Supplementary Material for Strategies for the analysis of the elemental metal fraction of Ir and Ru oxides via XRD, XANES, and EXAFS Anita Hamar Reksten * Frode Seland Svein Sunde † Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU) NO-7491 Trondheim, Norway Andrea E. Russell and Peter W. Richardson Stephen J. Thompson Department of Chemistry, University of Southampton Southampton SO17 1BJ, England Karina Mathisen Department of Chemistry, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway May 28, 2019 S.1 Effect of strain on Rietveld refinements The Rietveld refinements may overestimate the metallic Ru fraction. For the ruthenium-rich samples, especially pure ruthenium, well described peak shapes in the refinements were not obtained. A super-Lorentzian contribu- tion to the peaks was seen which could not be included in the fit. There * Current address: SINTEF Sustainable Energy Technology, NO-0373 Oslo, Norway † Corresponding author. Tel.: +47 73594051; fax: +47 73591105, E-mail address: Svein.Sunde@material.ntnu.no 1 Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics. This journal is © the Owner Societies 2019