Abstract
In this work, we have prepared 22 barium aluminoborate glass compositions and investigated their thermo-optical and structural properties. The non-hygroscopic glass composition (71−x) B2O3:(20+x) BaO:9 Al2O3 with x = 0, 5, 10, 15, and 20 (%mol) presented high transparency in the visible to near-infrared region of about 80%. X-ray diffraction patterns have shown no crystalline phase and indicated a structural change feature. As BaO content increases from 20 to 40 mol%, the density increased from 2.82 to 3.696 g/cm3 whereas Vickers hardness decrease from HV = 5.3 to 4.2 GPa. The FTIR curves indicate three main regions concerning BOB, BO4, and BO3 units. Refractive index measured at 546 nm varied from 1.5611 to 1.6371, whereas dn/dT remained almost constant i.e. 1.69×10−5°C−1. Thermal Diffusivity obtained by thermal lens technique indicated a decreased from 3.4 to 2.8 cm2×10−3/s as BaO is added to the glass compositions. The results indicate that non-bridging oxygen plays an important effect on glass physical properties.
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