Abstract
Abstract The magnetic properties of 8H-type hexagonal-type Ba(Na1/4Ru3/4)O3 having a 2D geometry of Ru5+(t2g3) ions were studied by magnetic-susceptibility measurements in the temperature range 5 K < T < 700 K. In this structure, the face-shared RuO6 octahedra form (Ru2O9)8− clusters with a 2D array, which are sandwiched by 2D layers of the NaO6 and the RuO6 corner-shared octahedra. The magnetic data show an antiferromagnetism-like behavior, and could be well fitted to a Curie-Weiss law above 520 K with μeff = 3.74 μB and θ = −1330 K. At a lower temperature range of 262 K < T < 520 K, it showed a reduced magnetic moment of μeff = 2.32 μB and θ = −221 K by a new Curie–Weiss law fit. The χ(T) behavior showed a strong external field dependence below 262 K, and magnetic anomaly peaks could be observed in low-field FC data at 30, 110, and 180 K, respectively. The magnetic properties of Ba(Na1/4Ru3/4)O3 are discussed concerning both a long-range 3D antiferromagnetic order and a spin-glass-like behavior.
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