{HEAD ~ A positive active material} for nickel electrodes of alkaline storage batteries consists of particles of hydroxide containing mainly nickel and covered with a layer of a hydroxide phase based on nickel and {TAIL ~ yttrium} 
{ HEAD ~ A positive active material } for nickel electrodes of alkaline storage batteries consists of particles of hydroxide containing mainly nickel and covered with a layer of a hydroxide phase based on nickel and { TAIL ~ yttrium }
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