Dielectric properties of quaternary calcium aluminoborosilicate system glasses

Authors: Yue, Y. L.; Yu, X. J.; Wu, H. T.; Chen, X. J.

Source: Materials Research Innovations, Volume 13, Number 2, June 2009 , pp. 129-132(4)

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Abstract:

Series of alkaline earth aluminoborosilicate glasses were prepared by conventional melt quenching technique. Several studies including infrared spectra, density and dielectric properties of these glasses have been carried out. Infrared spectra indicated that with increasing boron oxide, more borate units were connected with silicate and aluminum units, that with decreasing calcium oxide, less dangling bonds along with non-bridging oxygen ions and more strong bonds like B–O–Si and B–O–Al formed, and that the glass structure was tightened. Capacitance decreased with increasing frequency, and relative dielectric constant ?? and dielectric loss tan ? at 1 MHz decreased with increasing boron oxide content at the expense of calcium oxide. The decrease in capacitance with frequency was attributed at low frequency, to polarisability arising from electronic, ionic and orientational components, while at higher frequencies, the orientational polarisability is nearly absent. The total polarisability of glass decreased due to the lower polarisability of B³⁺ cations and oxygen anions in boron oxide in comparison with calcium oxide.

Keywords: OPTICAL BASICITY; DIELECTRIC PROPERTIES; ALUMINOBOROSILICATE; INFRARED SPECTRA

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/143307509X435141

Publication date: 2009-06-01

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