PHLEGMATIZED METAL POWDER OR ALLOY POWDER AND METHOD AND REACTION VESSEL FOR THE PRODUCTION THEREOF

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The rare earth metals production process produces powder of average grain size below 20 mu m of zirconium, titanium or hafnium by metallic thermal reduction of oxides or halogenides. A passivating gas is added during and/or after the reduction to stabilize the powder. A passivating solid is supplied before the reduction. Reduction and stabilization take place in a single vacuumable gastight reaction vessel.