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. 2019 May 14;7:335. doi: 10.3389/fchem.2019.00335

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Copyright © 2019 Zhang, Zhang and Huang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(a) SEM images of Na_0.67Mn_0.5Fe_0.5O₂ after 1 day air-exposure, (b) Na_0.67Mn_0.5Fe_0.5O₂ after a couple of weeks' air-exposure, (c) Na_0.67Mn_0.5Fe_0.5O₂ after a couple of months' air-exposure, (d) XRD patterns of Na_0.67Mn_0.5Fe_0.5O₂ samples under different air-exposure time, (e) Nuclear Fourier difference map of Na_0.67Mn_0.5Fe_0.5O₂, (f) The local environment of CO, (g) The nuclear density around the carbon element position. Reproduced with permission (Duffort et al., 2015). Copyright 2015, American Chemical Society.