Dielectric properties of strontium iron holmium niobate ceramics |
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Authors: | K. Sanjoom T. Tunkasiri K. Pengpat S. Eitssayeam G. Rujijanagul |
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Affiliation: | 1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;3. Thailand Center of Excellence in Physics, Commission on Higher Education, 328 Sri Ayutthaya Road, Bangkok 10400, Thailand |
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Abstract: | Strontium iron holmium niobate (Sr(Fe1?xHox)0.5Nb0.5O3) ceramics were synthesized via a solid-state reaction technique. The undoped ceramic showed an orthorhombic phase, but it transformed to a pseudocubic phase for higher Ho concentrations. A low solubility limit of Ho in SFN caused a formation of second phase for the x=0.15 ceramic. Dielectric behavior of undoped ceramic exhibited high dielectric constant over a wide temperature range. However, the doping shifted this region to a higher temperature. The doping also shifted the peak of dielectric loss to a higher temperature. Activation energy of dielectric relaxation increased with increasing Ho concentration. In addition, complex impedance analysis was applied to determine the behaviors of grain boundary and grain after doping. |
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