Abstract
In this work, we synthesized the Co–Ti-substituted barium ferrite materials (Ba(CoTi)1.22Fe9.56O19) by sol–gel method (S1) and solid-state method (S2). The phase formation, structural and magnetic properties of both samples were investigated separately. Differential scanning calorimeter and thermo-gravimetric analysis curves showed changes in energy and weight with respect to temperatures during the sintering process—from room temperature to 1200 °C at a rate of 10 °C per min. X-ray diffractometer patterns indicate that both samples, with Co–Ti ions substitution, had single phase of M-type barium ferrite, and no clear structural changes or formation of second phase was observed. Grain size and shape of samples were exhibited in SEM images, from which S1 showed more regular-shaped particles than S2. Magnetic hysteresis loops of the samples were measured using a vibrating sample magnetometer and showed similar saturation magnetization (M s) and coercivity (H c). M s and H c are mainly determined by electron magnetic moment, ion occupation and particle size. Microwave absorption properties of the samples were characterized by a microwave vector network analyzer in the frequency range of 0.5–18 GHz. In terms of complex magnetic permeability, dielectric permittivity, maximum reflection loss, resonance peak and bandwidth, there were remarkable differences between two samples. We suggested that these different characteristics originate from the variation in particles size, surface state and oxygen vacancies, which determined the interfacial polarization and related microwave absorption performance of the samples.
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Acknowledgments
The authors acknowledge the financial support provided by the Major State Basic Research Development Program of China (973 Program) (Grant No. 2012CB933100). J. Li acknowledges the scholarship support from the Chinese Scholarship Council.
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Zhang, D., Li, J., Zhang, H. et al. Ba(CoTi)1.22Fe9.56O19 ferrites prepared by sol–gel method and solid-state method techniques. Appl. Phys. A 122, 306 (2016). https://doi.org/10.1007/s00339-016-9845-9
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DOI: https://doi.org/10.1007/s00339-016-9845-9