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Silver scandium oxide AgScO 2  has been obtained from Ag 2 O and Sc 2 O 3  by solid-state reaction at elevated temperature and under high oxygen pressure in stainless-steel autoclaves. AgScO 2  was obtained in the 3R Delafossite-type structure, R¯3m, with a = 3.21092(2), c = 18.5398(1) Å and Z = 3, containing virtually no admixtures of the 2H polytype. The fully ordered structure was solved by high-resolution X-ray powder diffraction data, R(F 2 ) = 0.0436, 30 parameters. AgScO 2  decomposes at around 740 ºC into Ag and Sc 2 O3 with the release of oxygen. The conductivity of AgScO 2  increases gradually with temperature from 5.79 × 10 −18  to 7.94 × 10 −10  S cm −1 , and is ionic in nature, the activation energy for ion conduction being 75 kJ mol −1  in the temperature range from 250 to 425 ºC.

AgScO 2 Revisited: Synthesis, Crystal Structure Refinement and Properties of the Single-phase 3R Polymorph