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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Nečina, Vojtěch
University of Chemistry and Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2024Elastic properties and microstructure evolution of Zn2SnO4-spinel-containing composite ceramics based on tin oxide and zinc oxidecitations
- 2024Temperature dependence of Young's modulus and the occurrence of an elastic anomaly in porous alumina-mullite composites prepared by starch consolidation castingcitations
- 2023Highly textured 3D-printed translucent alumina through pressure-assisted sinteringcitations
- 2023The effect of LiF on preparation of transparent Eu:La2Zr2O7 ceramics by SPScitations
- 2023High-temperature mechanical behavior of partially sintered ceramicscitations
- 2022Magnesium fluoride (MgF2) – A novel sintering additive for the preparation of transparent YAG ceramics via SPScitations
- 2021Microstructure and Young's modulus evolution during re-sintering of partially sintered alumina-zirconia composites (ATZ ceramics)citations
- 2021Grain growth of MgAl2O4 ceramics with LiF and NaF additioncitations
- 2021Transparent MgAl2O4 spinel ceramics prepared via sinter-forgingcitations
- 2021PARTIALLY SINTERED LEAD-FREE CERAMICS FROM PIEZOELECTRIC POWDERS PREPARED VIA CONVENTIONAL FIRING AND SPARK PLASMA SINTERING (SPS) - CHARACTERIZATION OF MICROSTRUCTURE AND DIELECTRIC PROPERTIEScitations
- 2021Sintering aids, their role and behaviour in the production of transparent ceramicscitations
- 2020Influence of the heating rate on grain size of alumina ceramics prepared via spark plasma sintering (SPS)citations
- 2020Highly dense spinel ceramics with completely supressed grain growth prepared via SPS with NaF as a sintering additivecitations
- 2020Comparison of the effect of different alkali halides on the preparation of transparent MgAl2O4 spinel ceramics via spark plasma sintering (SPS)citations
- 2020Temperature dependence of Young's modulus and damping of partially sintered and dense zirconia ceramicscitations
Places of action
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article
PARTIALLY SINTERED LEAD-FREE CERAMICS FROM PIEZOELECTRIC POWDERS PREPARED VIA CONVENTIONAL FIRING AND SPARK PLASMA SINTERING (SPS) - CHARACTERIZATION OF MICROSTRUCTURE AND DIELECTRIC PROPERTIES
Abstract
This work deals with dielectric properties of lead-free ceramics from piezoelectric powders and focuses on the preparation and characterization of potassium-sodium niobate (K0.5Na0.5NbO3, KNN) and barium titanate (BaTiO3, BT) ceramics. Ceramic samples with different porosity were prepared from commercial KNN and BT powders by conventional firing in air or spark plasma sintering (SPS) at temperatures 600 - 1000 degrees C for KNN and 900 - 1300 degrees C for BT, resulting in partially or fully sintered microstructures. Bulk density, apparent density and open porosity were determined using the Archimedes method and closed and total porosities were calculated on the basis of theoretical densities. For both types of ceramics, the porosity decreases with increasing sintering temperature, and for identical temperatures the porosity of SPS samples is lower than for conventional firing, because the pressure applied during SPS promotes densification. For KNN the influence of SPS on the porosity is much larger than for BT. With increasing SPS temperature KNN exhibits a moderate decrease of the alkali content. The results of dielectric property measurements and their frequency dependence via impedance spectroscopy in the range from 10 or 100 Hz to 1 MHz show that the relative permittivity decreases in all cases with frequency and is usually higher for ceramics prepared via SPS than for conventional firing. This can be explained by the lower porosity and smaller grain size. The absolute values of the relative permittivity at 1 kHz are 134 - 532 (conventional firing) and 148 - 3780 (SPS) for KNN, and 753 - 1801 (conventional firing) and 923 - 10 380 (SPS) for BT ceramics.