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Ion-Irradiation-Induced Amorphization Of Cadmium Niobate Pyrochlore

Published online by Cambridge University Press:  21 March 2011

A. Meldrum ,
K. Beaty ,
L. A. Boatner  and
C. W. White
A. Meldrum
Affiliation:
Dept. of Physics, University of Alberta, Edmonton AB, T5N 2A3, Canada; Solid State
K. Beaty
Affiliation:
Dept. of Physics, University of Alberta, Edmonton AB, T5N 2A3, Canada; Solid State
L. A. Boatner
Affiliation:
Division, Oak Ridge National Laboratory, Oak Ridge TN 37831, USA
C. W. White
Affiliation:
Division, Oak Ridge National Laboratory, Oak Ridge TN 37831, USA
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Abstract

Irradiation-induced amorphization of Cd2Nb2O7 pyrochlore was investigated by means of in-situ temperature-dependent ion-irradiation experiments in a transmission electron microscope, combined with ex-situ ion-implantation (at ambient temperature) and RBS/channeling analysis. The in-situ experiments were performed using Ne or Xe ions with energies of 280 and 1200 keV, respectively. For the bulk implantation experiments, the incident ion energies were 70 keV (Ne+) and 320 keV (Xe2+). The critical amorphization temperature for Cd2Nb2O7 is ∼480 K (280 keV Ne+) or ∼620 K (1200 keV Xe2+). The dose for in-situ amorphization at room temperature is 0.22 dpa for Xe2+, but is 0.65 dpa for Ne+ irradiation. Both types of experiments suggest a cascade overlap mechanism of amorphization. The results were analyzed in light of available models for the crystalline-to-amorphous transformation and were compared to previous ionirradiation experiments on other pyrochlore compositions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 650: Symposium R – Microstructural Processes in Irradiated Materials-2000 , 2000 , R5.4
Copyright
Copyright © Materials Research Society 2001

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References

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