: (The current URI for this page, for reference purposes)
Bristowe, Nicholas C.:
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