{HEAD ~ Na2 O} is then dispersed in {TAIL ~ the calcined starting mixture} to form a final mixture, and the final mixture is heated in an oxygen containing atmosphere to above 1100° C. to produce β alumina 
is dispersed in
{ HEAD ~ Na2 O } is then dispersed in { TAIL ~ the calcined starting mixture } to form a final mixture , and the final mixture is heated in an oxygen containing atmosphere to above 1100 ° C. to produce β alumina
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH