Effective dielectric function of BaTiO.sub.3./sub.-NiO composites

0471346 - FZÚ 2017 RIV US eng C - Conference Paper (international conference)
Nuzhnyy, Dmitry - Petzelt, Jan - Bovtun, Viktor - Ostapchuk, Tetyana - Savinov, Maxim - Kempa, Martin - Bednyakov, Petr - Fernández-Garciá, L. - Rodriguez-Suarez, T. - Menendéz, J.L.
Effective dielectric function of BaTiO₃-NiO composites.
2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Application of Polar Dielectrics, and Piezoelectric Force Microscopy Workshop (ISAF/ECAPD/PFM). New York: IEEE, 2016 - (Deluca, M.), s. 1-4. ISBN 978-1-5090-1871-0.
[2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Application of Polar Dielectrics, and Piezoelectric Force Microscopy Workshop (ISAF/ECAPD/PFM). Darmstadt (DE), 21.08.2016-25.08.2016]
R&D Projects: GA ČR GA15-08389S
Institutional support: RVO:68378271
Keywords : ceramic composite * barium titanate * effective dielectric function * effective medium approximation * percolation
Subject RIV: BM - Solid Matter Physics ; Magnetism

Using spark plasma sintering we have processed and studied two ceramic composites of 70 vol% BaTiO3 (BTO) and 30 vol% NiO with standard and core-shell microstructure. Quantitative broadband dielectric spectroscopy up to the infrared range at 10-450 K showed substantial differences between both composites. The evaluated dielectric spectra revealing all three ferroelectric phase transitions were compared with modelled spectra using three different models based on effective medium approximation (Bruggeman, Lichtenecker and coated spheres). The results, including the soft-mode dynamics, were discussed using the concept of the BTO percolation.
Permanent Link: http://hdl.handle.net/11104/0268733