Structure of amorphous selenium studied by neutron diffraction

Flemming Yssing Hansen, Torben Steen Knudsen, K. Carneiro

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Abstract

Neutron diffraction measurements on amorphous selenium have been performed at 293 and 80 K. Careful analyses of the instrumental corrections were made to avoid systematic errors in the measured structure factor S (kappa) in the wave vector region 0 ? kappa ? 12 Å−1. As a result of the data treatment, the neutron scattering cross sections of selenium are determined to be sigmacoh = 8.4±0.1 b and sigmainc = 0.1±0.1 b. Using the fact that S (kappa) for large kappa's is determined by the short distances in the sample, a new method for extrapolation of the experimental S (kappa) until convergence is proposed. This allows an accurate determination of g (r) showing peaks at distances that agree well with the previous x−ray experiment by Kaplow et al. for distances up to 11 Å. However, only partial agreement is obtained when finer details of g (r), e.g., the width of the first peak, are considered. Finally, we give a brief discussion of the different models for the structure of amorphous selenium, taking both diffraction measurements and thermodynamic considerations into account. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
Original languageEnglish
JournalJournal of Chemical Physics
Volume62
Issue number4
Pages (from-to)1556-1565
ISSN0021-9606
DOIs
Publication statusPublished - 1975

Bibliographical note

Copyright (1975) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Cite this

Hansen, Flemming Yssing ; Knudsen, Torben Steen ; Carneiro, K. / Structure of amorphous selenium studied by neutron diffraction. In: Journal of Chemical Physics. 1975 ; Vol. 62, No. 4. pp. 1556-1565.
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title = "Structure of amorphous selenium studied by neutron diffraction",
abstract = "Neutron diffraction measurements on amorphous selenium have been performed at 293 and 80 K. Careful analyses of the instrumental corrections were made to avoid systematic errors in the measured structure factor S (kappa) in the wave vector region 0 ? kappa ? 12 {\AA}−1. As a result of the data treatment, the neutron scattering cross sections of selenium are determined to be sigmacoh = 8.4±0.1 b and sigmainc = 0.1±0.1 b. Using the fact that S (kappa) for large kappa's is determined by the short distances in the sample, a new method for extrapolation of the experimental S (kappa) until convergence is proposed. This allows an accurate determination of g (r) showing peaks at distances that agree well with the previous x−ray experiment by Kaplow et al. for distances up to 11 {\AA}. However, only partial agreement is obtained when finer details of g (r), e.g., the width of the first peak, are considered. Finally, we give a brief discussion of the different models for the structure of amorphous selenium, taking both diffraction measurements and thermodynamic considerations into account. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.",
author = "Hansen, {Flemming Yssing} and Knudsen, {Torben Steen} and K. Carneiro",
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Structure of amorphous selenium studied by neutron diffraction. / Hansen, Flemming Yssing; Knudsen, Torben Steen; Carneiro, K.

In: Journal of Chemical Physics, Vol. 62, No. 4, 1975, p. 1556-1565.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Structure of amorphous selenium studied by neutron diffraction

AU - Hansen, Flemming Yssing

AU - Knudsen, Torben Steen

AU - Carneiro, K.

N1 - Copyright (1975) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

PY - 1975

Y1 - 1975

N2 - Neutron diffraction measurements on amorphous selenium have been performed at 293 and 80 K. Careful analyses of the instrumental corrections were made to avoid systematic errors in the measured structure factor S (kappa) in the wave vector region 0 ? kappa ? 12 Å−1. As a result of the data treatment, the neutron scattering cross sections of selenium are determined to be sigmacoh = 8.4±0.1 b and sigmainc = 0.1±0.1 b. Using the fact that S (kappa) for large kappa's is determined by the short distances in the sample, a new method for extrapolation of the experimental S (kappa) until convergence is proposed. This allows an accurate determination of g (r) showing peaks at distances that agree well with the previous x−ray experiment by Kaplow et al. for distances up to 11 Å. However, only partial agreement is obtained when finer details of g (r), e.g., the width of the first peak, are considered. Finally, we give a brief discussion of the different models for the structure of amorphous selenium, taking both diffraction measurements and thermodynamic considerations into account. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.

AB - Neutron diffraction measurements on amorphous selenium have been performed at 293 and 80 K. Careful analyses of the instrumental corrections were made to avoid systematic errors in the measured structure factor S (kappa) in the wave vector region 0 ? kappa ? 12 Å−1. As a result of the data treatment, the neutron scattering cross sections of selenium are determined to be sigmacoh = 8.4±0.1 b and sigmainc = 0.1±0.1 b. Using the fact that S (kappa) for large kappa's is determined by the short distances in the sample, a new method for extrapolation of the experimental S (kappa) until convergence is proposed. This allows an accurate determination of g (r) showing peaks at distances that agree well with the previous x−ray experiment by Kaplow et al. for distances up to 11 Å. However, only partial agreement is obtained when finer details of g (r), e.g., the width of the first peak, are considered. Finally, we give a brief discussion of the different models for the structure of amorphous selenium, taking both diffraction measurements and thermodynamic considerations into account. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.

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