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. 2018 Jun 6;5(6):171811. doi: 10.1098/rsos.171811

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© 2018 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 8. — EIS spectra (the frequencies of 0.1 Hz and 1 Hz are marked by filled symbols) for undoped TiO₂, Ti_0.99Hf_0.01O₂, Ti_0.97Hf_0.03O₂ and Ti_0.95Hf_0.05O₂ electrodes fitted (solid lines) with equivalent circuits (inset).