Lattice dynamics and self-diffusion in niobium at elevated temperatures

F. Guthoff; B. Hennion; C. Herzig; W. Petry; H. R. Schober; J. Trampenau

doi:10.1088/0953-8984/6/31/020

Lattice dynamics and self-diffusion in niobium at elevated temperatures

F. Guthoff, B. Hennion, C. Herzig, W. Petry, H. R. Schober, J. Trampenau

Department of Physics

Institut Laue-Langevin

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

The temperature dependence of the phonon dispersion of Nb from room temperature up to 2223 K has been measured by means of inelastic neutron scattering. Over a temperature range of nearly 2000 K the dispersion changes only moderately. Effects due to electron-phonon interaction almost vanish at the highest temperature. Parameterizing the dispersion curves by Born-von Karman force constants, the phonon density of states g( omega ) at different temperatures was computed. Employing the model of phonon controlled diffusion in BCC metals, the migration barrier H^m and the formation entropy S^f have been calculated. The results agree with those of quenching and electron irradiation experiments.

Original language	English
Article number	020
Pages (from-to)	6211-6220
Number of pages	10
Journal	Journal of Physics Condensed Matter
Volume	6
Issue number	31
DOIs	https://doi.org/10.1088/0953-8984/6/31/020
State	Published - 1994

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title = "Lattice dynamics and self-diffusion in niobium at elevated temperatures",

abstract = "The temperature dependence of the phonon dispersion of Nb from room temperature up to 2223 K has been measured by means of inelastic neutron scattering. Over a temperature range of nearly 2000 K the dispersion changes only moderately. Effects due to electron-phonon interaction almost vanish at the highest temperature. Parameterizing the dispersion curves by Born-von Karman force constants, the phonon density of states g( omega ) at different temperatures was computed. Employing the model of phonon controlled diffusion in BCC metals, the migration barrier Hm and the formation entropy Sf have been calculated. The results agree with those of quenching and electron irradiation experiments.",

author = "F. Guthoff and B. Hennion and C. Herzig and W. Petry and Schober, {H. R.} and J. Trampenau",

year = "1994",

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T1 - Lattice dynamics and self-diffusion in niobium at elevated temperatures

AU - Guthoff, F.

AU - Hennion, B.

AU - Herzig, C.

AU - Petry, W.

AU - Schober, H. R.

AU - Trampenau, J.

PY - 1994

Y1 - 1994

N2 - The temperature dependence of the phonon dispersion of Nb from room temperature up to 2223 K has been measured by means of inelastic neutron scattering. Over a temperature range of nearly 2000 K the dispersion changes only moderately. Effects due to electron-phonon interaction almost vanish at the highest temperature. Parameterizing the dispersion curves by Born-von Karman force constants, the phonon density of states g( omega ) at different temperatures was computed. Employing the model of phonon controlled diffusion in BCC metals, the migration barrier Hm and the formation entropy Sf have been calculated. The results agree with those of quenching and electron irradiation experiments.

AB - The temperature dependence of the phonon dispersion of Nb from room temperature up to 2223 K has been measured by means of inelastic neutron scattering. Over a temperature range of nearly 2000 K the dispersion changes only moderately. Effects due to electron-phonon interaction almost vanish at the highest temperature. Parameterizing the dispersion curves by Born-von Karman force constants, the phonon density of states g( omega ) at different temperatures was computed. Employing the model of phonon controlled diffusion in BCC metals, the migration barrier Hm and the formation entropy Sf have been calculated. The results agree with those of quenching and electron irradiation experiments.

UR - http://www.scopus.com/inward/record.url?scp=0028479625&partnerID=8YFLogxK

U2 - 10.1088/0953-8984/6/31/020

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EP - 6220

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

IS - 31

M1 - 020

ER -

Lattice dynamics and self-diffusion in niobium at elevated temperatures

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