wherein {TAIL ~ the specific microstructural portion} is present in a first plurality of particles which are provided with a casing where the specific microstructural portion is aluminum or aluminum and chromium and {HEAD ~ the casing} consists of a metal or a metal oxide, 
wherein { TAIL ~ the specific microstructural portion } is present in a first plurality of particles which are provided with a casing where the specific microstructural portion is aluminum or aluminum and chromium and { HEAD ~ the casing } consists of a metal or a metal oxide ,
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH