Mixed electronic–ionic conductivity in transition metal oxide glasses containing alkaline ions

Electronic and ionic conductivity studies on microwave synthesized glasses containing transition metal ions

“…A similar trend is seen in glasses containing both alkali oxide and TMO's [33][34][35][36]. The other possible explanation for the observed conductivity is that polaron percolation paths are blocked by alkali ions in alkali rich glasses [33][34][35][36].…”

Electrical conductivity of iron-bearing silicate glasses and melts. Implications for the mechanisms of iron redox reactions

“…In such oxidized glasses, most alkali cations should serve as charge compensators for tetrahedral Fe 3+ (see Mysen and Richet, 2005). As a result, their mobility is likely so low that they do not contribute significantly to electrical conductivity (Barczynski and Murawski, 2002;Tsuchiya and Noshimura, 1989). Given that Fe 3+ is likely much less mobile than either alkali or alkaline earth cations, the high conductivity contrast between oxidized and reduced samples should result from an important electronic contribution to the conductivity of the former.…”

(FeNaP)<sub>2</sub>O<sub>9</sub> Glasses Doped with Different TM Ions

“…Glasses of the composition 50 mol% P 2 4 , CuO and ZnO were prepared by the melting quenching method. All glass samples were prepared from chemicals with 99.99% purity as starting materials.…”

“…The majority of the experimental measurements have carried out on vanadate glasses [2]. Oxide glasses containing high percentages of iron [3] and copper [4], [5] have a great interesting because copper ions serve not only as a shopping center, but they also contribute in the ionic conductivity. Iron phosphate glasses were found to behave as a typical semiconductor and exhibit unusually a good chemical durability.…”