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Wyświetlanie 1-3 z 3
Tytuł:
Vacancy-Fluorine Clusters in Silicon
Autorzy:
Chroneos, A.
Vovk, R.
Goulatis, I.
Nazyrov, Z.
Pinto Simoes, V.
Januszczyk, M.
Latosińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1504564.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.es
61.72.jd
61.72.uf
61.72.Yx
Opis:
Fluorine (F) doping and the formation of F-vacancy $(F_{n}V_{m})$ clusters have been extensively studied in silicon (Si) as they can suppress the transient self-interstitial mediated diffusion of boron (B). Recent experimental studies by Bernardi et al. revealed that there is no significant concentration of $F_{n}V_{m}$ clusters (for n ≥ 4, m ≥ 1) in disagreement with a number of density functional theory studies. In the present study we use electronic structure calculations to evaluate the binding energies of $F_{n}V_{m}$ clusters and $V_{n}$ clusters. The significant binding energies of the $V_{n}$ clusters reveals that the concentration of the large $F_{n}V_{m}$ clusters (n ≥4, m ≥1) will be limited compared to the $V_{n}$ clusters or even smaller clusters.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 774-777
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-Component Density Functional Study of Positron-Vacancy Interaction in Metals and Semiconductors
Autorzy:
Ishibashi, S.
Powiązania:
https://bibliotekanauki.pl/articles/1033953.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.60.+z
78.70.Bj
61.72.jd
Opis:
The positron-vacancy interaction in metals and semiconductors has been studied by the two-component density-functional-theory formalism. If a positron is not trapped at the vacancy, atoms surrounding the vacancy show inward relaxation for most cases except for nitrides, where outward relaxation is observed. The presence of positron suppresses the inward relaxation. Positron lifetimes have been calculated with and without the positron effect. The difference between two lifetime values is investigated in relation to the bulk modulus.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1602-1605
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eu-Doped Cerium Oxide Nanoparticles Studied by Positron Annihilation
Autorzy:
Thorat, A.
Ghoshal, T.
Morris, M.
Nambissan, P.
Powiązania:
https://bibliotekanauki.pl/articles/1338100.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.Df
78.20.Ci
61.72.jd
12.38.Aw
78.70.Bj
Opis:
The defect characteristics of cerium oxide ($CeO_2$) nanoparticles prepared through a solvothermal process and doped by europium to different concentrations ([Eu] = 0, 0.1, 0.5, 1, ..., 50 wt%) were studied by positron lifetime and coincidence Doppler broadening measurements. The particle sizes estimated from X-ray diffraction showed a reducing trend with increasing doping concentration except an increase during [Eu] = 0.1-1 wt%. The latter effect is attributed to the reduction of $Ce^{4+}$ ions to $Ce^{3+}$ resulting into the release of vacancies and formation of $Ce^{3+}$-vacancy associates. The lattice parameter increased with the decrease in particle size. Quantum confinement effects were observed in optical absorption studies as increase of band gap in particles of sizes below 7-8 nm. The vacancy-type defects were investigated by positrons. A lifetime of 176 ± 4 ps less than 187-189 ps reported for positrons in bulk $CeO_2$ reveals trapping of positrons in vacancy-type defects within the nanocrystallites. The defect-specific positron lifetime is admixed with that at the crystallite surfaces and it increased due to vacancy agglomeration at higher doping concentrations. Coincidence Doppler broadening studies indicated positron annihilation in defects surrounded by oxygen ions and the S-W plot showed the effect of quantum confinement through a peak-like kink or shoulder in the plot. Optical absorption studies have supported this observation.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 756-759
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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