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Neutron Scattering Study of Vibrational Modes in Glassy Gel-xSnxSe2

Published online by Cambridge University Press:  22 February 2011

R. L. Cappelletti ,
W.A. Kamitakahara  and
Didarul Islam
R. L. Cappelletti
Affiliation:
Department of Physics and Astronomy, Ohio University, Athens, OH 45701
W.A. Kamitakahara
Affiliation:
Reactor Radiation Division, National Institute of Standards and Technology
Didarul Islam
Affiliation:
Department of Physics, Central Michigan University, Mt. Pleasant, MI 48853
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Abstract

The neutron vibrational density of states has been determined from neutron time-of-flight scattering in g-Ge1-xSnxSe2 with x = 0, 0.3, 0.35, and 0.5 to search for "floppy" modes. Previously Raman and Mossbauer studies1 have been interpreted on the basis that the addition of Sn to the GeSe2 network reduces the average number of mechanical constraints per atom allowing one to tune through the rigidity percolation threshold near x = 0.35. A comparison of the VDOS measured in this work below 10 meV for all samples shows that they are nearly identical indicating no evidence of the existence of floppy modes in these samples. Ab initio molecular dynamics2 calculations of the VDOS show good agreement with the measured results for g-GeSe2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 667
Copyright
Copyright © Materials Research Society 1995

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References

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