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Niobium has physical and chemical properties similar to those of the element tantalum, and the two are difficult to distinguish.
NR008 (OTTO) Niobium rod, dia 3 mm, 99.9% Cas 7440-03-1 -used in various superconducting materials. These superconducting alloys, also containing titanium and tin, are widely used in the superconducting magnets of MRI scanners.