0000000000335835

AUTHOR

R. Bujakiewicz-korońska

showing 3 related works from this author

Dielectric Properties of Na0.5K0.5(Nb1-xSbx)O3+MnO2 Ceramics (x = 0.04, 0.05 and 0.06)

2011

Lead-free ceramics Na0.5K0.5(Nb1-xSbx)O3+0.5mol%MnO2 (x = 0.04, 0.05 and 0.06) were prepared by conventional sintering and hot pressing process; their microstructure and dielectric properties have been studied. It is found that increase of sintering temperature promotes the obtaining highly dense microstructure and increase in grain size while doping with Sb contributes to more dense and homogeneous microstructure and smaller grain size. Low frequency (100 Hz-200 kHz) investigations revealed the diffuse phase transitions. It can be concluded from experimental results that Sb doping improves dielectric properties. The obtained materials are expected to be promising candidates for lead-free e…

Phase transitionMaterials scienceDopingMineralogySinteringDielectricCondensed Matter PhysicsHot pressingMicrostructureGrain sizeElectronic Optical and Magnetic MaterialsControl and Systems Engineeringvisual_artMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumCeramicElectrical and Electronic EngineeringComposite materialIntegrated Ferroelectrics
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Differential scanning calorimetry investigation of phase transition in $BaZr_{x}Ti_{1-x}O_{3}$

2009

ABSTRACT Lead-free BaZrxTi1-xO3 (x = 0; 0.025; 0.125) ceramics have been obtained by a conventional method. A single-phase perovskite structure of the ceramics was identified by the X-ray diffraction method. EDS analysis, performed for the individual grains of the tested sample, showed a good homogeneous distribution of all elements throughout the grains. The thermal behaviour of BaZrxTi1-xO3 (x = 0; 0.025; 0.125) ceramics was studied using the Differential Scanning Calorimetry (DSC). Measurements showed the influence of Zr addition on the character of phase transition in the BaTiO3 structure. The results were compared with these ones obtained for pure BaTiO3.

Diffractionstructural propertiesPhase transitionMaterials scienceAnalytical chemistryDielectricCondensed Matter PhysicsHomogeneous distributionElectronic Optical and Magnetic MaterialsDSCDifferential scanning calorimetrybarium-zirconium titanate $BaZr_{x}Ti_{1-x}O_{3}$ (BZT)Control and Systems Engineeringdielectric propertiesvisual_artThermalMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumCeramicElectrical and Electronic Engineering
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INFLUENCE OF ZIRCONIUM ON STRUCTURAL, MICROSTRUCTURAL AND FERROELECTRIC PROPERTIES OF BaZr0.20Ti0.80O3 CERAMIC

2009

ABSTRACT Barium zirconium titanate BaZrxTi1-xO3 ceramics have been obtained by conventional method. The X-ray diffraction analysis showed that the BaZr0.20Ti0.80O3 crystallizes in the cubic structure. The lattice parameter a increases with temperature, at temperature ∼308 K a small deviation is observed. The performed EDS study revealed that the samples were perfectly sintered and that the material was chemically homogeneous. It contains a little glassy phase and the grains are well shaped. The zirconium content (20 mol%) in the examined solid solution caused downward shift of the temperature T m . The increase of the achieved permittivity values ϵm was observed as well.

PermittivityZirconiumMaterials scienceAnalytical chemistrychemistry.chemical_elementBariumCondensed Matter PhysicsFerroelectricityElectronic Optical and Magnetic MaterialsCrystallographyLattice constantchemistryControl and Systems Engineeringvisual_artPhase (matter)Materials ChemistryCeramics and Compositesvisual_art.visual_art_mediumCeramicElectrical and Electronic EngineeringSolid solutionIntegrated Ferroelectrics
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