{HEAD ~ A process} 14, wherein the sintering step includes sintering in {TAIL ~ an N2 /H2 atmosphere} 
{ HEAD ~ A process } 14 , wherein the sintering step includes sintering in { TAIL ~ an N2 /H2 atmosphere }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL