th  - 1987 - 51st ENC Conference

MF11
TELLURI~-I~5 AND CADMIUM-Ill NMR STUDY OF BONDING PROPERTIES
OF Cd(l-x)Zn(x)Te SEMICONDUCTORS
K. Beshah, D. Zamir, P. Beola, P. A. Wolff, R. G. Griffin
G
Francis Bitter National Magnet Laboratory
Massachusetts Institute of Technology
Cambridge. MA 02139
The ternary alloy Cd(1-x)Zn(x)Te has a zinc blend structure
whose properties are dependent on the relative composition x.
Eventhough elaborate theoretical calculations have been done on
these materials,experimental verifications are scarce. Recently
EXAFS has been used to verify the bimodal distribution of bond
lengths in similar alloys. X-Ray diffraction teohnlque averages
over many unit cells which makes it difficult to probe looallzed
properties.
We have applied solid state NMR techniques to determine
first, second, and third nearest neighbors effect on tellurium
and o~Imium nuclei from analysis of chemical shifts and linewidths
of the NMR spectra for various compositions, x. From these results
we were able to draw conclusions about charge transfer between
various atoms,the relation between change in bond length and
chemical shift as a function of x. and existence of clustering.
The later was determined by comparing intensities of experimental
data to theoretically calculated spectra assuming random
distribution.