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