H. Gang et al., PREPARATION OF SR BETA-ALUMINA IONIC CONDUCTORS AND THEIR AC-IMPEDANCE MEASUREMENTS, Nippon Seramikkusu Kyokai gakujutsu ronbunshi, 105(12), 1997, pp. 1067-1071
beta-alumina type ionic conductors were synthesized in the SrO-MgO-Al2
O3 system by a direct sintering method and their electrical conductivi
ty was measured at 873 to 1373 K by an a.c. impedance method in order
to apply the beta-alumina to solid electrolyte of a gas sensor at high
temperatures. Sr beta-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 conductiv
ity at SrO : MgO : Al2O3=1 : 1 : 4.8 and 1 : 1 : 5.0. The bulk conduct
ivity of the Sr beta-alumina was around 6.7 x 10(-3) S.m(-1) at 1373 K
.