Atomic Number: 70
Atomic Symbol: Yb
Atomic Weight: 173.054
Melting Point: 1,506 F (819 C)
Boiling Point: 2,185 F (1,196 C)
Discovery: In 1878, Jean Charles Galissard de Marignac, a Swedish chemist, discovered a new component, which he called ytterbia, in the earth then known as erbia. A French chemist, Georges Urbain, separated ytterbia into two components in 1907. He called them neoytterbia and lutecia. The elements are now known as ytterbium and lutetium. [See Periodic Table of the Elements]
Properties of ytterbium
Ytterbium has a bright silvery luster, is soft, malleable, and quite ductile. One of the lanthanides, it is fairly stable in air but is readily attacked and dissolved by dilute and concentrated mineral acids and reacts slowly with water.
Sources of ytterbium
Ytterbium occurs along with other rare earths in a number of rare minerals. It is commercially recovered principally from monazite sand, which contains about 0.03 percent. Ion-exchange and solvent extraction techniques have simplified the separation of the rare earths from one another. Ytterby is the site of a quarry that yielded many unusual minerals containing rare earths and other elements.
Uses of ytterbium
Ytterbium has few uses. It can be alloyed with stainless steel to improve some of its mechanical properties and used as a doping agent in fiber optic cable. One of ytterbium's isotopes is being considered as a radiation source for portable X-ray machines.
(Source: Los Alamos National Laboratory)