Spinel type MgAl2O4 is substituted into {HEAD ~ a basic spinel structure} for {TAIL ~ structural stability} 
for
Spinel type MgAl2O4 is substituted into { HEAD ~ a basic spinel structure } for { TAIL ~ structural stability }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL