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Instruments / Technical Area	Publication Details	Published	Actions
I11-High Resolution Powder Diffraction	Symmetry switching of negative thermal expansion by chemical control Mark Senn , Claire Murray , Xuan Luo , Lihai Wang , Fei-Ting Huang , Sang-Wook Cheong , Alessandro Bombardi , Chris Ablitt , Arash A. Mostofi , Nicholas C. Bristowe Journal Of The American Chemical Society DOI: 10.1021/jacs.5b13192 Diamond Proposal Number(s): [9677] Show Abstract ▼ 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 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.	Mar 2016

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