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Local Bonding Asymmetries in Ge-As-Se Glasses

Published online by Cambridge University Press:  31 January 2011

Eldar Mammadov ,
Craig Taylor ,
David Baker ,
David Bobela ,
Arneyl Reyes ,
Philip Kuhns  and
Salima Mehdiyeva
Eldar Mammadov
Affiliation:
[email protected]@physics.ab.az, Institute of Physics, Baku, Azerbaijan
Craig Taylor
Affiliation:
[email protected], Colorado School of Mines, Physics, Golden, Colorado, United States
David Baker
Affiliation:
[email protected], Colorado School of Mines, Physics, Golden, Colorado, United States
David Bobela
Affiliation:
[email protected], Colorado School of Mines, Physics, Golden, Colorado, United States
Arneyl Reyes
Affiliation:
[email protected], NHMFL, Tallahasse, Florida, United States
Philip Kuhns
Affiliation:
[email protected], NHMFL, Tallahasse, Florida, United States
Salima Mehdiyeva
Affiliation:
[email protected], Institute of Physics, Baku, Azerbaijan
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Abstract

High magnetic fields up to 22 T have been applied to determine the local bonding asymmetries in the Ge2As2Se7 and Ge2As2Se5 glasses by 75As NMR. The results are analyzed using computer simulations of the line-shape. The asymmetry parameter η of the electric field gradient at arsenic sites in Ge2As2Se7 is found to be about 0.2, indicating that the dominant arsenic structural units in the composition are nearly axially symmetric pyramids. In the Ge2As2Se5 glass, however, the 75As NMR spectrum exhibits no well-resolved structure, revealing the existence of highly asymmetric sites. The experimental data are fitted using the previously obtained distribution of quadrupole coupling constants from pulsed 75As NQR experiments. These NMR simulations assume a broad distribution of the asymmetry parameter. The results are in agreement with the NQR studies in the same compositions.

Keywords

amorphousnuclear magnetic resonance (NMR)bonding
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1160: Symposium H – Materials and Physics for Nonvolatile Memories , 2009 , 1160-H14-04
Copyright
Copyright © Materials Research Society 2009

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