Abstract
Nanocomposites electrolytes consisting of La3+ and Zr4+ doped with ceria labelled as La0.2 Ce0.8 O2-δ (LDC), Zr0.2Ce0.8O2-δ (ZDC) and Zr0.2La0.2Ce0.6O2-δ (ZLDC) have been synthesized via a co-precipitation route. DC conductivity was studied with a four-probe method in the range of temperature 450–650 °C and maximum conductivity was found to be 0.81 × 10−2 S.cm−1 (LDC) > 0.32 × 10−2 S.cm−1 (ZLDC) > 0.15 × 10−2 S.cm−1 (ZDC) at a temperature of 650 °C, respectively. Further, electric behavior of doped and co-doped ceria electrolytes was investigated by A.C electrochemical impedance spectroscopy (frequency range ~ 0.1 Hz 4 MHz). The phase/
structural identification of the material prepared was studied using X-ray diffraction and found ceria to possess a cubic fluorite structure. Scanning electron microscopy (SEM) was carried out to study its morphology and particle
size (~ 90–120 nm). Thermal behavior on its change in weight and length with the temperature were studied by thermogravimetric analysis (TGA) and dilatometry respectively. Furthermore, thermal expansion coefficients
(TECs) of prepared electrolytes are calculated and found as follows: 13.4 × 10−6 °C−1, 13.6 × 10−6 °C−1and 5.3 × 10−6 °C−1 for LDC, ZDC and ZLDC, respectively, in the temperature range 150–1150 °C.
Original language | English |
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Pages (from-to) | 6493-6499 |
Journal | Ceramics International |
Volume | 44 |
Issue number | 6 |
Early online date | 9 Jan 2018 |
DOIs | |
Publication status | Published - 15 Apr 2018 |
Keywords
- doped ceria
- co-doped ceria
- electrolyte
- lanthanum
- zirconium
- ionic conductivity
- thermal expansion coefficient