Abstract
β-phase (Bi2O3)1-x(Dy2O3)xsystem with tetragonal structure is synthesized for0.01<x<0.10molar doping. Unit cell parameters increased with increasing the doping. We have studied the dependence of total electrical conductvity on temperature, doping concentration ofβ-phase systems. The phase transition which manifests itself by the jump in the conductivity curve was also verified by DTA and both measurements are rather compatible. The electrical conductivity curves ofβ-phase structure revealed regular increase in the form of an Arrhenius curve. The activation energies are calculated from these graphs.Bi2O3-basedDy2O3doped ceramics show ionic oxygen conductivity. The conductivity increased as the doping concentration increased. The highest value of conductivity is 0.006 0.006ohm-1cm-1(600∘C)for theβ-phase (Bi2O3)0.91(Dy2O3)0.09(800∘C). The sample with the highest conductivity is (Bi2O3)0.91(Dy2O3)0.09(800∘C)binary system where 1.450 ohm−1cm−1(745∘C).
Highlights
Bi2O3 polimorphs can be used in SOFC applications and oxygen detectors since their oxygen ionic conductivity is higher than that of Zirconia (ZrO2)-based electrolytes at the same temperature [1,2,3]
The solid mixtures were synthesized via solid-state reactions
The unit cell parameters are observed to increase as the doping concentration increases
Summary
Bi2O3 polimorphs can be used in SOFC applications and oxygen detectors since their oxygen ionic conductivity is higher than that of Zirconia (ZrO2)-based electrolytes at the same temperature [1,2,3]. In the synthesis of Bi2O3 phsases, the parameters like the dopant, stoichometric rate of the dopant, heat treatment time, heat treatment temperature, cooling rate, grinding time and number of grindings, the grain size, and so on are important [7,8,9] These variables affect the structural characteristics such as unit cell constants [3, 7,8,9]. It is extensively reported that the Arrhenius curves have two regimes in oxygen ionic materials [2, 3, 14]. This indicates a change or a phase transition in the conductivity mechanism
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