An investigation was made of mullite as a solid electrolyte at high temperatures. The predominantly ionic conduction of mullite was characterized by measuring the temperature dependence of the ionic transference number (tables 8 and 9). It was confirmed that mullite exhibited an ionic conductivity which was superior to that of CaO-stabilized ZrO2 solid electrolytes at temperatures ranging from 1400 to 1600C.
I.Rommerskirchen, F.Chávez, D.Janke: Solid State Ionics, 1994, 74[3-4], 179-87
Table 8
Ionic Transference Number of Mullite
PO2(bar) |
Temperature(C) |
Number
|
10-30 |
1400 |
0.00491 |
10-30 | 1600 | 0.000474 |
10-25 | 1400 | 0.0806 |
10-25 | 1600 | 0.00837 |
10-20 | 1400 | 0.609 |
10-20 | 1600 | 0.131 |
10-15 | 1400 | 0.965 |
10-15 | 1600 | 0.727 |
10-10 | 1400 | 0.998 |
10-10 | 1600 | 0.979 |
10-5 | 1400 | 1 |
10-5 | 1600 | 0.999 |
Table 9
Ionic Transference Number of Mullite
with 4mol% Excess Alumina
PO2(bar) |
Temperature(C) |
Number
|
10-30 |
1400 |
0.0375 |
10-30 | 1600 | 0.000802 |
10-25 | 1400 | 0.409 |
10-25 | 1600 | 0.0141 |
10-20 | 1400 | 0.925 |
10-20 | 1600 | 0.202 |
10-15 | 1400 | 0.995 |
10-15 | 1600 | 0.819 |
10-10 | 1400 | 0.9997 |
10-10 | 1600 | 0.988 |
10-5 | 1400 | 1 |
10-5 | 1600 | 0.999 |