On AgRhO2, and the new quaternary delafossites AgLi1/3M2/3O2, syntheses and 
analyses of real structures

Todorova, V.; Leineweber, A.; Kienle, L.; Duppel, V.; Jansen, M.

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On AgRhO₂, and the new quaternary delafossites AgLi_1/3M_2/3O₂, syntheses and analyses of real structures

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Kienle, L.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

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Duppel, V.
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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

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Todorova, V., Leineweber, A., Kienle, L., Duppel, V., & Jansen, M. (2011). On AgRhO₂, and the new quaternary delafossites AgLi_1/3M_2/3O₂, syntheses and analyses of real structures. Journal of Solid State Chemistry, 184(5), 1112-1119.

Cite as: https://hdl.handle.net/21.11116/0000-000E-BE85-6

Abstract

Two new quaternary delafossite type oxides with the general formula Ag(Li(1/3)M(2/3))O(2), M = Rh, Ir, have been synthesized, and their structures characterized. Based on X-ray and electron diffraction analyses the structural similarity with AgRhO(2) delafossite, has been evidenced. The real structures of the quaternary delafossites have been revealed, which has allowed to fully explain the diffuse scattering as observed in X-ray powder diffraction. AgRhO(2) is thermally stable up to 1173 K, the behavior of the two quaternary compounds AgLi(1/3)Rh(2/3)O(2) and AgLi(1/3)Ir(2/3)O(2) is comparable, and they decompose above 950 and 800 K. respectively. AgRhO(2) shows temperature independent paramagnetism, while for the other two an effective magnetic moment of 1.77 mu(B) for Ir, and 1.70 mu(B) for Rh were determined, applying the Curie-Weiss law. All compounds are semiconducting with activation energies of 4.97 kJ mol(-1) (AgLi(1/3)Rh(2/3)O(2)), 11.42 kJ mol(-1) (AgLi(1/3)Ir(2/3)O(2)) and 17.58 kJ mol(-1) (AgRhO(2)). (C) 2011 Elsevier Inc. All rights reserved.