Structural Inversion and Behavioural Changes as a Function of Composition in Sr-La-Al-B-Si Based Glasses

Prasanta Kumar Ojha, Sangram K. Rath, Tapas K. Chongdar, Nitin M. Gokhale, Ajit R. Kulkarni

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Naval Materials Research Laboratory, Ambernath, Thane, Maharashtra, India.

DOI: 10.4236/njgc.2011.12004                

Abstract

A series of glass sealants for solid oxide fuel cell (SOFC) with compositions SrO (x wt %) La₂O₃ (15 wt %) Al₂O₃ (15 wt %) B₂O₃ (40-x wt %) SiO₂ (30 wt %) [x = 10, 15, 20, 25 & 30] [SLABS] have been investigated by quantitative Fourier Transform Infrared Spectroscopy (FTIR). Structural findings from FTIR reveal that with increasing substitu-tion of B₂O₃ by SrO, even though the B₂O₃/SiO₂ ratio decreases, however the Si-O- non-bridging bond content in the matrix is increasing and glass structure is getting more inverted. UV-Vis Diffused Reflectance Spectroscopy (UV-Vis-DRS) of the glass series shows that electrical band gap of glasses decreases in the series from 3.07eV to 2.97eV with increasing substitution from x = 10 to x = 30. Conductivities of the glass samples were measured by AC impedance spectroscopy and found to be increasing from 2.74 × 10^-5 Scm^-1 to 1.09 × 10^-4 Scm^-1 with increasing substitution from x =10 to x = 30.

Keywords

Glass Ceramics, Mullite Ceramics Thin Tile, Composites, Bending Strength

Conflicts of Interest

The authors declare no conflicts of interest.

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