http://hdl.handle.net/20.500.12128/8420
Tytuł: | Surface concentration of defects at grain boundaries in sintered alumina determined by positron annihilation lifetime spectroscopy |
Autor: | Kansy, Jerzy Ahmed, A. S. Liebault, J. Moya, G. |
Słowa kluczowe: | anihilacja pozytonu; spektroskopia |
Data wydania: | 2001 |
Źródło: | Acta Physica Polonica A, Vol. 100, nr 5 (2001), s. 737-742 |
Abstrakt: | Sintered alumina samples of grain diameters spanning from 1.2 to 4: 5 ñm have been investigated by positron annihilation lifetime spectroscopy. One series of samples was produced from material containing about 150 ppm impurities (mainly SiO 2 ). T he second one was made from material having about 2700 ppm of various elements (SiO 2 , MgO , CaO). Two models of positron trapping at grain boundari es are compared : The first one relates to the diffusion -limited regime ; and the other one - to the transition -limited regime of trapping. As a result the relative change of surface concentration of defects at grain boundarie s is determined. Additionally , the positron diffusion constant in bulk alumina at room temperature, D + = 0: 3 6 Ï 10 cm 2 /s, is estimated. |
URI: | http://hdl.handle.net/20.500.12128/8420 |
ISSN: | 0587-4246 |
Pojawia się w kolekcji: | Artykuły (WNŚiT) |
Plik | Opis | Rozmiar | Format | |
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Kansy_Surface_concentration_of_defects_at_grain.pdf | 411,82 kB | Adobe PDF | Przejrzyj / Otwórz |
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