**Author details**

Nicolai B. Jordanov1 , Esmat M.A. Hamzawy2 , Dragomir Tatchev1 and Alexander Karamanov1 \*

1 Institute for Physical Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria

2 Glass Research Department, National Research Centre, Cairo, Egypt

\*Address all correspondence to: karama@ipc.bas.bg

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
