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Quasielastic Neutron Scattering and Solid State Diffusion$
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Rolf Hempelmann

Print publication date: 2000

Print ISBN-13: 9780198517436

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198517436.001.0001

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Metals and alloys

Metals and alloys

Chapter:
(p.230) 9 Metals and alloys
Source:
Quasielastic Neutron Scattering and Solid State Diffusion
Author(s):

Rolf Hempelmann

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198517436.003.0009

For the fcc noble metals and for bcc metals of group V and VI such as Mo, W, V, and Nb, atomic diffusion is slow compared to the case of bcc alkali metals Li, Na, or K. The group IV metals Ti, Zr, and Hf have still higher diffusivities. The first section of the chapter describes the investigation of sodium diffusion, in particular presenting the encounter model of vacancy diffusion in detail. The second part deals with similar experiments on bcc-β-titanium, where the relation between high diffusivity and soft modes as measured by triple axis spectrometry is explained. QENS diffusion studies are also performed for some alloys and intermetallic compounds.

Keywords:   vacancy diffusion, encounter model, soft modes

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