Electrical conductivity of the ionic conductor tetragonal (Bi2O3)1-x(Eu2O3)x

Abstract

Electrical conductivity of tetragonal β-phase (Bi2O3)1-x(Eu2O3)x (0.01 ≤ x ≤ 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 ºC) for the β-phase at 670 ºC and 0.57 Ω-1cm-1 (x=0.05, 800 ºC) in binary systems at 690 ºC. 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.

γ-Phase stabilized Bi4BaxV2−xO11−δ (0.0 ≤ x ≤ 0.20): Structural, thermal and conducting properties

“…In consequence, the total conductivity of the material decreases [17,44,45]. Value of conductivity not only depends on the number of oxygen vacancies generated, but also on the ratio of ionic charge and size of the dopant cations called ionic potential (∅) [46]. Actually, the higher the ionic potential of an atom, the greater its polarizing power.…”

Comparative study on photocatalytic performances of crystalline α- and β-Bi2O3 nanoparticles under visible light

“…Additionally, Bi 2 O 3 photocatalyst is considered to be safe, nontoxic, and noncarcinogenic [24,25]. Bi 2 O 3 has six main crystallographic polymorphs denoted by a-(monoclinic), b-(tetragonal), g-(cubic, bcc), d-(cubic, fcc), e-(orthorhombic), and v-Bi 2 O 3 (triclinic) phases [26][27][28]. Stable phases are a-and d-Bi 2 O 3 , while the others are high-temperature metastable phases [29].…”

Effect of two different dopants (Mg2+ and Ca2+) and processing parameters on γ-phase stabilization and conductivity of Bi4V2O11−δ

“…Actually, with the increase in temperature the thermal vibration energy of the oxide ion increases. This increases the movement of oxide ion movement and hence the conductivity of the samples [30]. Interestingly, the magnesium doped samples clearly show the three regions as marked in Fig.…”

“…This phenomenon is associated with defect association and clustering with the increase in amount of doping. Also, the ordering in oxygen vacancies could have taken place with the increase in the number of oxygen vacancies with the doping amount [30]. The variation of conductivity with temperature was estimated from ln (σT) vs. 1000/T graphs [31,32].…”