Thermal properties of barium titanium borate glasses measured by thermal lens technique

In this paper, thermal lens spectrometry was used to determine the thermal properties of barium titanium borate glasses as a function of the amount of TiO2 in the ratios 8/9 and 1/1 of BaO–B2O3. The thermal lens technique was shown to be sensitive to the variation of TiO2 and the ratio of BaO/B2O3, through thermal diffusivity and conductivity, with different behavior for the ratios 1/1 and 8/9. An increase in thermal diffusivity and conductivity as a function of TiO2 was observed, and this behavior was ascribed to the fact that titanium acts as a glassy-former, being more active in the ratio 8/9.