Abstract
Polycrystalline ceramic samples of magnesia doped GdSm1-xMg xZr2O7-x/2 have been prepared by conventional solid state reaction method using high purity oxides. The influence of magnesia dopant content on densification, microstructure and electrical properties of GdSm1-xMgx Zr2O7-x/2 ceramics are investigated. Magnesia doping promotes the sintering densification behaviour of GdSm1-xMg xZr2O7-x/2 ceramics. GdSm1-xMgx Zr2O7-x/2 (X=0, 0.05, 0.10) ceramics have a single phase of the pyrochlore type structure, while GdSm1-xMg xZr2O7-x/2 (X=0.15, 0.20) ceramics consist of the pyrochlore type structure and a small amount of magnesia as the second phase. The total conductivity of GdSm1-xMgx Zr2O 7-x/2 ceramics obeys the Arrhenius relation, and gradually increases with increasing temperature from 723 to 1173 K. GdSm1-xMgx Zr2O7-x/2 ceramics are oxide-ion conductors in the oxygen partial pressure range of 1.0X10-4 to 1.0 atm at each test temperature. The maximum value of the total conductivity is 1.29X10-2 S cm -1 at 1173 K for the GdSm0.85Mg0.15Zr2O6.925 ceramic.
| Original language | English |
|---|---|
| Pages (from-to) | 214-219 |
| Number of pages | 6 |
| Journal | Energy Materials: Materials Science and Engineering for Energy Systems |
| Volume | 7 |
| Issue number | 3 |
| Publication status | Published - 2012 |
| Externally published | Yes |
Keywords
- Electrical conductivity
- GdSmMg ZrO
- Impedance spectroscopy
- Solid electrolyte
- Structure
