neodymium


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neodymium

(nē'ōdĭm`ēəm), metallic chemical element; symbol Nd; at. no. 60; at. wt. 144.242; m.p. about 1,021°C;; b.p. about 3,068°C;; sp. gr. 7.004 at 20°C;; valence +3. Neodymium is a lustrous silver-yellow metal. 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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 in 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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 of 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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. It exists in two distinct forms (see 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 it has a hexagonal crystalline structure, but when heated above about 800°C; it assumes a face-centered cubic conformation with specific gravity about 6.8. The metal tarnishes in air; the coating formed does not protect the metal from further oxidation, so it must be stored away from contact with air. The oxide (neodymia, Nd2O3) is light blue. The metal is also attacked by water and by acids. Its salts form various red aqueous solutions. Neodymium is present in the minerals monazitemonazite
, yellow to reddish-brown natural phosphate of the rare earths, mainly the cerium and lanthanum metals, usually with some thorium. Yttrium, calcium, iron, and silica are frequently present.
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 and bastnasite. The metal may be prepared from its halides by reduction. Neodymium is one of several metals in an alloy commonly used in cigarette lighter flints. It also is used in powerful permanent magnets and in coloring glasses. The earth didymia is a mixture of the oxides of neodymium and praseodymium. The lenses of goggles used by glassblowers are made with a didymium glass that absorbs the yellow sodium glare of the flame. Neodymium was discovered in 1885 by C. A. von Welsbach who separated Mosander's "didymium" into two components, the earths neodymia and praseodymia.

neodymium

[‚nē·ō′dim·ē·əm]
(chemistry)
A metallic element, symbol Nd, with atomic weight 144.24, atomic number 60; a member of the rare-earth group of elements.

neodymium

a toxic silvery-white metallic element of the lanthanide series, occurring principally in monazite: used in colouring glass. Symbol: Nd; atomic no.: 60; atomic wt.: 144.24; valency: 3; relative density: 6.80 and 7.00 (depending on allotrope); melting pt.: 1024?C; boiling pt.: 3127?C
References in periodicals archive ?
Development policies and plans of Neodymium Magnet market are discussed as well as manufacturing processes and cost structures are analyzed.
Michael Bau from the Jacobs University Bremen), came to the surprising result - 2,700 million years ago, seawater contained an unusually high abundance of the radioactive isotope Hafnium 176 but a comparably low abundance of the radioactive isotope Neodymium 143, similar to what can be observed in present day seawater.
The real value drivers for Ngualla are the neodymium - praseodymium and mid + heavy high purity rare earth oxide products (Figure 1), which together contribute 85% of projected annual revenue.
A double walled version is available for use with heated products and the standard neodymium magnets are suitable for use up to 100[degrees]C.
Neodymium glass was used for a range of items, including vases, perfume bottles, paperweights and even jewellery.
It's hard to imagine making a more perfect magnetic material than neodymium-boron-iron," says George Hadjipanayis, a materials scientist at the University of Delaware in Newark, whose research was crucial to the invention of the first neodymium magnets.
This work investigates the effect of the ratio between the DEAC and neodymium molar concentrations, polymerization temperatures, catalyst concentrations, and butadiene concentrations on the final MWD of obtained polymers and on the catalyst performance in butadiene polymerizations performed with a neodymium versatate catalyst.
Neodymium has extraordinary magnetic properties far exceeding those of iron.
The race to produce better hybrid and electric cars has spurred demand for rare earth elements such as neodymium and lithium used in batteries.
The debate over peak oil is heavily politicized, so let's set it aside and test the idea of imminent resource peaks and their consequences for economic growth on three other nonrenewable resources: lithium, neodymium, and phosphorus.
Rapid separation of micrometer- and nanometer-scale magnetic beads is possible in full microplate format for fast wash cycles, and a high-energy neodymium iron boron magnet provides superior retention for rapid and uniform separation in each microplate well.
95) delivers a really rich bass, while neodymium magnets make all the difference in crystal-clear sound.