In situ TEM observation of decomposition of high-purity sapphire

C. L. Chen; H. Furusho; H. Mori

doi:10.1080/09500830802649778

In situ TEM observation of decomposition of high-purity sapphire

C. L. Chen, H. Furusho, H. Mori

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The decomposition of -Al2O3 under 200 keV electron irradiation has been investigated by in situ high-resolution electron microscopy (HREM). It was confirmed that aluminium precipitated from -Al2O3 under 200 keV electron irradiation for less than 1 min over the temperature range from 700 to 1273 K. The electron dose rate was of the order of 1023 e m-2 s-1 and the vacuum level of the microscope was better than 10-6 Pa. The mechanisms of -Al2O3 decomposition were discussed based on two possible decomposition models: the thermally activated atom movement and the forced atom displacement.

Original language	English
Pages (from-to)	113-119
Number of pages	7
Journal	Philosophical Magazine Letters
Volume	89
Issue number	2
DOIs	https://doi.org/10.1080/09500830802649778
Publication status	Published - 2009 Feb
Externally published	Yes

Keywords

Alumina
Electron irradiation
Electron microscopy
Phase transformations

ASJC Scopus subject areas

Condensed Matter Physics

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10.1080/09500830802649778

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@article{429b0d35217b4afba122a08571e41c02,

title = "In situ TEM observation of decomposition of high-purity sapphire",

abstract = "The decomposition of -Al2O3 under 200 keV electron irradiation has been investigated by in situ high-resolution electron microscopy (HREM). It was confirmed that aluminium precipitated from -Al2O3 under 200 keV electron irradiation for less than 1 min over the temperature range from 700 to 1273 K. The electron dose rate was of the order of 1023 e m-2 s-1 and the vacuum level of the microscope was better than 10-6 Pa. The mechanisms of -Al2O3 decomposition were discussed based on two possible decomposition models: the thermally activated atom movement and the forced atom displacement.",

keywords = "Alumina, Electron irradiation, Electron microscopy, Phase transformations",

author = "Chen, {C. L.} and H. Furusho and H. Mori",

note = "Funding Information: A part of this work was supported by {\textquoteleft}Nanotechnology Network Project of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan{\textquoteright} at the Research Center for Ultrahigh Voltage Electron Microscopy, Osaka University (Handai multi-functional Nano-Foundry). Also a part of this work was supported by Priority Assistance for the Formation of Worldwide Reowned Centers of Research - The Global COE Program (Project: Center of Excellence for Advanced Structural and Functional Materials Design) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. The authors would like to thank Mr A. Yabuuchi for part of calculation in the present work.",

year = "2009",

month = feb,

doi = "10.1080/09500830802649778",

language = "English",

volume = "89",

pages = "113--119",

journal = "Philosophical Magazine Letters",

issn = "0950-0839",

publisher = "Taylor and Francis Ltd.",

number = "2",

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TY - JOUR

T1 - In situ TEM observation of decomposition of high-purity sapphire

AU - Chen, C. L.

AU - Furusho, H.

AU - Mori, H.

N1 - Funding Information: A part of this work was supported by ‘Nanotechnology Network Project of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan’ at the Research Center for Ultrahigh Voltage Electron Microscopy, Osaka University (Handai multi-functional Nano-Foundry). Also a part of this work was supported by Priority Assistance for the Formation of Worldwide Reowned Centers of Research - The Global COE Program (Project: Center of Excellence for Advanced Structural and Functional Materials Design) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. The authors would like to thank Mr A. Yabuuchi for part of calculation in the present work.

PY - 2009/2

Y1 - 2009/2

N2 - The decomposition of -Al2O3 under 200 keV electron irradiation has been investigated by in situ high-resolution electron microscopy (HREM). It was confirmed that aluminium precipitated from -Al2O3 under 200 keV electron irradiation for less than 1 min over the temperature range from 700 to 1273 K. The electron dose rate was of the order of 1023 e m-2 s-1 and the vacuum level of the microscope was better than 10-6 Pa. The mechanisms of -Al2O3 decomposition were discussed based on two possible decomposition models: the thermally activated atom movement and the forced atom displacement.

AB - The decomposition of -Al2O3 under 200 keV electron irradiation has been investigated by in situ high-resolution electron microscopy (HREM). It was confirmed that aluminium precipitated from -Al2O3 under 200 keV electron irradiation for less than 1 min over the temperature range from 700 to 1273 K. The electron dose rate was of the order of 1023 e m-2 s-1 and the vacuum level of the microscope was better than 10-6 Pa. The mechanisms of -Al2O3 decomposition were discussed based on two possible decomposition models: the thermally activated atom movement and the forced atom displacement.

KW - Alumina

KW - Electron irradiation

KW - Electron microscopy

KW - Phase transformations

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U2 - 10.1080/09500830802649778

DO - 10.1080/09500830802649778

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SN - 0950-0839

VL - 89

SP - 113

EP - 119

JO - Philosophical Magazine Letters

JF - Philosophical Magazine Letters

IS - 2

ER -

In situ TEM observation of decomposition of high-purity sapphire

Abstract

Keywords

ASJC Scopus subject areas

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