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Powder neutron diffraction data were obtained from 30 to 600K for CuAlO 2 , CuInO 2 , CuLaO 2 , 2H CuScO 2 , 3R CuScO 2 , and AgInO 2 . Rietveld refinements of these data showed negative thermal expansion (NTE) of the O–Cu–O linkage in all cases. This behavior was especially strong for CuLaO 2 and CuScO 2 , where it persisted up to our...