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. 2018 Jan 31;19(1):44–52. doi: 10.1080/14686996.2017.1410055

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© 2018 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — The (a) side and the (b) top view of $2 \times 2 \times 4$ supercell of ${aTiO}_{2}$ . The (c) side and the (d) top view of 2 $\times$ 2 $\times$ 4 supercell of Fe(II)- ${aTiO}_{2}$ . Ti, O, Fe and O vacancy atoms are highlighted in grey, red, green, and blue, respectively.