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Wyświetlanie 1-3 z 3
Tytuł:
Magnetic Susceptibility Disaccommodation and Mössbauer Effect in Microcrystalline Fe-Si Ribbons
Autorzy:
Ciurzyńska, W. H.
Powiązania:
https://bibliotekanauki.pl/articles/2013343.pdf
Data publikacji:
2000-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Lr
76.80.+y
Opis:
The magnetic susceptibility disaccommodation of the microcrystalline Fe-xSi (x=3, 5, 6.5, and 7.2 wt%) ribbons in the as-quenched state and after annealing at 1370 K for 1 h was investigated in the temperature range from 220 to 410 K. Simultaneously, the microstructure of those samples was studied using the Mössbauer spectroscopy. It is found that the isochronal disaccommodation curves may be decomposed into five elementary processes. Taking into account the results obtained from the Mössbauer spectra analysis, the relaxational process with activation energy equal to 0.84 eV may be considered as the Snoek relaxation. However, the relaxational processes of higher activation energy seem to be connected with jumps of C atoms in the vicinity of Fe atoms surrounded by 1, 2, 3, and 4 silicon atoms.
Źródło:
Acta Physica Polonica A; 2000, 97, 4; 719-728
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure studies of amorphous and nanocrystalline (Fe1-xCox)85.4Zr6.8-yMyB6.8Cu1 (x = 0 or 0.1, y = 0 or 1, M = Mo, Nb or Nd) alloys
Autorzy:
Olszewski, J.
Zbroszczyk, J.
Fukunaga, H.
Ciurzyńska, W.
Świerczek, J.
Hasiak, M.
Perduta, K.
Łukiewska, A.
Młyńczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/147229.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Invar effect
nanocrystalline alloys
interfacial zone
Opis:
The amorphous and nanocrystalline (Fe1 xCox)85.4Zr6.8 yMyB6.8Cu1 (x = 0 or 0.1, y = 0 or 1, M = Mo, Nb or Nd) alloys were studied using Mössbauer spectroscopy. We have stated that after the low temperature annealing of the samples the decrease of the average hyperfine field due to the Invar effect was observed. This effect is associated with the increase of atom packing density after the annealing of the samples, which may lead to the noncolinear spin state in some regions. This phenomenon was completely suppressed after substitution of 10% of Fe atoms by Co atoms. At early stages of crystallization of the Fe85.4Zr6.8 yMyB6.8Cu1 (y = 0 or 1, M = Mo, Nb or Nd) alloys, the interfacial zone is poor in iron due to diffusion of Zr, B, Nb, Mo and Nd atoms outside regions where á-Fe fine grains are created. However, the iron content in the amorphous matrix is the same as in the as-quenched state. The iron concentration in the interfacial zone of the nanocrystalline alloys obtained by the accumulative annealing depends on the chemical composition of the as-quenched samples. In the nanocrystalline samples obtained by two-step annealing, the iron content in the interfacial layer is higher than in the amorphous matrix.
Źródło:
Nukleonika; 2004, 49,suppl.3; 79-83
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocrystallization studies of rapidly quenched Fe85.4-xCoxZr6.8-yNbyB6.8Cu1 (x = 0 or 42.7, y = 0 or 1) alloys
Autorzy:
Olszewski, J.
Zbroszczyk, J.
Ciurzyńska, W.
Fukunaga, H.
Wysłocki, B.
Perduta, K.
Łukiewska, A.
Młyńczyk, A.
Lelątko, J.
Świerczek, J.
Powiązania:
https://bibliotekanauki.pl/articles/148787.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer spectra
nanocrystalline Fe-Co alloys
Opis:
The microstructure of amorphous and nanocrystalline Fe42.7Co42.7Zr6.8-xNbxB6.8Cu1 (x = 0 or 1) alloys was investigated. We have stated that the nanocrystalline samples consist of the crystalline alfa-FeCo grains about 8 nm in diameter embedded in an amorphous matrix which is rich in cobalt. From Mössbauer spectroscopy studies we have found that the crystalline alfa-FeCo phase in the nanocrystalline samples obtained by the conventional annealing is atomically ordered. Moreover, the order degree depends on the annealing time. As for the samples partially crystallized during rapid quenching, the crystalline alfa-FeCo phase is atomically disordered.
Źródło:
Nukleonika; 2003, 48,suppl.1; 49-52
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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