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Related to erbium: Erbium doped fiber amplifier
erbium (ûrˈbēəm) [from Ytterby, a town in Sweden], metallic chemical element; symbol Er; at. no. 68; at. wt. 167.259; m.p. 1,529℃; b.p. 2,863℃; sp. gr. 9.05 at 25℃; valence +3. Erbium is a soft, malleable, lustrous, silvery metal. It is a member of the lanthanide series in Group 3 of the periodic table. With other rare earths its oxide occurs in the mineral gadolinite, found in Sweden. Natural erbium is a mixture of 6 stable isotopes; in addition, 10 radioactive isotopes are known. Erbium does not oxidize in air as rapidly as some of the other rare-earth metals. Erbia is a rose-colored oxide of erbium; it has been used to a very limited extent in glazes and glass as a coloring agent. The discovery of erbium is generally credited to Carl G. Mosander, although he did not succeed in isolating the element. In 1843 he separated from gadolinite three oxide fractions that he called yttria, erbia, and terbia. Later, what he had called terbia became known as erbia and was shown to contain five distinct rare earths, now called erbia, scandia, holmia, thulia, and ytterbia. Fairly pure erbium oxide was first isolated in 1905; fairly pure erbium was isolated in 1934.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Er, a chemical element. Atomic number, 68; atomic weight, 167.26. Erbium is one of the lanthanides.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
A trivalent metallic rare-earth element, symbol Er, of the yttrium subgroup, found in euxenite, gadolinite, fergusonite, and xenotine; atomic number 68, atomic weight 167.26, specific gravity 9.051; insoluble in water, soluble in acids; melts at 1400-1500°C.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
a soft malleable silvery-white element of the lanthanide series of metals: used in special alloys, room-temperature lasers, and as a pigment. Symbol: Er; atomic no.: 68; atomic wt.: 167.26; valency: 3; relative density: 9.006; melting pt.: 1529?C; boiling pt.: 2868?C
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
erbiumA rare earth material used in optical amplifiers. See EDFA.
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