Title
Positron annihilation study of nanocrystalline <tex>$Ni_{3}Al$</tex> : simulations and measurements Positron annihilation study of nanocrystalline <tex>$Ni_{3}Al$</tex> : simulations and measurements
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lausanne ,
Subject
Physics
Source (journal)
Materials science forum. - Lausanne, 1984, currens
Source (book)
12th International Conference on Positron Annihilation (ICPA-12), AUG 06-12, 2000, UNIV BUNDERSWEHR MUNCHEN, NEUBIBERG, GERMANY
Volume/pages
363-3(2001) , p. 94-96
ISBN
0-87849-875-3
ISI
000170202400023
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
A positron lifetime experiment is performed on samples produced by the compaction of nanocrystalline Ni3Al powder synthesized by the inert-gas condensation technique. In the lifetime spectrum we observe two components corresponding to defects. Computer (virtual) samples of n-Ni3Al are obtained using molecular dynamics combined with the Metropolis Monte Carlo technique. Positron lifetime calculations are then performed on selected regions of simulated samples. For this purpose, a new computational technique based on a generalization of the atomic superposition method for non-periodic systems was developed. Lifetimes calculated in this way are compared to experiment.
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