A soft, silvery-white, rare metallic element
in group VB of the periodic table.
Niobium is a transition element.
It occurs as columbite (niobium was also
formerly known as columbium) and pyrochlore. It was first discovered in
| A niobium cavity resonator, part
of a superconducting linear accelerator
Niobium is unreactive and corrosion-resistant,
and is used in steels, high-temperature alloys,
and superconducting alloys (see superconductivity.
Being permable to neutrons, it is also used
in nuclear reactors. At high temperatures
it reacts with nonmetals to give pentavalent
covalent compounds. Its most common isotope is 93Nb (100%).
|relative atomic mass