الفهرس Only 14 pages are availabe for public view
 |  | from | 169 |  |  |
| | | from | 169 | | |
Abstract
Amorphous materials such as oxide glasses are widely used in various
applications such as communication, and radiation detectors. This work is
aimed to study some mechanical and optical properties of Borate glasses
with the additions of TiO2, Li2O, CaO mol% and irradiated with ã– ray.
The work of this thesis can be summarized in the following steps:-
1- The melt quench technique is used for the preparation of one series of
60 B2O3 + 30 Li2O + 10 CaO + 0 TiO2,
57.5 B2O3 + 30 Li2O + 10 CaO + 2.5 TiO2,
55 B2O3 + 30 Li2O + 10 CaO + 5 TiO2,
52.5 B2O3 + 30 Li2O + 10 CaO + 7.5 TiO2,
50 B2O3 + 30 Li2O + 10 CaO + 10 TiO2,
47.5 B2O3 + 30 Li2O + 10 CaO + 12.5 TiO2,
45 B2O3 + 30 Li2O + 10 CaO + 15 TiO2 mol%.
Amorphous character of the prepared glasses was confirmed by X-ray
diffraction technique.
2- Archimedes method was used for determining the density of samples
and hence the molar volume. In glass system it was observed that there is
a pronounced discontinuity in the compositional dependence of both
density and molar volume. This behavior indicates a structural change in
the glass network. The variations of density and molar volume with TiO2
content showed an increase in density with increasing TiO2 content,
which may be attributed to substitution of boron atom by titanium atom.
Also, the molar volume showed a decrease with increasing TiO2 content.
3- Pulse echo technique was used for measuring longitudinal and shear
wave velocities, which were used to calculate Young, Bulk, Shear,