The chemical constituent is slowly removed from the primary reactant by {TAIL ~ the reaction} of the chemical constituent vapor with a secondary reactant, spatially separated from the primary reactant, in a closed volume under uniaxial pressure and {HEAD ~ heat} to form the single phase pure crystals 
The chemical constituent is slowly removed from the primary reactant by { TAIL ~ the reaction } of the chemical constituent vapor with a secondary reactant , spatially separated from the primary reactant , in a closed volume under uniaxial pressure and { HEAD ~ heat } to form the single phase pure crystals
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