Different Local Structures of Mo and Nb Polyhedra in the Oxide-Ion-Conducting Hexagonal Perovskite-Related Oxide Ba<sub>3</sub>MoNbO<sub>8.5</sub> Revealed by <sup>95</sup>Mo and <sup>93</sup>Nb NMR Measurements
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Hidden chemical order in disordered Ba7Nb4MoO20 revealed by resonant X-ray diffraction and solid-state NMR