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Neutron-Zwischenreflex-Scattering from Point Defects in Crystals

Published online by Cambridge University Press:  25 February 2011

H. Dosch  and
J. Peisl
H. Dosch
Affiliation:
Sektion Physik der Ludwig-Maximilians-Universitat Munchen, D 8000 Munchen 22, Federal Republic of Germany
J. Peisl
Affiliation:
Sektion Physik der Ludwig-Maximilians-Universitat Munchen, D 8000 Munchen 22, Federal Republic of Germany
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Abstract

Diffuse neutron or x-ray scattering close to the Bragg peaks (Huang scattering) and far away from Bragg peaks (Zwischenreflex-scattering) supplies detailed information on point defects and small agglomerates in crystals [1]. The defect structure, i.e. the lattice location, the displacements of the near neighbours and the strength and symmetry of the long ranged displacement field can be determined. In order to demonstrate the power of this technique, we report on recent experimental results. Interstitially dissolved N and O in Nb are located on octahedral sites and create rather large displacements in their vicinity. Their long ranged displacement field shows the symmetry of the defect site. The light interstitials H and D in Nb are located on tetrahedral sites and their long ranged displacement field shows the symmetry of the host lattice. A rather complicated defect model is necessary in order to explain the local defect structure.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 69: Symposium D – Materials Characterization , 1986 , 409
Copyright
Copyright © Materials Research Society 1986

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