The invention provides a method of making β alumina by heating aluminium oxide in {HEAD ~ the presence} of {TAIL ~ Na2 O} 
of
The invention provides a method of making β alumina by heating aluminium oxide in { HEAD ~ the presence } of { TAIL ~ Na2 O }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL