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Separation of tantalum-columbium by solvent extraction
Separation of chloride vapors during ilmenite chlorination
Effects of interstitial impurity levels on mechanical properties of columbium at low temperatures
Separating tantalum and columbium by solvent extraction :HF- HCl-Diethyl ketone system
Columbium and tantalum:a materials survey
Preparation of columbium and tantalum by metallic reduction of their chlorides
X-ray spectrographic analysis for trace quantities of tantalum in columbium
Thermodynamic data for columbium (niobium) carbide
Analysis of high-purity columbium by optical emission spectrography
Extraction of tantalum and columbium from ores and concentrates by chlorination
Microflotation studies of some columbium-tantalum minerals
Separation of columbium, tantalum, titanium, and zirconium from titanium chlorination residues
Nitride intermediates in the preparation of columbium, vanadium, and tantalum metals(in two parts) :
Nitride intermediates in the preparation of columbium, vanadium, and tantalum metals(in two parts) :