| Issue |
J. Phys. Colloques
Volume 46, Number C10, Décembre 1985
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
|
|
|---|---|---|
| Page(s) | C10-439 - C10-443 | |
| DOI | https://doi.org/10.1051/jphyscol:19851097 | |
J. Phys. Colloques 46 (1985) C10-439-C10-443
DOI: 10.1051/jphyscol:19851097
THE INTERNAL FRICTION OF VANADIUM-PHOSPHATE GLASSES DOPED WITH BaO AND SrO
D. BEDNARCZYK, W. CHOMKA and D. SAMATOWICZTechnical University of Gdask, Department of Technical Physics and Applied Mathematics, Gdask, Poland
Abstract
The vanadium-phosphate glasses of chemical composition xBaO · (50-x) V2O5 · 50 P2O5 and xSrO · (50-x) V2O5·50 P2O5 x from 10 to 50 mol % were investigated using the torsion pendulum at the frequency range 0,7 ÷ 21 Hz and at temperatures between 120 and 650 K. The internal friction curve Q-1 /T/ reveals the low-temperature maximum connected with the electron relaxation between V+4 and V+5. The influence of BaO and SrO on the relaxation process is studied. The activation energy of this process increases from about 0,33 eV to 0,73 eV when x increases from 10 to 40 mol%. The low-temperature maximum slightly decreases and shifts to higher temperature when the con-tent of V2O5 decreases from 50 to 10 mol% and disapper in glasses without V2O5. The activation energies of internal friction low-temperature maximum are related to the activation energies for conductivity.