ytterbium


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ytterbium

(ĭtûr`bēəm) [for Ytterby, a town in Sweden], metallic chemical element; symbol Yb; at. no. 70; at. wt. 173.054; m.p. 819°C;; b.p. about 1,194°C;; sp. gr. about 7.0; valence +2 or +3. Ytterbium is a soft, malleable, ductile, lustrous silver-white metal. Although it is one of the rare-earth metalsrare-earth metals,
in chemistry, group of metals including those of the lanthanide series and actinide series and usually yttrium, sometimes scandium and thorium, and rarely zirconium. Promethium, which is not found in nature, is not usually considered a rare-earth metal.
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 of the lanthanide serieslanthanide series,
a series of metallic elements, included in the rare-earth metals, in Group 3 of the periodic table. Members of the series are often called lanthanides, although lanthanum (atomic number 57) is not always considered a member of the series.
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 in Group 3 of the periodic tableperiodic table,
chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled
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, in some of its chemical and physical properties it more closely resembles calcium, strontium, and barium. It exhibits allotropyallotropy
[Gr.,=other form]. A chemical element is said to exhibit allotropy when it occurs in two or more forms in the same physical state; the forms are called allotropes.
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; at room temperature a face-centered cubic crystalline form is stable. The metal tarnishes slowly in air and reacts slowly with water but rapidly dissolves in mineral acids. It forms numerous compounds, some of which are yellow or green. The oxide (ytterbia, Yb2O3) is colorless. It is widely distributed in a number of minerals, e.g., gadolinite, and is recovered from monazite but has no commercial uses. Its discovery is credited to J. C. G. de Marignac, who in 1878 separated a substance he called ytterbia. In 1907, Georges Urbain showed that this substance contained lutetium in addition to ytterbium. At about this same time C. A. von Welsbach independently discovered ytterbium and called it aldebaranium.

ytterbium

[i′tər·bē·əm]
(chemistry)
A rare-earth metal of the yttrium subgroup, symbol Yb, atomic number 70, atomic weight 173.04; lustrous, malleable, soluble in dilute acids and liquid ammonia, reacts slowly with water; melts at 824°C, boils at 1427°C; used in chemical research, lasers, garnet doping, and x-ray tubes.

ytterbium

a soft malleable silvery element of the lanthanide series of metals that occurs in monazite and is used to improve the mechanical properties of steel. Symbol: Yb; atomic no.: 70; atomic wt.: 173.04; valency: 2 or 3; relative density: 6.903 (alpha), 6.966 (beta); melting pt.: 819?C; boiling pt.: 1196?C
References in periodicals archive ?
It shows the well-known approach of co-doping the erbium-containing optical materials with ytterbium ions.
The phosphor particles used in this study emit green light (550 nm) and are composed of ytterbium and erbium as respective absorber and emitter ions embedded in a preceramic matrix.
The October 3, 2012 economic model (1) cut Dy, Y, Eu, Tb and Nd "Critical REE" price estimates 25% to cut $1,021 million, (2) raised prior "nil" price estimates to $25 per pound for Ytterbium Yb and Erbium Er and to $10 per pound for Thulium Tm, Lutetium Lu and Holmium Ho to add $475 million in NPV, (3) introduced a $60 per pound Uranium price estimate, 60% recovery rate and 44.
Researchers found that adding just 1% of a rare earth element like cerium or ytterbium was enough to alter its mechanisms to increase conversion efficiency by 25% compared to conventional thermoelectrics.
The physicists from Imperial's Centre for Cold Matter studied the electrons inside molecules called Ytterbium Fluoride.
The physicists from the college's Centre for Cold Matter studied the electrons inside molecules of ytterbium fluoride.
hydrogen + xenon + barium + tantalum + boron + praseodymium + iridium + hassium + plutonium + thallium + germanium + scandium + thulium + einsteinium + erbium + cadmium + beryllium + tin + actinium + seaborgium + carbon + fluorine + indium + osmium + nitrogen + potassium + lead + protactinium + silicon + lutetium + rhenium + mercury + argon + neodymium + platinum + thorium lanthanum + oxygen + terbium + radon + samarium + dysprosium + iodine + bohrium + aluminium + chromium + palladium + tungsten + lithium + caesium + dubnium + meitnerium + niobium + ytterbium + gallium + arsenic + iron + sodium + nobelium + francium + astatine + strontium + copper + gadolinium + yttrium + selenium + curium + chlorine + promethium + gold + uranium + antimony
long persistent phosphors' and solar panels) that are under development, some of which will require the more obscure heavy rare earths such as ytterbium, erbium, holmium and thulium.
Objective: This project proposes to explore multi-orbital physics with ensembles of ultracold fermionic Ytterbium atoms.
Las Vegas gamblers would do well to put their chips on ytterbium fluoride as the molecule most likely to yield a new limit on the electron electric dipole moment.
Washington, August 12 (ANI): Scientists at the National Institute of Standards and Technology (NIST) have said that an experimental atomic clock based on ytterbium atoms is about four times more accurate than it was several years ago, giving it a precision comparable to that of the NIST-F1 cesium fountain clock, the civilian time standard of the US.