Terbium

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Terbium

This is terbium.

Symbol Tb
Atomic number 65
Atomic mass 158.9254 amu

Terbium, discovered in 1843, is a soft, ductile, malleable and silvery element of the lanthanide series.

Distinguishing properties

Terbium is extremely reactive when exposed to air or oxygen and must be kept in an inert atmosphere.

Occurrence

Terbium is a rare-earth metal occurring in low concentration in monazite sand, which is a mixture of phosphate of calcium, thorium, cerium, and most of the other rare-earths. This sand is often 50% rare-earth by mass and about 0.03% terbium. Other sources of terbium are oxide mixtures found in xenotime and euxenite. Such oxide mixtures often contain up to 1% terbium.

Usage

Terbium is used in special lasers and as a dopant in solid-state devices.

See also

Periodic table of the elements