Extended defects in insulating MgAl2O4 ceramic materials studied by PALS methods

Extended positron-trapping defects in technological modified insulating nanoporous MgAl2O4 ceramics are characterized by positron annihilation lifetime spectroscopy. The results are achieved using three-component fitting procedure with arbitrary lifetimes applied to treatment of measured spectra. Wi...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 15; no. 1; p. 012044
Main Authors Klym, H, Ingram, A, Shpotyuk, O, Filipecki, J, Hadzaman, I
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.11.2010
Subjects
Ceramics
Defects
Positron annihilation
Positronium
Service life assessment
Spectrum analysis
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Summary:Extended positron-trapping defects in technological modified insulating nanoporous MgAl2O4 ceramics are characterized by positron annihilation lifetime spectroscopy. The results are achieved using three-component fitting procedure with arbitrary lifetimes applied to treatment of measured spectra. Within this approach, the first component in the lifetime spectra reflects microstructure specificity of the spinel structure, the second component responsible to extended defects near intergranual boundaries and the third component correspond to ortho-positronium "pick-off" decaying in nanopores of ceramics. It is shown that in ceramics of different technological modifications the same type of positron traps prevails.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/15/1/012044