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Formation and Annealing of Micropores in Hematite

100%
Dauwe C., Da Costa G. M., Van Hoecke T., Segers D.
Acta Physica Polonica A
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1995
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vol. 88
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issue 1
119-123
EN
In iron oxide powders positrons are trapped in the surface layers and the value of the S-parameter is an indicator of the total specific surface, including external surface and internal surfaces of micropores. The evolution of micropores is followed when α-FeOOH is thermally decomposed into α-Fe_{2}O_{3}. It is shown that the micropore formation is not linked to the decomposition process, but that they also form in hematite synthesized from a ferrihydrite precursor in aqueous solution.
2
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Experimental Verification of the Blob Model and Delayed Formation of Ps

100%
Dauwe C., Van Waeyenberge B., De Baerdemaeker J.
Acta Physica Polonica A
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2005
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vol. 107
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issue 4
623-628
EN
Stepanov and Byakov's blob model for the formation of positronium can be considered as an extension of the spur model. However, it offers many extra possibilities and is more sound from the radiation chemistry point of view. A full coding of this model leads to non-exponential lifetime spectra, and standard multi-component analysis is no longer adequate for materials such as polymers. Age momentum correlation experiments were performed on linear PMMA at different temperatures and were analyzed with the non-exponential blob model. We show the adequacy of this model, and moreover an alternative explanation for the young-age broadening and delayed formation of positronium.
3
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Is Kapton Really That Simple?

88%
Dauwe C., De Baerdemaeker J., Van Waeyenberge B., Djourelov N., Laforest N.
Acta Physica Polonica A
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2008
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vol. 113
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issue 5
1315-1319
EN
Age momentum correlation experiments in kapton has revealed the existence of two positron states corresponding to the trapping of positrons on the partially negatively charged O and/or N sites in the polymer chain. A young age broadening of the annihilation line shape is also observed and is attributed to the annihilation in flight of the positrons.
4
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The Influence of the Defect Structure on the Nitriding of Fe by PIII

88%
De Baerdemaeker J., Jirásková Y., Schaaf P., Segers D., Dauwe C.
Acta Physica Polonica A
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2005
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vol. 107
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issue 5
817-820
EN
Plasma ion immersion implantation is a promising technique for nitriding. A case study of the characterization of the plasma ion immersion implantation nitriding of iron alloys is the plasma ion immersion implantation nitriding of pure Fe. A set of Fe samples of 99.98% purity and with different defect structure was plasma ion immersion implantation nitrided at different temperatures. Depth profiling of the samples was achieved using positron annihilation spectroscopy with a slow positron beam and nanoindentation. A correspondence was found between the line shape parameter S and the hardness of the plasma ion immersion implantation treated samples.
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