{TAIL ~ The bead} may optionally be converted to a phosphate or other desired phase by hydrothermal treatment after {HEAD ~ gelation} and prior to sintering 
{ TAIL ~ The bead } may optionally be converted to a phosphate or other desired phase by hydrothermal treatment after { HEAD ~ gelation } and prior to sintering
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH