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Wyszukujesz frazę "Schneeweiss, O." wg kryterium: Autor


Wyświetlanie 1-8 z 8
Tytuł:
Magnetic Properties of γ-Fe₂O₃ Nanopowder Synthesized by Atmospheric Microwave Torch Dischargie. Acta Physica Polonica A 122, 9 (2012), ERRATUM
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Jašek, O.
Powiązania:
https://bibliotekanauki.pl/articles/1398694.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
99.10.Cd
Opis:
A nanopowder containing γ-Fe₂O₃ particles was synthesized by adding a gas mixture of H₂/Fe(CO)₅ into a microwave torch discharge at 1 bar. The presence of γ-Fe₂O₃ phase was confirmed by powder X-ray diffraction (mean crystallite size $d_{XRD}$=24 nm). The dominating characteristic sextets of γ-Fe₂O₃ were identified in the Mössbauer spectrum taken at 5 K. The presence of pure $Fe_3 O_4$ in the nanopowder was excluded. The Mössbauer spectrum taken at 5 K exhibited six times larger total spectrum area than the Mössbauer spectrum taken at 293 K. Zero field cooled/field cooled curves measured down to 4 K in the magnetic field of 7.9 kA/m are reported.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 168
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $γ-Fe_2O_3$ Nanopowder Synthesized by Atmospheric Microwave Torch Discharge
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Jašek, O.
Powiązania:
https://bibliotekanauki.pl/articles/1419658.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.50.Sw
81.07.Wx
76.80.+y
Opis:
A nanopowder containing $γ-Fe_2O_3$ particles was synthesized by adding a gas mixture of $H_2//Fe(CO)_5$ into a microwave torch discharge at 1 bar. The presence of $γ-Fe_2O_3$ phase was confirmed by powder X-ray diffraction (mean crystallite size $d_{XRD}$=24 nm). The dominating characteristic sextets of $γ-Fe_2O_3$ were identified in the Mössbauer spectrum taken at 5 K. The presence of pure $Fe_3O_4$ in the nanopowder was excluded. The Mössbauer spectrum taken at 5 K exhibited six times larger total spectrum area than the Mössbauer spectrum taken at 293 K. Zero field cooled/field cooled curves measured down to 4 K in the magnetic field of 7.9 kA/m are reported.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 9-11
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of $Ni_3Fe$ Nanoparticles Prepared by Chemical Method
Autorzy:
Zábranský, K.
Schneeweiss, O.
Pizůrová, N.
David, B.
Powiązania:
https://bibliotekanauki.pl/articles/1507208.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
61.46.-w
75.20.En
75.50.Bb
Opis:
$Ni_3Fe$ nanoparticles prepared by calcination of the iron-nickel oxalate were investigated by X-ray diffraction, Mössbauer spectroscopy and magnetic measurements. The high temperature X-ray diffraction shows two stages of transformation of oxalate: (i) amorphization and (ii) formation of nanocrystalline $Ni_3Fe$ particles. The development of coercivity, magnetization and mean coherence length ( ≈ particle size) is discussed.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 785-786
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Temperature Magnetic Properties of Nanocomposites Containing Superparamagnetic $Fe_3C$ Particles
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Morjan, I.
Powiązania:
https://bibliotekanauki.pl/articles/1507060.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
75.50.Bb
75.75.-c
Opis:
Two nanopowders containing superparamagnetic $Fe_3C$ particles, superparamagnetic $Fe_3O_4//γ-Fe_2O_3$ particles and carbon black phase were synthesised by the method of laser-induced homogeneous pyrolysis of gaseous precursors. Both were characterised by X-ray diffraction, Mössbauer spectrometry and standard magnetic measurements. The mean crystallite size of $Fe_3C$ was 3 nm for the first sample and 10 nm for the second sample. Mössbauer spectra measured at 27 K and zero-field cooled/field cooled curves measured down to 4 K are reported.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 766-767
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Temperature Magnetic Properties of Nanometric Fe-Based Particles
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Alexandrescu, R.
Morjan, I.
Powiązania:
https://bibliotekanauki.pl/articles/1813905.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.16.Mk
82.30.Lp
75.50.Bb
75.75.+a
61.05.Qr
Opis:
Fe-based nanoparticles were prepared by laser-driven pyrolysis. The as-synthesised powder consists ofα-Fe and $Fe_3O_4//γ-Fe_2O_3$ nanoparticles embedded in a pyrolytic carbon matrix. The crystallite size of 1.8 nm forα-Fe was calculated using the Scherrer formula. The as-synthesised nanopowder was superparamagnetic. The maximum of the zero-field cooling curve was observed at 32 K and the distribution of blocking temperatures $g(T_B)$ peaked at 11 K. As a result of small particle sizes and the soft matrix, the Lamb-Mössbauer factor f was significantly higher at 4 K than at 293 K.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 561-564
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties and Structure of Non-Oriented Electrical Steel Sheets after Different Shape Processing
Autorzy:
Bulín, T.
Švábenská, E.
Hapla, M.
Ondrůšek, Č.
Schneeweiss, O.
Powiązania:
https://bibliotekanauki.pl/articles/1032299.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ej
75.20.En
Opis:
Non-oriented electrical steel sheets are the most often used materials in electrical rotary machines. Raw sheets must be formatted by various methods, e.g., punching, laser, spark or water stream cutting. Basic parameters of magnetic, electrical, and mechanical properties of the sheets are usually obtained from the producer, but namely magnetic properties are changed in dependence on additional machining processes. The aim of this study is to describe changes in magnetic properties after punching, laser or spark cutting of the original sheets M470-50A. The basic information about the structure of the cut edges of samples was obtained by optical microscopy and scanning electron microscopy. For the magnetic measurements toroidal samples were prepared by the mentioned technologies. The magnetic parameters were yielded from the measuring of magnetic hysteresis loops in dependence on saturation fields. The results are discussed from the point of view of applied cutting methods with the aim to obtain the best magnetic parameters and consequently determining the depth of the influenced material. After laser cutting, important decrease in remanence and increase in total losses were observed in comparison with the punched samples.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 819-821
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocrystalline α-Fe Layer Examined by Mössbauer Spectrometry
Autorzy:
David, B.
Schneeweiss, O.
Pizúrová, N.
Rek, A.
Kudrle, V.
Jašek, O.
Powiązania:
https://bibliotekanauki.pl/articles/1381817.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.75.Hn
73.63.Bd
76.80.Pj
Opis:
A few micrometers thick nanocrystalline α-Fe layer with the mean crystallite size $d_{XRD}$=14 nm was deposited in low-pressure microwave plasma, using $Fe(CO)_{5}$ vapour. Its nanocrystalline character was proved on its surface under SEM (surface was formed of deposited nanoparticles) and in its volume using TEM (deposited nanoparticles were stacked up, creating columns). No significant iron oxide phases were observed in the transmission $\text{}^{57}Fe$ Mössbauer spectrum measured at 5 K nor in the surface-sensitive $\text{}^{57}Fe$ conversion electron Mössbauer spectrum measured at 293 K.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 94-95
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Interactions between Nanoparticles Formed during Calcination of Ferrihydrite
Autorzy:
Schneeweiss, O.
David, B.
Žák, T.
Filip, J.
Tuček, J.
Zbořil, R.
Mašláň, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506995.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Ck
75.20.En
Opis:
Magnetic interactions between nanoparticles of magnetite $Fe_3O_4$ and α-Fe formed during calcination of ferrihydrite in $H_2$ at temperatures 533 ÷ 713 K were studied. The detailed phase analysis describes evolution of contents of magnetite and α-Fe. Explanation of an anomalous course of magnetic moment characterized by a local maximum at an early stage of formation of nanoparticles is discussed.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 749-750
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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