In the present study the effect of preparation conditions on microstructure and electrical properties of MgTiO3 ceramics was investigated. Mixture of MgO and TiO2 powders was subjected to mechanical activation for different time periods. Two types of sintering (two-step and HIP sintering) were performed on green bodies prepared by cold isostatic pressing. AC impedance spectroscopy in the low-frequency range (from 20 Hz to 1 MHz), at room and elevated temperatures, were performed in order to separate contribution of grains and grain boundaries to capacitance, resistance and conductivity of magnesium titanate ceramics. The special attention was directed to explanation of the influence of mechanical activation on electrical and morphological changes in sintered samples. The significant decrease of partial oxygen pressure in HP sintering atmosphere caused the change from insulating behavior of MgTiO3 samples after two-step sintering to semiconducting one.
Keywords:
AC impedance analysis / mechanical activation / SEM / titanate-based ceramics
Source:
Journal of Alloys and Compounds, 2017, 701, 107-115
TY - JOUR
AU - Filipović, Suzana
AU - Pavlović, Vera P.
AU - Obradović, Nina
AU - Paunović, V.
AU - Maca, Karel
AU - Pavlović, Vladimir B.
PY - 2017
UR - http://www.sciencedirect.com/science/article/pii/S0925838817301408
UR - https://dais.sanu.ac.rs/123456789/4691
AB - In the present study the effect of preparation conditions on microstructure and electrical properties of MgTiO3 ceramics was investigated. Mixture of MgO and TiO2 powders was subjected to mechanical activation for different time periods. Two types of sintering (two-step and HIP sintering) were performed on green bodies prepared by cold isostatic pressing. AC impedance spectroscopy in the low-frequency range (from 20 Hz to 1 MHz), at room and elevated temperatures, were performed in order to separate contribution of grains and grain boundaries to capacitance, resistance and conductivity of magnesium titanate ceramics. The special attention was directed to explanation of the influence of mechanical activation on electrical and morphological changes in sintered samples. The significant decrease of partial oxygen pressure in HP sintering atmosphere caused the change from insulating behavior of MgTiO3 samples after two-step sintering to semiconducting one.
PB - Elsevier
T2 - Journal of Alloys and Compounds
T1 - The impedance analysis of sintered MgTiO3 ceramics
SP - 107
EP - 115
VL - 701
DO - 10.1016/j.jallcom.2017.01.117
UR - https://hdl.handle.net/21.15107/rcub_dais_4691
ER -
@article{
author = "Filipović, Suzana and Pavlović, Vera P. and Obradović, Nina and Paunović, V. and Maca, Karel and Pavlović, Vladimir B.",
year = "2017",
abstract = "In the present study the effect of preparation conditions on microstructure and electrical properties of MgTiO3 ceramics was investigated. Mixture of MgO and TiO2 powders was subjected to mechanical activation for different time periods. Two types of sintering (two-step and HIP sintering) were performed on green bodies prepared by cold isostatic pressing. AC impedance spectroscopy in the low-frequency range (from 20 Hz to 1 MHz), at room and elevated temperatures, were performed in order to separate contribution of grains and grain boundaries to capacitance, resistance and conductivity of magnesium titanate ceramics. The special attention was directed to explanation of the influence of mechanical activation on electrical and morphological changes in sintered samples. The significant decrease of partial oxygen pressure in HP sintering atmosphere caused the change from insulating behavior of MgTiO3 samples after two-step sintering to semiconducting one.",
publisher = "Elsevier",
journal = "Journal of Alloys and Compounds",
title = "The impedance analysis of sintered MgTiO3 ceramics",
pages = "107-115",
volume = "701",
doi = "10.1016/j.jallcom.2017.01.117",
url = "https://hdl.handle.net/21.15107/rcub_dais_4691"
}
Filipović, S., Pavlović, V. P., Obradović, N., Paunović, V., Maca, K.,& Pavlović, V. B.. (2017). The impedance analysis of sintered MgTiO3 ceramics. in Journal of Alloys and Compounds
Elsevier., 701, 107-115.
https://doi.org/10.1016/j.jallcom.2017.01.117
https://hdl.handle.net/21.15107/rcub_dais_4691
Filipović S, Pavlović VP, Obradović N, Paunović V, Maca K, Pavlović VB. The impedance analysis of sintered MgTiO3 ceramics. in Journal of Alloys and Compounds. 2017;701:107-115.
doi:10.1016/j.jallcom.2017.01.117
https://hdl.handle.net/21.15107/rcub_dais_4691 .
Filipović, Suzana, Pavlović, Vera P., Obradović, Nina, Paunović, V., Maca, Karel, Pavlović, Vladimir B., "The impedance analysis of sintered MgTiO3 ceramics" in Journal of Alloys and Compounds, 701 (2017):107-115,
https://doi.org/10.1016/j.jallcom.2017.01.117 .,
https://hdl.handle.net/21.15107/rcub_dais_4691 .
