Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1580092 | Materials Science and Engineering: A | 2009 | 5 Pages |
Abstract
The acoustic properties at 10 and 30Â MHz of dry and wet boron oxide samples have been investigated over the temperature range between 10 and 300Â K. Significant differences in the temperature dependence of acoustic attenuation and longitudinal sound velocity as a function of the annealing treatment and water content have been revealed in the investigated glasses. Measurements, densely performed over the whole temperature range, together with a detailed analysis of the dispersive behaviors, allowed us to evidence the complexity of the relaxational dynamics, as due to the coexistence of different local motions. Above 150Â K, the data analysis has been based on the existence of two relaxation processes, whose strengths result to be strictly dependent on the water content. Finally, a possible relation to the empty volume originated from the arrangement of the structural units on nanometer length scale has been put forward.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
G. D'Angelo, C. Crupi, V. Conti Nibali, M.A. Ramos,