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