Electrical conductivity of the ionic conductor tetragonal (Bi 2O3)1-x(Eu2O3) x

Abstract

Electrical conductivity of tetragonal β-phase (Bi2O 3)1-x(Eu2O3)x (0.01 ≤ × ≤ 0.10 %mol) ceramic systems were investigated. The temperature and doping concentration dependences of the electrical conductivity were studied by four-point probe technique. The electrical conductivity increases with the increasing doping concentration and temperature. The highest value of the electrical conductivity is 0.013 Ω-1cm-1 (x = 0.05, 750 °C) for the β-phase at 670 oC and 0.57 Ω-1cm -1 (x=0.05, 800 °C) in binary systems at 690 °C. The phase transition which manifests itself by the jump in the conductivity curves was seen and verified by differential thermal analysis measurements. The activation energies of the samples were found to be about 0.71-1.57 eV.