Surface Concentration of Defects at Grain Boundaries in Sintered Alumina Determined by Positron Annihilation Lifetime Spectroscopy

• Authors: J. Kansy , A. Si Ahmed , J. Liebault , G. Moya
• Languages of publication: EN

Abstracts

EN

Sintered alumina samples of grain diameters spanning from 1.2 to 4.5μm have been investigated by positron annihilation lifetime spectroscopy. One series of samples was produced from material containing about 150 ppm impurities (mainly SiO_2). The second one was made from material having about 2700 ppm of various elements (SiO_2, MgO, CaO). Two models of positron trapping at grain boundaries 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 boundaries is determined. Additionally, the positron diffusion constant in bulk alumina at room temperature, D_+=0.36±10 cm^2/s, is estimated.

Keywords

EN

78.70.Bj; 77.84.Bw; 61.72.Mm

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 77.84.Bw: Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
• 61.72.Mm: Grain and twin boundaries

• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 100
• Issue: 5
• Pages: 737-742

Dates

published

2001-11

received

2001-05-14

Contributors

author

J. Kansy

• Institute of Physics and Chemistry of Metals, Silesian University, Bankowa 12, 40-007 Katowice, Poland

author

A. Si Ahmed

• Laboratoire Matériaux et Microélectronique de Provence, (U.M.R./CNRS nº 6137), Faculté des Sciences de St. Jérôme, Case 222, 13397 Marseille Cedex 20, France

author

J. Liebault

• Laboratoire Matériaux et Microélectronique de Provence, (U.M.R./CNRS nº 6137), Faculté des Sciences de St. Jérôme, Case 222, 13397 Marseille Cedex 20, France
• Ecole Nationale Supérieure des Mines de Saint-Etienne, Département Céramiques Spéciales, 42023 Saint-Etienne Cedex 2, France

author

G. Moya

• Laboratoire Matériaux et Microélectronique de Provence, (U.M.R./CNRS nº 6137), Faculté des Sciences de St. Jérôme, Case 222, 13397 Marseille Cedex 20, France

References

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Identifiers

DOI

10.12693/APhysPolA.100.737