%0 Journal Article
%T Optical Parameters and Electrical Transport Properties of Some Barium-Sodium-Borate Glasses Doped Bismuth Oxide
%J -
%D 2018
%X Glasses having the composition, [(70-x) mol% B 2O 3- x mol% Bi 2O 3- 10 mol% BaO- 20 mol% Na 2O, where 0¡Ü x ¡Ü20], have been prepared by the melt quenching method. Density, molar volume, infrared analysis, optical parameters and Electrical properties have been thoroughly investigated. It was found that, both density and molar volume increased with the gradual replacement of B 2O 3 by Bi 2O 3 and the comparison between their experimental and empirical values confirm the amorphous nature and the random structure of all samples. The obtained infrared results indicated that different structural borate groups appeared such as BO4 units (in di-, tri- and penta-borate groups) and BO 3 units (in meta- and ortho-borate chains). Also, both BiO 3 and BiO 6 are present in all Bi doped glasses, and the BiO 3 / BiO 6 ratio appeared to be approximately stable as Bi 2O 3 was increased to 15 mol%, then it showed a jump increase when BiO 3 reached 20 mol%. The optical band gap energy and cut-off wavelength increased with the increase of Bi 2O 3 while Urbach energy decreased. On the other hand, the electrical conductivity decreased as Bi 2O 3 was gradually replaced by B 2O 3, while the activation energy increased and all samples exhibit semi-conductors behavior and the values of the exponent factor decreased gradually with temperature, which is compatible with the correlated barrier hopping conduction mechanism.
%K Sodium-Borate Glasses
%K FTIR
%K Optical Parameters
%K AC Conductivity
%U http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=309&doi=10.11648/j.ajae.20180501.11