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Radiation Effects in Nonmetals: Amorphization, Phase Decomposition, and Nanoparticles

Published online by Cambridge University Press:  15 February 2011

A. Meldrum ,
L.A. Boatner ,
C.W. White  and
D.O. Henderson
A. Meldrum
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37831-6057
L.A. Boatner
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37831-6057
C.W. White
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37831-6057
D.O. Henderson
Affiliation:
Fisk University, Department of Physics, Nashville, TN 37208
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Abstract

Radiation effects in nonmetals have been studied for well over a century by geologists, mineralogists, physicists, and materials scientists. The present work focuses on recent results of investigations of the ion-beam-induced amorphization of the ABO4 compounds – including the orthophosphates (LnPO4; Ln = lanthanides) and the orthosilicates: zircon (ZrSiO4), hafnon (HfSiO4), and thorite (ThSiO4). In the case of the orthosilicates, heavy-ion irradiation at elevated temperatures causes the precipitation of a nanocrystalline metal oxide. Electron irradiation effects in these amorphized insulating ceramics can produce localized recrystallization on a nanometer scale. Similar electron irradiation techniques were used to nucleate monodispersed compound semiconductor nanocrystals formed by ion implantation of the elemental components into fused silica. Methods for the formation of novel structural relationships between embedded nanocrystals and their hosts have been developed and the results presented here demonstrate the general flexibility of ion implantation and irradiation techniques for producing unique near-surface microstructures in ion-implanted host materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 540: Symposium N / Microstructural Processes in Irradiated Materials , 1998 , 135
Copyright
Copyright © Materials Research Society 1999

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