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Magnetic Properties of Bismuth Ferrite Nanopowder Obtained by Mechanochemical Synthesis

100%
Szafraniak-Wiza I., Andrzejewski B., Hilczer B.
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vol. 126
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issue 4
1029-1031
EN
Multiferroic bismuth ferrite (BiFeO_{3}) nanopowders have been obtained at room temperature by mechanochemical synthesis. Depending on the post-synthesis processing the nanopowders exhibited differences in the mean sizes, presence of amorphous layer and/or secondary phases. Extended magnetic study performed for fresh, annealed and hot-pressed nanopowders revealed substantial improvement of the magnetic properties in the as-prepared powder.
2
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Electric Conductivity of (Bi_{1-x}La_{x}FeO_{3})_{0.5}(PbTiO_{3})_{0.5} Ceramics Obtained from Mechanosynthesized Nanopowders

100%
Markiewicz E., Hilczer B., Balcerzak M., Jurczyk M.
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vol. 126
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issue 4
971-974
EN
Electric conductivity of (Bi_{1-x}La_{x}FeO_{3})_{0.5}(PbTiO_{3})_{0.5} ceramics obtained from nanopowders synthesized by high-energy milling from respective oxides was studied in the frequency range 10 mHz ÷ 1 GHz. At room temperatures the low-frequency conductivity was found to be dominated by the contribution from poor-conducting grain boundaries, whereas the contribution in the range 1 kHz ÷ 1 MHz, due to the grain interior, was related by us to the small polaron hopping. Moreover, the electron exchange between ferric and ferrous ions activated at higher frequencies was found to be added to the conductivity above ≈ 1 MHz.
3
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Superionic Phase Transition in Rb_{4}LiH_{3}(SeO_{4})_{4} Single Crystals

100%
Połomska M., Hilczer B., Wolak J., Pietraszko A.
Acta Physica Polonica A
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1994
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vol. 85
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issue 5
825-833
EN
Derivatographic, dielectric and complex impedance studies of Rb_{4}LiH_{3}(SeO_{4})_{4} crystals revealed a superionic phase transition at T_{s} ≈ 448 K. The bulk conductivity rises from 10^{-6} to 10^{-4} (Ωm)^{-1} at T_{s}, and the activation energy of conductivity in the direction of crystal axes a and b (where a = b for tetragonal symmetry) W_{a} = W_{b} decreases from 0.94 eV in the low temperature phase to the value of 0.27 eV at T > T_{s}. The analysis of the results of X-ray studies at room temperature and at 450 K indicates that the fast ion transport, characterized by low activation energy, is related to the delocalization of the H2 protons in the O(12)-H2-O(24) bonds linking the Se(1)O_{4} and Se(2)O_{4} tetrahedra. The "cogwheel" mechanism is suggested to be involved in the fast proton transport.
4
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Studies of Fast Electron Irradiated Ferroelectric Poly(Vinylidene Fluoride)

100%
Goslar J., Hilczer B., Smogór H.
Acta Physica Polonica A
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2005
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vol. 108
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issue 1
89-94
EN
Radiation-induced functionalization of ferroelectric poly(vinylidene fluoride) was studied by ESR spectroscopy. The samples were irradiated in the high vacuum of a Van de Graaff accelerator with 1.0 MeV and 1.5 MeV electrons at room temperature and the decay of free radicals was studied after transferring the samples into the air. The samples exhibit a multicomponent ESR spectrum that can be decomposed into: a large asymmetric signal in the centre related to peroxy radicals, a quintet with hyperfine splitting A_F = 4.3 mT centred at g = 2.004, assigned to the in-chain radical (-CF_2-CH-CF_2-), and a triplet due to an end-chain (-CH_2) radical with A_H = 1.6 mT and g = 2.009.
5
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Magnetic Properties of YBCO-PST Composites

76%
Andrzejewski B., Kaczmarek A., Stankowski J., Hilczer B., Marfaing J., Régnier S., Caranoni C.
Acta Physica Polonica A
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2000
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vol. 98
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issue 6
739-746
EN
The magnetic properties of granular superconductor-insulator composites were investigated. The composites were random composition of the YBa_{2}Cu_{3}O_{7-δ} (YBCO) high-temperature superconductor and Pb(Sc_{0.5}Ta_{0.5})O_{3} (PST) ferroelectric insulator. The composites exhibited lower superconducting volume ratio than the YBCO content. For samples with YBCO content low enough no global (the whole sample) and local (separated grains) superconductivity was observed. The observed decay of the superconductivity, lowering of the critical temperature, and the increase in number of paramagnetic centres as PST content increases are explained assuming reaction among YBCO and PST phases and possible formation of an additional ones, which did not exist in the initial powders.
6
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High-Pressure Microwave Study of YBa_{2}Cu_{3}O_{7-δ}-Pb(Sc_{0.5}Ta_{0.5})O_{3} Composite

64%
Czyżak B., Stankowski J., Hilczer B., Krupski M., Morawski P., Andrzejewski B., Marfaing J., Régnier S., Caranoni C.
Acta Physica Polonica A
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1997
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vol. 91
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issue 6
1103-1109
EN
The ferroelectric relaxor Pb(Sc_{0.5}Ta_{0.5})O_{3}-superconductor YBa_{2}Cu_{3}O_{7-δ} 50% in weight composite exhibits the onset critical temperature T_{c}=95 K. High pressure studies yield the factor dT_{c}/dp of 1.0 K/GPa, close to the value observed for a pure YBa_{2}Cu_{3}O_{7-δ} compound. The microwave absorption studies show the significant role of the intergrain weak links.
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