Biaxial texture development in the ion beam assisted deposition of magnesium oxide

Low-energy ion-beam irradiation (

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Veröffentlicht in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2012-02, Vol.272, p.28-32
Hauptverfasser: Groves, James R., Hammond, Robert H., Matias, Vladimir, DePaula, Raymond F., Stan, Liliana, Clemens, Bruce M.
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container_title Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms
container_volume 272
creator Groves, James R.
Hammond, Robert H.
Matias, Vladimir
DePaula, Raymond F.
Stan, Liliana
Clemens, Bruce M.
description Low-energy ion-beam irradiation (
doi_str_mv 10.1016/j.nimb.2011.01.026
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A model system, magnesium oxide (MgO), has been successfully used as a biaxially textured template film for the heteroepitaxial deposition of many materials with texture dependent properties like high temperature superconductors, tunable microwave materials, and ferroelectrics. Here, we present data on the initial nucleation of biaxial crystallographic texture in this model system using an in situ quartz crystal microbalance (QCM) substrate combined with in situ reflected high-energy electron diffraction (RHEED). Correlation of mass uptake with the RHEED images of the growing surface shows that the development of crystallographic biaxial texture in this material system occurs suddenly as the initially polycrystalline MgO films reaches a critical film thickness of 2 nm. This texture continues to improve during subsequent growth. A simple model shows that the effect is not due simply to coverage effects. 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Correlation of mass uptake with the RHEED images of the growing surface shows that the development of crystallographic biaxial texture in this material system occurs suddenly as the initially polycrystalline MgO films reaches a critical film thickness of 2 nm. This texture continues to improve during subsequent growth. A simple model shows that the effect is not due simply to coverage effects. We use a combination of in situ RHEED and ex situ transmission electron microscopy to further elucidate the mechanism of this sudden texture formation. 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subjects Biaxial texture
Crystallography
Deposition
Ion beam assisted deposition
Magnesium oxide
Mathematical models
Microorganisms
Nucleation
Nucleation and growth
RHEED
Surface layer
Texture
title Biaxial texture development in the ion beam assisted deposition of magnesium oxide
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