The effect of secondary abnormal grain growth on the dielectric properties of La/Mn co-doped BaTiO3 ceramics
La/Mn-codoped BaTiO3 systems, obtained by solid state reactions, were investigated regarding their microstructure characteristics and ferroelectric properties. Different concentrations of La2O3 were used for doping, ranging from 0.1 to 5.0 at% La, while a content of Mn was constant at 0.05 at%. For...
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International Institute for the Science of Sintering, Beograd
2006-01-01
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doaj-261c84a8f84c4bb8bf4a9e6224b2c8e42020-11-25T01:45:43ZengInternational Institute for the Science of Sintering, BeogradScience of Sintering0350-820X2006-01-0138327328110.2298/SOS0603273ZThe effect of secondary abnormal grain growth on the dielectric properties of La/Mn co-doped BaTiO3 ceramicsŽivković Lj.M.Paunović V.V.Stamenkov N.Lj.Miljković M.M.La/Mn-codoped BaTiO3 systems, obtained by solid state reactions, were investigated regarding their microstructure characteristics and ferroelectric properties. Different concentrations of La2O3 were used for doping, ranging from 0.1 to 5.0 at% La, while a content of Mn was constant at 0.05 at%. For all samples sintered below the eutectic temperature (1332°C), a uniform microstructure was formed with average grain size from 1-3 μm. The appearance of secondary abnormal grains with (111) double twins grains with curved or faceted grain boundaries were observed in La/Mn BaTiO3 ceramics after sintering at temperatures above the eutectic temperature. All sintered samples exhibited a high electrical resistivity. Better dielectric performances were obtained for low doped samples (0.1 at% La) sintered at 1350°C. For samples with La content above 1.0 at% a lower value in dielectric permittivity at higher sintering temperature is due to secondary abnormal grain growth, and to the presence of a non-ferroelectric phase rich in La. The Curie constant together with other dielectric parameters were also calculated. http://www.doiserbia.nb.rs/img/doi/0350-820X/2006/0350-820X0603273Z.pdfLa-doped BaTiO3microstructuregrain growthdomainsdielectric constant |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Živković Lj.M. Paunović V.V. Stamenkov N.Lj. Miljković M.M. |
spellingShingle |
Živković Lj.M. Paunović V.V. Stamenkov N.Lj. Miljković M.M. The effect of secondary abnormal grain growth on the dielectric properties of La/Mn co-doped BaTiO3 ceramics Science of Sintering La-doped BaTiO3 microstructure grain growth domains dielectric constant |
author_facet |
Živković Lj.M. Paunović V.V. Stamenkov N.Lj. Miljković M.M. |
author_sort |
Živković Lj.M. |
title |
The effect of secondary abnormal grain growth on the dielectric properties of La/Mn co-doped BaTiO3 ceramics |
title_short |
The effect of secondary abnormal grain growth on the dielectric properties of La/Mn co-doped BaTiO3 ceramics |
title_full |
The effect of secondary abnormal grain growth on the dielectric properties of La/Mn co-doped BaTiO3 ceramics |
title_fullStr |
The effect of secondary abnormal grain growth on the dielectric properties of La/Mn co-doped BaTiO3 ceramics |
title_full_unstemmed |
The effect of secondary abnormal grain growth on the dielectric properties of La/Mn co-doped BaTiO3 ceramics |
title_sort |
effect of secondary abnormal grain growth on the dielectric properties of la/mn co-doped batio3 ceramics |
publisher |
International Institute for the Science of Sintering, Beograd |
series |
Science of Sintering |
issn |
0350-820X |
publishDate |
2006-01-01 |
description |
La/Mn-codoped BaTiO3 systems, obtained by solid state reactions, were investigated regarding their microstructure characteristics and ferroelectric properties. Different concentrations of La2O3 were used for doping, ranging from 0.1 to 5.0 at% La, while a content of Mn was constant at 0.05 at%. For all samples sintered below the eutectic temperature (1332°C), a uniform microstructure was formed with average grain size from 1-3 μm. The appearance of secondary abnormal grains with (111) double twins grains with curved or faceted grain boundaries were observed in La/Mn BaTiO3 ceramics after sintering at temperatures above the eutectic temperature. All sintered samples exhibited a high electrical resistivity. Better dielectric performances were obtained for low doped samples (0.1 at% La) sintered at 1350°C. For samples with La content above 1.0 at% a lower value in dielectric permittivity at higher sintering temperature is due to secondary abnormal grain growth, and to the presence of a non-ferroelectric phase rich in La. The Curie constant together with other dielectric parameters were also calculated. |
topic |
La-doped BaTiO3 microstructure grain growth domains dielectric constant |
url |
http://www.doiserbia.nb.rs/img/doi/0350-820X/2006/0350-820X0603273Z.pdf |
work_keys_str_mv |
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