Influence of alkaline earth modifiers on the physical, thermal and electrical properties of boroaluminosilicate glasses

• Published in: Journal of materials science. Materials in electronics Vol. 35; no. 14; p. 991
• Main Authors: Nath, R. Devika, Gopakumar, N., Rajesh, S., Anjana, P. S.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2024; Springer Nature B.V
• Subjects: Aluminum oxide; Barium; Boron; Boron oxides; Characterization and Evaluation of Materials; Chemistry and Materials Science; Density; Dielectric properties; Dielectric strength; Differential thermal analysis; Electrical properties; Electrical resistivity; Electron micrographs; Electronic packaging; Fuel cells; Glass transition temperature; Materials Science; Molar volume; Optical and Electronic Materials; Physical properties; Physics; Refractivity; Room temperature; Sealants; Silicon dioxide
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-024-12651-z

Boroaluminosilicate glasses have been used extensively due to its versatile applications considering its worthwhile features like high dielectric strength, comparatively low refractive index, high softening temperatures etc. In this paper, (25 −  x )SrO– x BaO–B 2 O 3 –SiO 2 –Al 2 O 3 (mol%) [0 ≤  x  ≤ 25] glasses have been synthesized using normal melt quench technique. The influence of Sr/Ba ratio in physical and electrical properties has been analysed and it is observed that as we increase the barium content, the density and molar volume of the glasses increase. The measured density increased from 3.54 to 3.85 g/cm 3 , whereas the molar volume increases from 24.37 to 25.66 cm 3 /mol. The glasses exhibited CTE values in the range (12.7–13.4) × 10 –6 /K and calculated theoretical values of viscosity fall in the range 10 6 to 10 9 dPa s, which makes the glasses suitable for sealant applications in fuel cells. The dense compact structure of the glasses has been observed from the scanning electron micrographs (SEM) and elemental compositional analysis was done using energy-dispersive X-ray (EDX) analysis. The glass transition temperatures are identified from differential thermal analysis. Dielectric measurements and conductivity analysis have been conducted for the samples from room temperature up to 600 °C. The value of dielectric constant at 600 °C is observed to be 67.4, 37.4 and 31.1 for the glass system having 25, 15 and 5 wt% of Ba. Similarly, the loss tangent values observed are 0.08, 0.09 and 0.09 for the 25,15 and 5 wt% Ba added systems at 600 °C. The values of a.c electrical conductivity are 17.65 × 10 –8 S/cm, 39.07 × 10 –8 S/cm and 18.67 × 10 –8 S/cm, respectively, for glass system having 25, 15 and 5 wt% of Ba. The measured electrical and physical properties indicate that the glasses are potential candidate to be used for electronic packaging as well as fuel cell sealant.