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