Abstract
The influence of thermal treatment (750–950°C) on microstructure and electric properties of ferroelectric ceramics Bi4Ti3012 has been studied. The shape of monocrystalline grains undergoes changes upon thermal treatment as observed by optical microscopy. We have found that the modified dielectric properties of investigated samples are related to the grain shape transformation. The high value of dielectric permittivity and the appearence of hysteresis have been correlated to the presence of oxygen vacancies within the perovskite structure of Bi4Ti3012. The oxygen vacancies are preferentially sited in the vicinity of bismuth ions as evidenced by x-ray photoemission data. Variations in the valency state of.titanium ions are also possible. The XPS and AES measurements confirm that the surface elemental composition of Bi4Ti3012 ceramics does not deviate from the nominal bulk composition.
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Jovalekić, Č., Atanasoska, L., Petrović, V., Ristić, M.M. (1989). The Influence of Thermal Treatment on Polarization Behaviour of Bi4Ti3O12 Ceramics. In: Uskoković, D.P., Palmour, H., Spriggs, R.M. (eds) Science of Sintering. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0933-6_49
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DOI: https://doi.org/10.1007/978-1-4899-0933-6_49
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