Abstract
Polycrystalline ceramic samples of magnesia doped GdSm 1-xMg xZr 2O 7-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 GdSm 1-xMg xZr 2O 7-x/2 ceramics are investigated. Magnesia doping promotes the sintering densification behaviour of GdSm 1-xMg xZr 2O 7-x/2 ceramics. GdSm 1-xMg xZr 2O 7-x/2 (x50, 0.05, 0.10) ceramics have a single phase of the pyrochlore type structure, while GdSm 1-xMg xZr 2O 7-x/2 (x50.15, 0.20) ceramics consist of the pyrochlore type structure and a small amount of magnesia as the second phase. The total conductivity of GdSm 1-xMg xZr 2O 7-x/2 ceramics obeys the Arrhenius relation, and gradually increases with increasing temperature from 723 to 1173 K. GdSm 1-xMg xZr 2O 7-x/2 ceramics are oxide-ion conductors in the oxygen partial pressure range of 1.0×10 -4 to 1.0 atm at each test temperature. The maximum value of the total conductivity is 1.29×10 -2 S cm -1 at 1173 K for the GdSm 0.85Mg 0.15Zr 2O 6.925 ceramic.
| Original language | English |
|---|---|
| Pages (from-to) | 214-219 |
| Number of pages | 6 |
| Journal | Advances in Applied Ceramics |
| Volume | 111 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - May 2012 |
| Externally published | Yes |
Keywords
- Electrical conductivity
- GdSm Mg Zr O
- Impedance spectroscopy
- Solid electrolyte
- Structure