Effect of CaO/SiO2 molar ratio on the electrical and physical properties of basaltic glass materials

• Published in: Heliyon 2019-02, Vol.5 (2), p.e01248-e01248, Article e01248
• Main Authors: Khater, G.A., Gomaa, Mohamed M., Kang, Junfeng, Mahmoud, M.A.
• Format: Article
• Language: English
• Subjects: Condensed matter physics; Materials science
• ISSN: 2405-8440; 2405-8440
• DOI: 10.1016/j.heliyon.2019.e01248

The effect of CaO∖SiO2 molar ratio on the electrical properties of some glass materials was examined, using the impedance spectroscopy, at different frequency ranges, from 100 Hz up to 5 MHz. Also, a trial was accomplished to study the influence of CaO∖SiO2 molar ratio on some physical properties such as density, micro-hardness and bending strength. Six glass batches, based on Sinai basaltic rocks and bypass cement dust, were prepared with different CaO/SiO2 molar ratios (0.2–0.93 mol %). Accordingly, the electrical properties (conductivity dielectric constant and dielectric loss) of these samples show noticeable change. Electrical results show that the samples with relatively low (CaO/SiO2) molar ratio have relatively higher electrical conductivity, compared to the other samples with higher (CaO/SiO2) molar ratios, at different frequencies. Also, at the same time, the bending strength and Vickers micro-hardness show a gradual increase from 56 to 118 MPa and from 4020 to 6120 MPa, respectively, with decreasing CaO/SiO2 molar ratio. The density of the samples shows a successive increase from 2.79 to 2.96 gm/cm3 with the successive additions of bypass cement dust.