Each particle is covered with {HEAD ~ an insulative oxide film} which contains {TAIL ~ 0.3 to 0.8%} of oxygen by weight based on the particle 
contains
Each particle is covered with { HEAD ~ an insulative oxide film } which contains { TAIL ~ 0.3 to 0.8 % } of oxygen by weight based on the particle
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH