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In situ powder X-ray and neutron diffraction showed that copper chromite retains its spinel structure (space group Fd3m, a = 8.348(3) ) in hydrogen at 320°C. The spinel has a copper ion deficiency and is stabilized by the dissolved hydrogen. Two hydrogen states are observed in the spinel structure: as specific hydrogen species H (16c interstitial position) and as OH groups with covalent bounding...
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