The new phase 3C1:2‐Ba3NaRu2O9 was synthesized by heating the hexagonal perovskite 6H‐Ba3NaRu2O9 at 900 °C under a pressure of 9 GPa. 3C1:2‐Ba3NaRu2O9 adopts the 1:2 B site‐ordered cubic perovskite type structure [space group P3̄ m1, cell parameters a = 5.8068(3) and c = 7.0652(5) Å] but a significant cation inversion between Na and Ru sites is found. No magnetic ordering transition is observed down to 2 K and 3C1:2‐Ba3NaRu2O9 displays Pauli paramagnetism indicative of a metallic oxide with strong electron‐electron correlations.
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Arévalo‐López et al. (2014) studied this question.
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