| Numéro |
J. Phys. Colloques
Volume 46, Numéro C10, Décembre 1985
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
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| Page(s) | C10-513 - C10-516 | |
| DOI | https://doi.org/10.1051/jphyscol:198510113 | |
J. Phys. Colloques 46 (1985) C10-513-C10-516
DOI: 10.1051/jphyscol:198510113
ULTRASONIC ATTENUATION AND VELOCITY IN Cd0.55 Mn0.45Te+
P. MAHESWARANATHAN, R.J. SLADEK and U. DEBSKAPurdue University, West Lafayette, IN 47907, U.S.A.
Abstract
We deduce the electromechanical coupling factor, piezoelectric constant (e14), and electrical conductivity of Cd0.55Mn0.45Te from the attenuation maximum and velocity change of piezoelectrically-active [110][001] ultrasonic shear waves which occur as a function of temperature, T. Electromechanical coupling and el4 are much larger in Cd0.55Mn0.45Te than in CdTe due to less bond charge transfer in the former because, we believe, of hybridization of Mn 3d orbitals into the tetrahedral bonds. The dc resistivity was measured and found to be an exponential function of 1/T in accord with the electrical conductivity deduced from our ultrasonic data. The conductivity activation energy we identify with the ionization energy of centers which provide mobile charge carriers (holes).