The preparation and electrical conductivity of
-
are investigated as a function of
content from the-oretical composition of
-
to that of
"-
.
-
"
-Al2O3 and
-NaAlO2 phases appear in the calcined powder at 125
for 2 hours. The majoity phase is
-
in sintered specimens at 155
and 1
for 30 mins respectively and
-
phase also exists when Na2O content is over 10.39w/o
-
phase does not affect the grain growth of
-
in sintering at 155
but acts as a reactive liquid for the abnormal grain growth of
-
in sintering at 1
The electrical conduction of
-
is predominated by
ion. Contribution of ionic con-ductivity to total conductivity is gradually decreased with increasing temperature at given oxygen pressure and to -tal conductivity is increased by positive hole due to interstitial oxygen with increasing oxygen pressure.
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