X-ray and dielectric characterization of Co doped tetragonal BaTiO3 ceramics |
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| Authors: | R Bujakiewicz-Koronska L Vasylechko E Markiewicz DM Nalecz A Kalvane |
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| Institution: | 1. Institute of Physics, Pedagogical University, Krakow, Polandsfbujaki@cyf-kr.edu.pl;3. Semiconductor Electronics Department, Lviv Polytechnic National University, Lviv, Ukraine;4. Institute of Molecular Physics, Polish Academy of Sciences, Poznan, Poland;5. Institute of Physics, Pedagogical University, Krakow, Poland;6. Institute of Solid State Physics, University of Latvia, Riga, Latvia |
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| Abstract: | ABSTRACTThe crystal structure modifications of BaTiO3 induced by cobalt doping were studied. The polycrystalline (1 ? x)BaTiO3 + xCo2O3 samples, with x ≤ 10 wt.%, were prepared by high temperature sintering conventional method. According to X-ray phase and structural characterization, performed by full-profile Rietveld refinement technique, all synthesized samples showed tetragonal symmetry perovskite structure with minor amount of parasitic phases. Pure single-phase composition has been detected only in the low level of doping BaTiO3. It was indicated that substitution of Co for the Ti sites in the (1 ? x)BaTiO3 + xCo2O3 series led to decrease of tetragonality (c/a) of the BaTiO3 perovskite structure. This effect almost vanished in the (1 ? x)BaTiO3 + xCo2O3 samples with nominal Co content higher than ～1 wt.%, in which precipitation of parasitic Co-containing phases CoO and Co2TiO4 has been observed. Based on the results, the solubility limit of Co in Ti sub-lattice in the (1 ? x)BaTiO3 + xCo2O3 series is estimated as x = 0.75 wt.%. |
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| Keywords: | Co doping barium titanate permittivity solubility limit |
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