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Title: Surface concentration of defects at grain boundaries in sintered alumina determined by positron annihilation lifetime spectroscopy
Authors: Kansy, Jerzy
Ahmed, A. S.
Liebault, J.
Moya, G.
Keywords: anihilacja pozytonu; spektroskopia
Issue Date: 2001
Citation: Acta Physica Polonica A, Vol. 100, nr 5 (2001), s. 737-742
Abstract: 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.
ISSN: 0587-4246
Appears in Collections:Artykuły (WNŚiT)

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