β-alumina type ionic conductors were synthesized in the SrO-MgO-Al2O3 system by a direct sintering method and their electrical conductivity was measured at 873 to 1373 K by an a.c. impedance method in order to apply the β-alumina to solid electrolyte of a gas sensor at high temperatures. Sr β-aluminas in a single phase were obtained in the composition range of SrO : MgO : Al2O3=1 : 1 : 4.8-5.2. The bulk and grain boundary conductivities were separated from the total conductivity at SrO : MgO : Al2O3=1 : 1 : 4.8 and 1 : 1 : 5.0. The bulk conductivity of the Sr β-alumina was around 6.7 × 10-3 S·m-1 at 1373 K.
|Number of pages||5|
|Journal||Journal of the Ceramic Society of Japan|
|Publication status||Published - 1997 Dec|
- Complex impedance
- Electrical property
- Ionic conductor