Nearly constant loss effects in borate glasses
Abstract
Different nearly constant loss phenomena are investigated in borate glasses with compositions xNa2O·(1−x)B2O3, for 0 ≤x≤ 0.3. The ionic conductivities caused by these effects are studied in wide ranges of temperature and frequency, spanning 4.3 K to 573 K and 100 mHz to 1 MHz, respectively. In a first step, we show how to identify the nearly constant loss (NCL) in 0.3Na2O·0.7B2O3 glass. In the procedure, the scaling property of the conductivity caused by ordinary hopping is used to remove this component from the total conductivity as measured as a function of temperature at fixed frequency. The resulting NCL component is seen to be proportional to frequency and to display no temperature dependence. In a second step, a broad-band relaxation process is shown to exist in amorphous boron oxide and in
- This article is part of the themed collection: Physical chemistry of solids - The science behind materials engineering