AgScO2 Revisited: Synthesis, Crystal Structure Refinement and Properties of the 
Single-phase 3R Polymorph

Dietrich, V.; Jansen, M.

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AgScO₂ Revisited: Synthesis, Crystal Structure Refinement and Properties of the Single-phase 3R Polymorph

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Jansen, M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Dietrich, V., & Jansen, M. (2011). AgScO₂ Revisited: Synthesis, Crystal Structure Refinement and Properties of the Single-phase 3R Polymorph. Zeitschrift für Naturforschung B, 66(3), 227-229.

Cite as: https://hdl.handle.net/21.11116/0000-000E-BFF1-B

Abstract

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 (m) over barm, with a = 3.21092(2), c = 18.5398(1) angstrom 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 degrees C into Ag and Sc(2)O(3) with the release of oxygen. The conductivity of AgScO(2) increases gradually with temperature from 5.79 x 10(-18) to 7.94 x 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 degrees C.