The electrical properties of glasses in the AgI-As 2 Te 3 system are investigated by impedance spectroscopy and the Wagner and Tubandt methods. The glasses containing more than 40 mol % AgI possess a mixed electronic-ionic conductivity. It is found that the introduction of the ionogenic component suppresses hole conduction in the glass.
The electrical conductivity of glasses in the Ag-As-Te-Se system is investigated by impedance spectroscopy for compositions lying along two joins, namely, Ag 0.2 -As 0.4 -(Te x -Se 1x ) 0.4 and (Ag 2 Se) 0.2 -[(As 2 Te 3 ) x -(As 2 Se 3 ) 1x ] 0.8 . The transport numbers are measured using the Wagner method. It is found that, in the glasses containing silver in large amounts, the electron-hole conduction is predominantly provided by electrons rather than by holes, as is usually observed in chalcogenide glasses.
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