M.A. Lutz, R.M. Feenstra, et al.
Surface Science
Nuclear quadrupole resonance (NQR) of 75As has been used to study the local bonding structure of glassy arsenic-selenium systems. We have studied the glassy system AsxSe1-x with x=0.08, 0.15, 0.27, 0.32, 0.36, 0.40, 0.50, and 0.60 using 75As NQR at liquid nitrogen temperature (77 K). The 75As NQR spin-echo spectra from x=0.08 up to x=0.40 each consist of a single broad line. As the concentration of arsenic increases, the positions of the peaks decrease approximately linearly from 63 MHz at x=0.08 to 58 MHz at x=0.40. For x=0.50, the spectrum, consists of a very broad asymmetric peak near 81 MHz. The spectrum for x=0.60 consists of three well-resolved, narrow peaks, but otherwise extends over a similar frequency range as that of x=0.50. By comparison with NQR spectra that occur in crystalline arsenic-selenium compounds, these three peaks have been interpreted as due to three fold co-ordinated, pyramidal arsenic sites with, varying numbers of arsenic-arsenic bonds. © 2002 Elsevier Science B.V. All rights reserved.
M.A. Lutz, R.M. Feenstra, et al.
Surface Science
Peter J. Price
Surface Science
O.F. Schirmer, W. Berlinger, et al.
Solid State Communications
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000