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1
Content available Influence of Calcium Ions on the Structure and Properties of LaMnO3
Bara M., Dzik J., Feliksik K., Kozielski L., Wodecka-Duś B., Goryczka T., Zarycka A., Adamczyk-Habrajska M.
Archives of Metallurgy and Materials
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2020
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Vol. 65, iss. 3
1189--1195
EN
La0,7 Ca0,3 MnO3 polycrystalline were synthesized from La2 O3 , CaO and MnO2 powder mixture using a solid state reaction technique. The compound powders were obtained through the free sintering method at different temperatures and sintering times in order to study the influence of technological conditions on Ca doped La manganites. The most important physical features as structure, microstructure and morphology were described after X-ray diffraction investigation. Photographs of the specimen fractures were taken with SEM (scanning electron microscope) and they revealed high porosity of the tested material and great tendency for its grains to create agglomerates. Influence of doping and technological conditions on lattice parameters were studied by means of Rietvield analysis. The XRD measurements reveal that La0,7 Ca0,3 MnO3 has orthorhombic symmetry with Pnma space group.
2
Content available Correlation Between Structure, Microstructure and Dielectric Properties of Bi7Fe3Ti3O21 Ceramics Obtained in Different Conditions
Szalbot D., Bartkowska J. A., Feliksik K., Bara M., Chrunik M., Adamczyk-Habrajska M.
Archives of Metallurgy and Materials
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2020
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Vol. 65, iss. 2
879--884
EN
Multiferroic six-layer Aurivillius type Bi7Fe3Ti3O21 ceramics was obtained by conventional mixed oxides method. The final sintering process was taken in several different sintering times, which determined changes in properties of discussed ceramic material. The structure and dielectric properties of the material are reported. In order to examine the technological conditions on the crystal structure, XRD analysis was carried out. The microstructure, as well as the quantitative and qualitative analysis of the chemical composition were investigated by scanning electron microscope with an energy dispersion spectrometer. The main purpose of the paper is to present the effect of sintering time on the microstructure, crystallographic structure and dielectric properties of Bi7Fe3Ti3O21 ceramics.
3
Content available remote Właściwości ceramiki BiFeO3 domieszkowanej dysprozem
Dzik J., Pikula T., Wodecka-Duś B., Feliksik K., Szalbot D., Szpara S.
Materiały Ceramiczne
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2018
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T. 70, nr 1
29--35
PL
Przedmiotem niniejszej pracy było otrzymanie i zbadanie podstawowych właściwości ceramiki Bi1-xAxFeO3 (A = Dy, dla x = 0, 0,03, 0,05, 0,07 i 0,1). Materiały otrzymano metodą reakcji w fazie stałej ze stechiometrycznych mieszanin tlenku bizmutu Bi2O3, tlenku żelaza Fe2O3 i tlenku dysprozu Dy2O3, stosując metodę spiekania bezciśnieniowego w atmosferze powietrza. Przеprоwаdzоnо bаdаniа struktury krystаlicznеj, mikrostruktury oraz właściwości magnetycznych otrzymanych materiałów.
EN
In the present research Bi1-xAxFeO3 (A = Dy, for x = 0, 0.03, 0.05, 0.07 and 0.1) ceramics was synthesized by the standard solid-state reaction method from the mixture of oxides. Ceramic powder obtained from the simple oxides Bi2O3, Fe2O3 and Dy2O3 using classical technology. The crystallographic structure, microstructure and magnetic properties of the obtained ceramic materials were studied.
4
Content available Influence of Dy Doping on the Properties of BiFeO3
Dzik J., Feliksik K., Pikula T., Panek R., Rerak M.
Archives of Metallurgy and Materials
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2018
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Vol. 63, iss. 3
1351--1355
EN
The aim of this research was to fabricate and study the properties of Bi1-x DyxFeO3 (for x = 0, 0.05, 0.07, 0.1) ceramics materials. Simple oxide powders Bi2O3, Dy2O3 and Fe2O3 were used to fabricate Bi1-xDyxFeO3 ceramics by mixed oxide method followed by free sintering. The study presents changes in microstructure and crystal structure as well as in dielectric properties and magnetic properties caused by modification of BiFeO3 with dysprosium dopant.
5
Content available Hot Pressed K0.5Na0.5NbO3 Material for Piezoelectric Transformer for Energy Harvesting
Kozielski L., Feliksik K., Wodecka-Duś B., Szalbot D., Tutu S.
Archives of Metallurgy and Materials
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2018
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Vol. 63, iss. 3
1275--1280
EN
An optimized method of vibration Energy Harvesting is based on a step-down transformer that regulates the power flow from the piezoelectric element to the desired electronic load. Taking into account parameters of the whole system, the “optimal” voltage gain the piezoelectric transformer can be determined where the harvested power is maximized for the actual level of mechanical excitation. Consequently the piezoelectric transformers can be used to boost up the conversion of mechanical strain into electrical power with considerable potential in Energy Harvesting applications. Nowadays however, the most important factor is usage of lead free material for its construction. Additional desired parameters of such ceramics include high value of piezoelectric coefficients, low dielectric losses and reasonable power density. This work for first time proposes a lead free K0.5Na0.5NbO3 (KNN) material implementation for stack type of piezoelectric transformer that is designed for load efficiency optimization of vibration energy harvester.
6
Content available remote Lead free Ba0.85Ca0.15TiO3 piezoelectric transformer for energy harvesting application
Kozielski L., Feliksik K., Wodecka-Duś B.
Materiały Ceramiczne
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2017
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T. 69, nr 2
68--72
EN
Piezoelectric Transformers are utilized to boost the conversion of mechanical vibration energy into electrical power with considerable potential in Energy Harvesting applications. Nowadays however, the critical challenge that need to be addressed is the use of lead free materials for their construction. The other requirements include the high conversion ratio, small size and reasonable power density. This work, for the first time, proposes implementation of the lead free Ba0.85Ca0.15TiO3 material for a piezoelectric transformer that is designed for a vibration energy collection device.
PL
Transformatory piezoelektryczne wykorzystywane są w celu zwiększenia efektywności konwersji energii drgań mechanicznych w energię elektryczną z dużym potencjałem w zastosowaniach do zbierania energii z otoczenia. Obecnie jednak kluczowe wyzwanie, które należy rozwiązać, polega na wykorzystaniu bezołowiowego, ceramicznego materiału piezoelektrycznego do jego budowy. Pozostałe wymagania obejmują wysoki współczynnik konwersji, mały rozmiar i rozsądną gęstość mocy. Praca ta po raz pierwszy proponuje zastosowanie bezołowiowej ceramiki Ba0.85Ca0.15TiO3 w transformatorze piezoelektrycznym, zaprojektowanym do urządzenia do zbierania energii wibracyjnej.
7
Content available PLZT microfibers technology optimization
Kozielski L., Adamczyk M., Feliksik K., Bochenek D., Clemens F.
Archives of Metallurgy and Materials
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2016
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Vol. 61, iss. 3
1471--1476
EN
Electrocaloric (EC) structures for a new generation of cooling or heating elements utilize the temperature dependence of spontaneous polarization in some ferroelectric materials to convert waste heat into electricity and vice versa. A (Pb0.93La0.07) (Zr0.65Ti0.35)O3 material, have the largest recorded pyroelectric coefficient. An effective predicted form for such applications is fiber, due to small heat capacitance and quick response time, even for nano second laser excitation. Consequently, the presented work provides a description of the optimization of structural, ferroelectric and piezoelectric properties of obtained fibers, finally concluding on necessity of sintering temperature reduction in 100°C in contrast to bulk form to effectively prevent its destruction.
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