@ARTICLE{Bartkowska_J.A._Dielectric_2019, author={Bartkowska, J.A. and Bochenek, D.}, volume={vol. 64}, number={No 1}, journal={Archives of Metallurgy and Materials}, pages={221-225}, howpublished={online}, year={2019}, publisher={Institute of Metallurgy and Materials Science of Polish Academy of Sciences}, publisher={Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences}, abstract={The five-layer Aurivillius type structures with the general chemical formula Bi5Fe2-xMnxTi3O18, where x = 0, 0.6, 1.2 have been synthesized and tested. The SEM studies showed a significant increase in grain size in the manganese-modified Aurivillius type ceramic material (for x = 1.2). The increase in the amount of manganese ions (Mn3+) affects the decrease in the temperature at which the relaxation processes take place. Namely from 525 K (1 kHz) and 725 K (1 MHz) for BFT sample (x = 0) to 355 K (1 kHz) and 565 K (1 MHz) for BFM12T sample (x = 1.2). Using the Arrhenius’s law and the Vogel-Fulcher’s relationship the activation energy (Ea) and the relaxation time have been calculated. The value of Ea increases with the increase of the Mn amount from 0.737 eV (for x = 0) to 0.915 eV (for x = 1.2).}, type={Artykuły / Articles}, title={Dielectric relaxation of manganese modified Bi6Fe2Ti3O18 aurivillius type ceramics}, URL={http://journals.pan.pl/Content/110154/PDF/AMM-2019-1-32-Bartkowska.pdf}, doi={10.24425/amm.2019.126241}, keywords={activation energy, Aurivillius phase, dielectric constant, dielectric relaxation, Vogel-Fulcher law}, }