Autor: Gorka, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Microstructural Study of Fe-Si(Ge)-Nb-Cu-B Finemet Alloys
Autorzy:: Michalik, S.
Bednarcik, J.
Brzózka, K.
Sovak, P.
Górka, B.
Powiązania:: https://bibliotekanauki.pl/articles/1534048.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.05.cp
61.05.C-
61.46.Hk
Opis:: Structural changes in Finemet based alloys invoked by germanium replacement for silicon were investigated using the X-ray diffraction, the X-ray absorption spectroscopy and the Mössbauer spectroscopy. Ge substitution preserves a nanostructural character of annealed samples at temperature 550°C; specifically the formation of a $DO_3$-type with about 19 at.% of (Si,Ge) was confirmed. The mean size of nanocrystals was estimated to be about 7 nm.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 818-819
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Comparison of Magnetic and Mössbauer Results Obtained for Palaeozoic Rocks of Hornsund, Southern Spitsbergen, Arctic
Autorzy:: Szlachta, K.
Michalski, K.
Brzózka, K.
Górka, B.
Gałązka-Friedman, J.
Powiązania:: https://bibliotekanauki.pl/articles/1811894.pdf
Data publikacji:: 2008-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 91.25.F-
Opis:: This analysis was performed as a part of the palaeomagnetic project focused on the reconstruction of the palaeogeographic position of the Svalbard Archipelago and adjacent crustal units (European Arctic) in the Palaeozoic and Mesozoic. Three rock formations - Cambrian, Devonian and Carboniferous were sampled in the area of Hornsund, southern Spitsbergen. The main aim of the presented study is to identify ferromagnetic minerals (sensu lato) - the carriers of the natural remanent magnetisation in the investigated rocks. A wide range of magnetic methods were used: the Lowrie tests, unblocking temperatures determinations and the measurement of coercivity spectra as well as the Mössbauer studies. In Devonian and Carboniferous samples all applied methods indicate the domination of the hematite natural remanent magnetisation carrier. In Cambrian rocks magnetic measurements reveal a mixture of ferromagnetic (sensu lato) minerals with varying coercivities and unblocking temperatures. The Mössbauer data improve the identification, suggesting that in Cambrian rocks the carrier of the dominating natural remanent magnetisation component is maghemite.
Źródło:: Acta Physica Polonica A; 2008, 114, 6; 1675-1682
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Finemet Thin Films Substituted by Chromium - CEMS and MOKE Study
Autorzy:: Brzózka, K.
Szumiata, T.
Sovák, P.
Górka, B.
Hibner, K.
Balcerski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1533968.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Bb
61.46.Hk
76.80.+y
78.20.Ls
Opis:: Conversion electron Mössbauer spectroscopy and magneto-optical Kerr effect were applied to investigate hyperfine interactions and macroscopic magnetic properties of Finemet-type thin films. Phase analysis as well as compositional evolution of hyperfine parameters and coercivity was performed in the range of chromium percentage 0 ≤ x ≤ 14. Essential differences in structure and hyperfine parameters were found for films of different chromium concentration. Coercivity shows non-monotonic dependence with minimal value at x = 5.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 794-796
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Hyperfine fields and magnetoelastic surface effects in Fe72Cu1.5Nb4Si13.5B9 nanocrystalline alloy
Autorzy:: Szumiata, T.
Gawroński, M.
Górka, B.
Brzózka, K.
Blázquez-Gámez, J.
Kulik, T.
Żuberek, R.
Ślawska-Waniewska, A.
Powiązania:: https://bibliotekanauki.pl/articles/148767.pdf
Data publikacji:: 2003
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: FINEMET
Mössbauer spectroscopy
nanocrystalline alloys
surface effects
surface magnetostriction
Opis:: In this work hyperfine fields of two-phase nanocrystalline Fe72Cu1.5Nb4Si13.5B9 alloys were studied in order to verify the existence of surface effects. To obtain a series of nanocrystalline samples with small grains of different sizes, a special non- -isothermal annealing procedure of an initially amorphous ribbon was applied. In the case of samples with a significant amount of crystallites, a high field (about 27.5 T) component of continuous part of the hyperfine field distribution was found that could be attributed to boundary regions between the grains and rest of the sample. The existence of the surface effects was confirmed in the magnetostrictive experiment.
Źródło:: Nukleonika; 2003, 48,suppl.1; 85-88
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Iron-containing phases in metallurgical and coke dusts as well as in bog iron ore
Autorzy:: Szumiata, T.
Rachwał, M.
Magiera, T.
Brzózka, K.
Gzik-Szumiata, M.
Gawroński, M.
Górka, B.
Kyzioł-Komosińska, J.
Powiązania:: https://bibliotekanauki.pl/articles/148303.pdf
Data publikacji:: 2017
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: metallurgical dusts
coke dusts
bog ore
phase analysis
Mössbauer spectrometry
magnetic susceptibility
Opis:: Several samples of dusts from steel and coke plants (collected mostly with electro filters) were subjected to the investigation of content of mineral phases in their particles. Additionally, sample of bog iron ore and metallurgical slurry was studied. Next, the magnetic susceptibility of all the samples was determined, and investigations of iron-containing phases were performed using transmission Mössbauer spectrometry. The values of mass-specific magnetic susceptibility varied in a wide range: from 59 to above 7000 × 10−8 m3kg−1. The low values are determined for bog iron ore, metallurgical slurry, and coke dusts. The extremely high was obtained for metallurgical dusts. The Mössbauer spectra and X-ray diffraction patterns point to the presence of the following phases containing iron: hematite and oxidized magnetite (in coke and metallurgical dusts as well as metallurgical slurry), traces of magnetite fi ne grains fraction (in metallurgical dusts), amorphous glassy silicates with paramagnetic Fe3+ and Fe2+ ions, traces of pyrrhotite (in coke dusts), α-Fe and nonstoichiometric wüstite (in metallurgical slurry), as well as ferrihydrite nanoparticles (in bog iron ore). For individual samples of metallurgical dusts, the relative contributions of Fe2+/3+ ions in octahedral B sites and Fe2+ ions in tetrahedral A sites in magnetite spinel structure differs considerably.
Źródło:: Nukleonika; 2017, 62, 2; 187-195
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Mössbauer study of vacuum annealed Fe100-xGax (10 less - than or equal to x less - than or equal to 35) thin films
Autorzy:: Szumiata, T.
Górka, B.
Brzózka, K.
Gawroński, M.
Gzik-Szumiata, M.
Javed, A.
Morley, N. A.
Gibbs, M. R. J.
Powiązania:: https://bibliotekanauki.pl/articles/147332.pdf
Data publikacji:: 2013
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: Fe-Ga
thin films
CEMS
MOKE
Opis:: This work reports results from comparative Mossbauer studies of as-deposited and annealed Fe100.xGax (10 less - than or equal to x less - than or equal to 35) high magnetostrictive thin films of constant thickness (50 plus or minus 2 nm). Films were grown on Si(100) substrates using a co-sputtering and evaporation chamber where Fe has been sputtered and Ga was evaporated. During growth of films, a magnetic field of 65 kA/m has been applied in the plane of the film. Annealed films have been obtained by heating in vacuum for 1 h at 350 centigrade without magnetic field. After annealing, the saturation field of the Fe-Ga films has been significantly reduced. By means of the 57Fe CEMS technique the contributions from several phases have been found: Fe-Ga A2 (bcc), traces of DO3 phase, a gallium-rich disordered phase and iron oxides (both geothite and magnetite). For the sample with x = 26.5 the heat treatment reduces the DO3 phase content whereas for the film with x = 16.4 the opposite tendency has been observed. Mossbauer results were compared with XRD and MOKE findings.
Źródło:: Nukleonika; 2013, 58, 1; 27-30
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Mössbauer and Magnetic Study of Fe+Vitroperm+Plastic System
Autorzy:: Brzózka, K.
Kollár, P.
Szumiata, T.
Sovak, P.
Füzer, J.
Fáberová, M.
Bureš, R.
Górka, B.
Gawroński, M.
Gzik-Szumiata, M.
Powiązania:: https://bibliotekanauki.pl/articles/1201075.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Bb
68.35.bd
76.80.+y
75.60.-d
72.80.Tm
Opis:: Phase composition and magnetization curves of the soft magnetic composites, fabricated by compaction of several kinds of powders mixed in various proportions, have been investigated by means of conversion electron Mössbauer spectroscopy and an alternating gradient force magnetometry. The results point to significant quantity of iron oxides - hematite and magnetite - at the surface of the samples. After the rubbing of thin surface layer, the relative content of oxides was distinctly reduced. Magnetic measurements revealed very similar characteristics of hysteresis curves for all the investigated materials.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 148-149
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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