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. 2015 Apr 24;6:6954. doi: 10.1038/ncomms7954

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(a) MSD at 1,200, 1,500, 1,800, 2,400 and 2,700 K. (b) Arrhenius plot of diffusion coefficients, from which the Na⁺ ion migration energy barrier of 0.35 eV is obtained. (c) Trajectories (small grey bullets) of Na⁺ ion in FPMD simulations at 1,800 K from 5 to 8 ps in P2-Na_0.6[Cr_0.6Ti_0.4]O₂, the top view of each Na⁺ layer is given in the right panel. The initial positions of Na1 (yellow), Na2 (orange), Cr (blue), Ti (light blue) and O (red) are shown for clarity.