Autor: Frąckowiak, J. E. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Theoretical and Mössbauer Effect Study of Magnetic and Electronic Properties of Fe$\text{}_{3}$Al Compound
Autorzy:: Deniszczyk, J.
Frąckowiak, J. E.
Powiązania:: https://bibliotekanauki.pl/articles/1956205.pdf
Data publikacji:: 1997-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Bb
75.10.Lp
Opis:: The electronic properties of Fe$\text{}_{3}$Al were determined experimentally, with the use of the Mossbauer spectroscopy, and theoretically. The band structure of the compounds was investigated applying the self-consistent tight-binding linear muffin tin orbital method. The calculated Fermi contact term of hyperfine fields and the isomer shifts are in good agreement with the values resulting from analysis of experimental data. The different kinds of electron transfer estimated on the base of the proposed "additive model" are also strongly supported by calculations.
Źródło:: Acta Physica Polonica A; 1997, 91, 2; 455-458
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Positron Annihilation Study of the Ageing Effects in the Cu-Zn-Sn Parent Phase
Autorzy:: Frąckowiak, J. E.
Płotkowski, K.
Salamon, A.
Powiązania:: https://bibliotekanauki.pl/articles/1933578.pdf
Data publikacji:: 1995-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.80.+y
61.72.-y
61.66.Dk
78.70.Bj
Opis:: A study of ageing effects on the structure of Cu-Zn-Sn shape memory alloys was performed using the $\text{}^{119}$Sn Mössbauer spectroscopy and positron annihilation techniques (the positron lifetime, and Doppler broadening line-shape S-parameter measurements). Two stages of ageing at 200°C connected with redistribution of Sn atoms were observed.
Źródło:: Acta Physica Polonica A; 1995, 88, 2; 327-332
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Positron Annihilation Lifetime in situ Study of Deformed Polyolefin Elastomers
Autorzy:: Krzemień, K.
Kansy, J.
Frąckowiak, J. E.
Powiązania:: https://bibliotekanauki.pl/articles/2043338.pdf
Data publikacji:: 2005-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
71.60.+z
61.41.+e
Opis:: The positron annihilation lifetime spectroscopy was used to investigate the free volume hole size of ethylene octane copolymers as a function of deformation in the range from 0 to 110% in steps of 10%. For each degree of deformation a series of 5-6 positron annihilation lifetime spectra was collected in situ. All spectra of a given series were analysed simultaneously. They were resolved into three exponential components, of lifetimes parameters τ$\text{}_{i}$ and intensities I$\text{}_{i}$. The variations of τ$\text{}_{3}$ reflect three deformation regions, the elastic range, strain softening range, and plastic region.
Źródło:: Acta Physica Polonica A; 2005, 107, 5; 837-841
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: 57Fe Mössbauer spectroscopy of annealed metamict davidite
Autorzy:: Malczewski, D.
Frąckowiak, J.
Galuskin, E.
Powiązania:: https://bibliotekanauki.pl/articles/148337.pdf
Data publikacji:: 2007
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: davidite
metamict minerals
recrystallization
Mössbauer spectroscopy
Opis:: This paper reports preliminary results of 57Fe Mössbauer spectroscopy and X-ray diffraction (XRD) studies of metamict davidite samples (La,Ce,Ca,Th)(Y,U,Fe)(Ti,Fe,Mn)20(O,OH)38 after high temperature annealing in an argon atmosphere. The Mössbauer spectra show a gradual decrease of quadrupole splitting and line width values of an Fe3+ doublet with increasing annealing temperature. Rather unexpected feature of these spectra for an Fe2+ doublet is a considerable increase of the line width with progressive crystallinity and a simultaneous decrease of both quadrupole splitting and isomer shift values. Changes of the hyperfine parameters as a function of the annealing temperature appeared as sensitive indicators of the thermal recrystallization process of metamict davidite similar to metamict silicates.
Źródło:: Nukleonika; 2007, 52, supl. 1; 81-84
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki