Abstract
The oxygen stoichiometry of CeO2 and Ce0.82Gd0.18O1.91 is determined by a combination of cyclic voltammetry and coulometric titration. The electrochemical cell employed is an oxygen pumping cell, in which the oxide is subjected to different oxygen pressures corresponding to the potential imposed in the temperature range 800-1000 degrees C. With scan rates of 2 mu V/s potential sweeps on CeO2 are reversible. The change in entropy is determined by either subtraction of e.m.f. curves obtained by potential sweeps of different temperatures or by measuring the e.m.f. during a temperature scan. The latter method yields the most reliable results. Potential sweeps on Ce0.8Ca0.2O1.8 suggest that calcium is expelled from the lattice.
| Original language | English |
|---|---|
| Journal | Solid State Ionics |
| Volume | 86-88 |
| Pages (from-to) | 725-731 |
| ISSN | 0167-2738 |
| DOIs | |
| Publication status | Published - Jul 1996 |
| Event | 10th International Conference on Solid State Ionics (SSI-10) - Singapore, Singapore Duration: 3 Dec 1995 → 8 Dec 1995 Conference number: 10 |
Conference
| Conference | 10th International Conference on Solid State Ionics (SSI-10) |
|---|---|
| Number | 10 |
| Country/Territory | Singapore |
| City | Singapore |
| Period | 03/12/1995 → 08/12/1995 |
| Sponsor | National University of Singapore |
Keywords
- oxygen stoichiometry
- cyclic voltammetry