Study on the properties of Bi2O3-B2O3-BaO lead-free glass using in the electronic pastes

The Sb2O3 doping lead-free glass in Bi2O3-B2O3-BaO ternary system were prepared in the composition of several different subsystem, and the glass powder was produced through the process of water quenching. Glass transition temperatures (T (g) ), glass soften temperatures(T (s) ), the volume resistivity (rho) in the temperature range of 80-200A degrees C, and linear thermal coefficients of expansion in the temperatures range of 25-300A degrees C (alpha(25-300)) were measured for subsystems along with the different ratio of Bi2O3, B2O3 and BaO. For these subsystems, T (g) ranged from 458 to 481A degrees C, and T (s) ranged from 490 to 512A degrees C, both decreasing with the increasing of Bi2O3/B2O3 ratio, and increasing with the increasing of BaO/B2O3 ratio. The measured alpha(25-300) ranged from 65.3 to 76.3 x 10(-7) K-1, with values increasing with increasing Bi2O3/B2O3 and BaO/B2O3 ratio. The volume resistivity remains at a high standards, which may caused by it's non-alkali composition, and it fluctuated from 10(13) to 10(11) Omega cm with the temperature varied from 80-200A degrees C. The structure of Bi2O3-B2O3-BaO ternary leadfree glass system was mearsured by FT-IR. The IR studies indicate that these glasses are made up of [BiO6], [BO3], and [BO4] basic structural units, and it appears that Ba2+ acts as a glass-modifier in this ternary system, but the Bi3+ has entered the glass network when it is in relative high content so as to change the alpha(25-300), T (s) and T (g) .