Magnetite particles 1, wherein {TAIL ~ the specific surface area} of {HEAD ~ the magnetite particles} by the BET method is given by the equation 
Magnetite particles 1 , wherein { TAIL ~ the specific surface area } of { HEAD ~ the magnetite particles } by the BET method is given by the equation
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH