Abstract
Dielectric constant ( ɛ′), loss (tan δ), ac conductivity ( σ) of CaO–Sb 2O 3–B 2O 3:M 2O 3 (Al 2O 3, Ga 2O 3 and In 2O 3) glasses with varying concentrations of M 2O 3 (0–5 mol%), were measured as a function of frequency and temperature over moderately wide ranges. The analysis of results of these studies along with IR, Raman and optical absorption spectra and also DTA studies indicated that in the concentration ranges, 0 ≤ Al 2O 3 ≤ 4, 0 ≤ Ga 2O 3 ≤ 2 and 1 ≤ In 2O 3 ≤ 5, Al 3+, Ga 3+ ions occupy tetrahedral positions whereas In 3+ ions take up octahedral substitutional positions, cross-link with the other structural units in the glass network and increase the rigidity of the glass network.
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