Abstract
The structural, magnetic, dielectric and optical properties of tungsten bronze Ba4Nd2Fe2-xNixNb8O30 (0 ≤ x ≤ 1) ceramics were investigated. The structural refinements indicate that all the samples exhibit the tetragonal structure with the space group of P4bm. Compared with the Ni-free sample with antiferromagnetic state, Ni-doped samples exhibit weak room-temperature ferromagnetic behavior. The sample x = 0.5 shows the largest magnetization with the remanent magnetization 2Mr of 0.13emu/g at 300 K, and its ferromagnetic transition temperature is much higher than room temperature. The observed ferromagnetism can be ascribed to the spin canting of Fe- and Ni-based sublattices via the Dzyaloshinskii-Moriya interaction. Dielectric spectra in anomaly region follows with Curie-Weiss law demonstrates that the nature of relaxor ferroelectrics, the dielectric loss relaxations can be interpreted in terms of Arrhenius law and Vogel-Fulcher relation. In addition, the sample Ba4Nd2Fe2Nb8O30 possesses a relatively narrow inter-direct optical band gap of 2.64eV.
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