Abstract
Abstract The compound Co4Nb2O9 (CNO) exhibits interesting magnetoelectric coupling across its antiferromagnetic transition temperature (TN). Here, we report the structural, magnetic and complex dielectric properties of polycrystalline CNO within a wide temperature range (120–360 K), well above its TN. The temperature dependent dc magnetization reveals that TN ∼27.2 K. The isothermal magnetization results infer the magnetic field induced transition around 11 kOe at 5 K. The temperature dependent real part of complex dielectric behavior shows sharp increase around 160 K with frequency dispersion and a clear frequency dependent peak is observed in tanδ across the same temperature region. This feature corroborates the dielectric relaxation in CNO well above the long range magnetic ordering. Interestingly; the Curie-Weiss behavior of magnetization results deviate from linearity around the same temperature regime (∼160 K) which suggests the presence of short range magnetic correlation well above TN. The details impedance spectroscopy results are also analyzed to comprehend the grain and grain boundary contributions.
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