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Neutron Scattering from Lattice Defects

Published online by Cambridge University Press:  21 February 2011

Johann Peisl ,
Helmut Dosch  and
Stefan Kirchner
Johann Peisl
Affiliation:
Sektion Physik, Ludwig–Maximilians–Universität, 8000 München 22, FRG
Helmut Dosch
Affiliation:
Sektion Physik, Ludwig–Maximilians–Universität, 8000 München 22, FRG
Stefan Kirchner
Affiliation:
Sektion Physik, Ludwig–Maximilians–Universität, 8000 München 22, FRG
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Abstract

For O in Nb the experimental scattering distribution can be described by a so-called 3-force model. The scattering pattern exhibits close similarity to the one observed for the ω-phase in some bcc alloys. It is shown that the lattice distortion calculated from the proposed 3-force model contains static fluctuation of the ω-phase. The ω-phase is closely related to the minimum in the LA 2/3 (111) phonon dispersion branch. With decreasing temperature the frequency of this phonon decreases, whereas the elastic diffuse scattering at the same position increases. This “softening” of the lattice, together with an increasing “central peak”, gives an equivalent description of the situation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 211
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

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