Exploring nanovoids in spinel ceramics using positron-positronium trapping model

The investigation focused on nanovoids (free-volume defects) in spinel MgAl 2 O 4 ceramics, synthesized at various temperatures, both before and after saturation (water-immersion), utilizing the positron annihilation spectroscopy method. The findings were analyzed within the framework of a multi-cha...

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Published in:Molecular Crystals and Liquid Crystals 2024-11, Vol.768 (16), p.849-857
Main Authors: Klym, H., Kostiv, Yu
Format: Article
Language:English
Subjects:
Atomic structure
Ceramics
Crystal defects
free-volume
Grain boundaries
humidity
nanovoids
Positron annihilation
Positronium
Positrons
sensors
Spinel
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Kostiv, Yu
description The investigation focused on nanovoids (free-volume defects) in spinel MgAl 2 O 4 ceramics, synthesized at various temperatures, both before and after saturation (water-immersion), utilizing the positron annihilation spectroscopy method. The findings were analyzed within the framework of a multi-channel model. It was demonstrated that this model integrates channels capturing positrons by volumetric defects and the decay of ortho-positronium atoms. Within this refined approach, the first component reflects the microstructural characteristics of the spinel structure, the second component corresponds to volumetric defects near grain boundaries, while the third pertains to the "pick-off" process of ortho-positronium annihilation within water-filled nanopores of the ceramics.
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subjects Atomic structure
Ceramics
Crystal defects
free-volume
Grain boundaries
humidity
nanovoids
Positron annihilation
Positronium
Positrons
sensors
Spinel
title Exploring nanovoids in spinel ceramics using positron-positronium trapping model
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