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Investigation of the Resonant Vibration Modes of Self Interstitial Atoms in Al by Diffuse Inelastic Neutron Scattering

Published online by Cambridge University Press:  26 February 2011

R. Urban ,
P. Ehrhart ,
W. Chilling ,
H.R. Schober  and
H. Lauter
R. Urban
Affiliation:
Kerforschungsanlage Jülich, IFF, D-5170 Jülich, FRG
P. Ehrhart
Affiliation:
Kerforschungsanlage Jülich, IFF, D-5170 Jülich, FRG
W. Chilling
Affiliation:
Kerforschungsanlage Jülich, IFF, D-5170 Jülich, FRG
H.R. Schober
Affiliation:
Kerforschungsanlage Jülich, IFF, D-5170 Jülich, FRG
H. Lauter
Affiliation:
ILL, F-38042 Grenoble Cedex, France
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Abstract

Single crystals of Al were irradiated up to 480 ppm of Frenkel defects using a specially developed irradiation facility for high dose electron irradiation of large samples below 20 K. Diffuse inelastic neutron scattering measurements have been performed at these samples to study the dynamics of single self interstitial atoms. The measurements were made at 6 K on the sample before annealing and after annealing at 46 K (above stage I) and at 300 K (after complete recovery). The irradiated samples showed a significant increase of the inelastic scattering intensity at transferred energies between 0.7 and 2 THz. By comparison with the results of computer calculations the different frequencies of the energy loss spectrum could be attributed to the different vibration modes of interstitial atoms. The frequencies of the most significant modes of the self interstitial atom are determined to be υ = 0.75 THz and υ = 1.35 THz for the translation-(A2u) and libration-(Eg) mode, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 82: Symposium I – Characterization of Defects in Materials , 1986 , 89
Copyright
Copyright © Materials Research Society 1987

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References

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