Abstract
The structure of Ag 2O has been studied between 5 and 300 K using both high resolution synchrotron X-ray and neutron powder diffraction methods. Ag 2O exhibits strong negative thermal expansion below 200 K and the cell volume is only weakly temperature dependent between 200 and 300 K. There is evidence for a first order phase transition below 35 K in Ag 2O and this is apparently related to displacive disorder of the Ag cations. This disorder contributes to the observed NTE.
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