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1
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Application of High Permittivity Bismuth Copper Titanate in Multilayer Capacitors

100%
Szwagierczak D., Kulawik J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
119-121
EN
A nonferroelectric high permittivity compound with the perovskite structure, Bi_{2/3}Cu_3Ti_4O_{12}, was synthesized at 900°C. The ceramic powder and appropriate organic additives were used for preparation of a slurry for tape casting. The obtained green tapes were smooth, flexible, and with a uniform thickness of 25 μm after drying at 50°C. Ag electrodes were screen printed on green rectangular sheets cut by a laser. Subsequent operations were screen printing of Ag internal electrodes, stacking of green sheets, isostatic lamination, cutting, deposition of external terminations and co-firing of dielectric and conductive layers at 850°C. Scanning electron microscopy observations showed well sintered, dense, fine-grained microstructure of ceramic layers and good cooperation with the electrodes made of commercial Ag paste. Capacitance and dissipation factor of multilayer capacitors were examined in the temperature range from - 55 to 330C at frequencies 10 Hz-2 MHz. The fabricated multilayer capacitors exhibit high capacitance and relatively low temperature coefficient of capacitance in the temperature range from - 55 to 110°C. The obtained lead-free high permittivity nonferroelectric material Bi_{2/3}Cu_3Ti_4O_{12} is a spontaneously formed internal barrier capacitor. This material seems to be a promising alternative for conventional lead-based relaxor dielectrics in multilayer ceramic capacitors.
2
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Investigations of properties of ceramic materials with perovskite structure in chosen electronic applications

81%
Kulawik J., Szwagierczak D., Gröger B.
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2007
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vol. 55
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issue 3
3
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Multiferroic Cobalt Ferrite-Lead Iron Tungstate Composites

81%
Kulawik J., Szwagierczak D., Guzdek P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
122-124
EN
The paper presents dielectric, magnetic and magnetoelectric properties of multiferroic bulk composites based on CoFe_2O_4 ferrite and Pb(Fe_{2/3}W_{1/3})O_3 relaxor. X-ray diffraction analysis and scanning electron microscopy observations of ceramic samples revealed two-phase composition and fine grained microstructure with uniformly distributed ferromagnetic and ferroelectric phases. Dielectric permittivity measured in a temperature range 218-773 K at frequencies of 10 Hz-2 MHz exhibits high and broad maxima attributed to dielectric relaxation. The hysteresis determined in a temperature range 4-393 K for magnetic field changing from - 80 kOe to 80 kOe is typical of hard magnetic materials. Saturation magnetizations and coercivities were found to decrease with increasing temperature. The courses of zero field cooled and field cooled magnetization versus temperature curves measured in the temperature range 4-393 K imply spin glass behavior of the ferrite and antiferromagnetic transition of the relaxor at low temperatures. The ferrite-relaxor composite shows high magnetoelectric voltage coefficient which distinctly increases with increasing frequency of ac magnetic field and is slightly higher for higher ac and dc magnetic fields.
4
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Multilayer Perovskite-Based Thermistors Fabricated by LTCC Technology

71%
Kulawik J., Szwagierczak D., Witek K., Skwarek A., Gröger B.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
436-438
EN
In this work, single-phase La_{0.7}Sr_{0.3}Zr_{0.5}Co^{2+}_{0.2}Co^{3+}_{0.3}O_3 and La_{0.8}Sr_{0.2}Ti_{0.5}Co^{2+}_{0.3}Co^{3+}_{0.2}O_3 ceramics with the stable perovskite structure were utilized for fabrication of multilayer negative temperature coefficient thermistors. The number and thicknesses of ceramic layers were adjusted to attain suitable resistances in a desired temperature range. Scanning electron microscopy studies revealed a dense, fine-grained microstructure of ceramic layers, lack of delaminations and cracks at ceramic layer-conductive layer boundaries and a good cooperation with conductive layers. The temperature coefficients of resistance of the fabricated multilayer thermistors were changing from - 13 to - 1%/K in the temperature range from - 55 to 400C.
5
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Structural, Electrical and Mössbauer Effect Studies of 0.5Bi rm_{0.95}Dy_{0.05}FeO_3-0.5Pb(Fe_{0.5}Nb_{0.5})O_3 Multiferroics

71%
Stoch A., Kulawik J., Stoch P., Maurin J., Zachariasz P.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1585-1590
EN
0.5Bi_{0.95}Dy_{0.05}FeO_3-0.5Pb(Fe_{0.5}Nb_{0.5})O_3 is a multiferroic material which exhibits ferroelectric and antiferromagnetic ordering. (The synthesis of such compounds is rather difficult.) In this paper the way of the synthesis of 0.5Bi_{0.95}Dy_{0.05}FeO_3-0.5Pb(Fe_{0.5}Nb_{0.5})O_3 is presented. The detailed X-ray and Mössbauer effect studies were done and crystal and hyperfine interaction parameters were obtained. To measure electrical properties of the compound the impedance spectroscopy measurements were performed. The obtained impedance spectra were fitted using a proposed equivalent electrical circuit and the results were discussed in the scope of the brick layer model without easy paths.
6
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Structural and Mössbauer Effect Studies of 0.5Bi_{0.95}Dy_{0.05}FeO_{3}-0.5Pb(Fe_{2/3}W_{1/3})O_{3} Multiferroic

71%
Stoch A., Zachariasz P., Stoch P., Kulawik J., Maurin J.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
59-61
EN
A polycrystalline ceramic of 0.5Bi_{0.95}Dy_{0.05}FeO_{3}-0.5Pb(Fe_{2/3}W_{1/3})O_{3} was synthesized from a solid-state reaction method. At room temperature material exhibits both magnetic and electric dipolar properties simultaneously. Detailed X-ray diffraction analysis and Mössbauer effect studies have been done to determine the crystallographic structure and magnetic properties of 0.5Bi_{0.95}Dy_{0.05}FeO_{3}-0.5Pb(Fe_{2/3}W_{1/3})O_{3}. T_{N} temperature was estimated at around 600 K.
7
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Structural and Mössbauer Effect Studies of 0.7Bi_{0.95}Dy_{0.05}FeO_3-0.3Pb(Fe_{0.5}Nb_{0.5})O_3 Multiferroic

71%
Stoch A., Kulawik J., Stoch P., Maurin J., Zachariasz P.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
56-58
EN
0.7Bi_{0.95}Dy_{0.05}FeO_{3}-0.3Pb(Fe_{0.5}Nb_{0.5})O_{3} is a multiferroic material which exhibits ferroelectric and antiferromagnetic ordering. In this paper the way of the synthesis of 0.7Bi_{0.95}Dy_{0.05}FeO_{3}-0.3Pb(Fe_{0.5}Nb_{0.5})O_{3} is presented. The detailed X-ray and Mössbauer effect studies were done and crystal and hyperfine interaction parameters were obtained.
8
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Magnetoelectric Properties of 0.3Bi_{0.95}Dy_{0.05}FeO_3-0.7Pb(Fe_{2/3}W_{1/3})O_3 Multiferroic

71%
Stoch A., Stoch P., Kulawik J., Zieliński P., Maurin J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
128-130
EN
Pb-based complex perovskites with Fe^{3+} like Pb(Fe_{2/3}W_{1/3})O_3 were found to be interesting because of their unique properties such as relaxor and magnetoelectric behavior. Pb(Fe_{2/3}W_{1/3})O_3 is ferroelectric with ferroelectric Curie temperature T_{C} between 150 and 200 K and at the same time is antiferromagnetic with magnetic Néel temperature about 400 K. BiFeO_3 is a well known perovskite compound which exhibits ferroelectric (T_{C} = 1103 K) and antiferromagnetic (T_{N} = 643 K) ordering simultaneously. The polycrystalline sample of 0.3Bi_{0.95}Dy_{0.05}FeO_3-0.7Pb(Fe_{2/3}W_{1/3})O_3 were synthesized using standard sintering procedure. Magnetization vs. magnetic field (at 4.2 K) curves were measured. Magnetoelectric properties of the sample were obtained.
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