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Measured Displacement Energies of Oxygen Ions in Zirconolite and Rutile

Published online by Cambridge University Press:  21 March 2011

Katherine L. Smith
Materials Division, Australian Nuclear Science and Technology Organisation, PMB 1, Menai,NSW 2234, Australia. Contact
Ronald Cooper
Department of Chemistry, University of Melbourne, Parkville, Vic. 3052, Australia
Eric R. Vance
Materials Division, Australian Nuclear Science and Technology Organisation, PMB 1, Menai,NSW 2234, Australia.
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Optical emission spectra in the 300-700 nm range were collected from zirconolite and rutile specimens irradiated with a 3 μs pulsed electron beam using a Febetron 706 variable energy pulsed electronbeam generator. The long-lived emissions (up to microseconds after the electron pulse) consist of broad (halfwidths ~ 100 nm) bands centred around ~400 nm. Over the range 0.2 MeV to 0.6 MeV, the emission intensity per unit dose versus electron beam energy data from the rutile sample showed a single stage dependence on electron beam energy, whereas the zirconolite data suggested a two stage dependence. Rutile has a threshold of 0.23 ½ 0.02 MeV, which gives an Ed value of 39 ½ 4 eV for oxygen. Zirconolite has a threshold of 0.26 ½ 0.02 MeV, which gives an Ed value of 45 ½4 eV for oxygen. These data are discussed in the context of previously measured and calculated Ed values for other oxides.

Research Article
Copyright © Materials Research Society 2001

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