Abstract
Fluoroborate glasses with Bi2O3 content and having compositions xBi2O3 · (40-x)LiF · 60B2O3 (x = 0, 5, 10, 15, and 20) are prepared using melt-quench technique. DSC characterization is carried out to observe glass transition temperature. Two such temperatures are observed for each of the reported samples. DC conductivity of the reported samples is studied with the variation in temperature from 313 K to 413 K by dividing this range into three regions, namely, low-, intermediate-, and high-temperature regions. DC conductivity responses for these temperature regions are explained using different conductivity models.
Highlights
Fluoroborate glasses have attracted the attention of researchers in the recent times due to their wide application range
One is the study of glass transition temperatures by Differential scanning calorimetry (DSC) technique and the other is the study of temperature dependence of DC conductivity in different temperature regions
Tg1 increases with the increase in the Bi2O3 content which is attributed to the strengthening of the structure caused by the Bi2O3 by entering the glass network and showing its glass-forming character
Summary
Fluoroborate glasses have attracted the attention of researchers in the recent times due to their wide application range. The difference in the glass transition temperature (Tg) and crystallization temperature (Tc) indicates the stability of the glass [6]. Many of them have reported two or even three crystallization temperatures. The presence of two different kinds of ions in glass structure become responsible for electronic and ionic conductivities to dominate in different temperature ranges [15]. Shaaban [16] has recently reported charge transport properties of (70 − x)B2O3 ⋅ 15Bi2O3⋅ 15LiF ⋅ xNb2O5 glasses. Some interesting results are obtained for the dependence of DC conductivity on temperature. Obtained, there are two models applicable in two different temperature ranges. One is the study of glass transition temperatures by DSC technique and the other is the study of temperature dependence of DC conductivity in different temperature regions
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