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Quantitative Hrem of Electron-Irradiated Quartz

Published online by Cambridge University Press:  16 February 2011

L.C. Qin  and
L.W. Hobbs
L.C. Qin
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science and Engineering, Cambridge, Massachusetts 02139, U.S.A.
L.W. Hobbs
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science and Engineering, Cambridge, Massachusetts 02139, U.S.A.
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Abstract

The progress of heterogeneous amorphization of electron-irradiated quartz was studied in situ by high-resolution electron microscopy (HREM). The transformation front appears surprisingly sharp when viewed close to edge-on, but the apparent morphological evolution when aperiodic and periodic material overlap in projection is one in which gradual changes in image regularity are observed. Electron-microscopical contrast obtained in HREM irradiations was interpreted quantitatively, through the use of image contrast simulations. When the amorphized portion occupies less than about two-thirds of the total thickness, the HREM images continue to appear crystalline. Only when the amorphized thickness fraction exceeds about two-thirds does the resultant image contrast show mainly non-crystalline features.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 373: Symposium Y – Microstructure of Irradiated Materials , 1994 , 329
Copyright
Copyright © Materials Research Society 1995

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References

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