Effects of CaO Additions on the Structure and Dielectric Properties of Aluminoborosilicate Glasses

Abstract:

Glasses with compositions xCaO-(60-x)SiO₂-5MgO-15Al₂O₃-20B₂O₃ (x=0, 3, 6 and 9 mol %) were prepared by conventional melting method. Fourier-transform infrared spectroscopy (FTIR) indicated that the addition of CaO converted trigonal boron (^[B) to tetrahedral boron (^[B). The glass transition temperatures (T_g) were determined using a differential scanning calorimetry (DSC). T_g increased with increasing CaO content. Thus, the addition of CaO instead of SiO₂ strengthened the glass network. The dielectric ε_r and loss tanδ were measured for the MgO-B₂O₃-Al₂O₃-SiO₂ glass system in the frequency range 10³-10⁵ Hz. The decrease in ε_r and tanδ could be attributed to the increase in the rigidity of the glass network.

• Periodical: Advanced Materials Research (Volume 710)
• Pages: 127-131
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.710.127
• Online since: June 2013
• Authors: X.M. Yuan, S.M. Lu, X.H. Zhang, Y.J. Cui, H.T. Wu, Y.L. Yue
• Keywords: Aluminoborosilicate, Dielectric Property, Glass Transition Temperature, Structure

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