The proportion of the hydroxide phase is in the range 0.15% to 3% by {HEAD ~ weight} of {TAIL ~ yttrium} expressed as yttrium hydroxide relative to the total weight of particles 
of
The proportion of the hydroxide phase is in the range 0.15 % to 3 % by { HEAD ~ weight } of { TAIL ~ yttrium } expressed as yttrium hydroxide relative to the total weight of particles
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH