THE EFFECT OF THE NATURAL RAW BARITE AND THE DOLOMITE MATERIAL ON BORATE GLASS FORMATION

Abstract

The Barite mineral from Ain Mimoun (khenchela-Algeria) and the Dolomie mineral from the Jebel Taioualet (Oum El Bouaghi-Algeria), are used as raw materials to form glass. Glasses in the system 70H3BO3+x BaSO4{Barite}+(30-x)CaMg(CO3)2{Dolomie} (0≤x≤15 mol%), have been prepared by the melt quenching technique . Glasses have been investigated by X-ray diffraction, infrared and optical absorption in addition tothe differential thermal analysis (DTA). In FTIR spectroscopy, the fundamental stretching and bending vibrations are observed in the infrared region for BO3, BO4, M-O (M=metal), OH and SO4. The thermal decomposition behaviors determined by means of the differential thermal analysis (DTA). The results proved that, the density, the molar volume and BO4/total BO groups ratio of glasses increase with the increasing BaO concentration, and the UV cut off shift to higher wavelength, while the glass transition temperature and the optical band gap decrease with the augmentationof BaO concentration.