Technology to remove oxygen from niobium metal is reviewed. The small
amount of oxygen in BCC niobium causes the embrittlement, the increase of
electroresistivity, the lower heat conductivity etc. The methods for deoxidation
of niobium are classified by the media such as gas, liquid and solid. Their
principles, merits and disadvantages are shortly introduced. The electrochemical
deoxidation techniques are effective to remove oxygen upto the ppm level.