|
|
| Atomic symbol: 60 |
| Atomic number: Nd |
| Atomic weight: 144.24 |
| Atomic volume: 20.6 cm3/mol |
| Density: 7.0 g/cm3 |
| Period Number: 6 |
| Group number: none |
| Group name: Rare Earth, Lanthanides |
| Element classification: Metal |
| Phase at room temperature: Solid |
| Melting Point: 1283.2 K |
| Boiling point: 3300 K |
| Heat of fusion: 7.140 kJ/mol |
| Heat of vaporization: 273.0 kJ/mol |
| Ionization Energy: 5.525 eV |
| 1st ionization energy: 529.6 kJ/mole |
| 2nd ionization energy: 1035 kJ/mole |
| 3rd ionization energy: 2130 kJ/mole |
| Electronegativity: 1.14 |
| Electron affinity: 50 kJ/mole |
| Specific heat: 0.19 J/gK |
| Heat atomization: 328 kJ/mole atoms |
| Shells: 2,8,18,22,8,2 |
| Electron Shell Configuration: [Xe] 4f4 6s2 |
| Minimum oxidation number: 0 |
| Maximum oxidation number: 3 |
| Minimum common oxidation number: 0 |
| Maximum common oxidation no: 3 |
Appearance & Characteristics |
| Structure:: cp: close packed (ABCB) |
| Color: silvery-white |
| Hardness: mohs |
| Toxicity: ? |
| Characteristics: ? |
| Uses: alloys, Welder's mask |
| Reaction with air: vigorous, w/ht =>Nd2O3 |
| Reaction with 6M HCl: mild, =>H2, NdCl3 |
| Reaction with 15M HNO3: mild, =>Nd(NO3)3 |
| Reaction with 6M NaOH: ? |
| Number of isotopes: 7 |
| Oxide(s): Nd2O3 |
| Hydride(s): NdH2 NdH3 |
| Chloride(s): NdCl2 NdCl3 |
| Atomic Radius: 181 pm |
| Ionic radius (1- ion): pm |
| Ionic radius (1+ ion): pm |
| Ionic radius (2- ion): pm |
| Ionic radius (2+ ion): pm |
| Ionic radius (3+ ion): 112.3 pm |
| Thermal conductivity: 16.5 J/m-sec-deg |
| Electrical conductivity: 15.4 1/mohm-cm |
| Polarizability: 31.4 A^3 |
| Source: Monazite(phosphate),bastnaesite |
| Relative abundance solar system: -0.082 log |
| Abundance earth's crust: 1.4 log |
| Estimated crustal abundance: 4.15×101 milligrams per kilogram |
| Estimated oceanic abundance: 2.8×10-6 milligrams per liter |
|
|
|
| (Gr. neos: new, and didymos: twin) In 1841, Mosander, extracted a rose-colored oxide from cerite , which he believed contained a new element. He named the element didymium, as it was an inseparable twin brother of lanthanum. In 1885 von Welsbach separated didymium into two new elemental components, neodymia and praseodymia, by repeated fractionation of ammonium didymium nitrate. While the free metal is in misch metal, long known and used as a pyrophoric alloy for light flints, the element was not isolated in relatively pure form until 1925. Neodymium is present in misch metal to the extent of about 18%. It is present in the minerals monazite and bastnasite, which are principal sources of rare-earth metals. |
| The metal has a bright silvery metallic luster, Neodymium is one of the more reactive rare-earth metals and quickly tarnishes in air, forming an oxide that spalls off and exposes metal to oxidation. The metal, therefore, should be kept under light mineral oil or sealed in a plastic material. Neodymium exists in two allotropic forms, with a transformation from a double hexagonal to a body-centered cubic structure taking place at 8630C. |
| Didymium, of which neodymium is a component, is used for coloring glass to make welders goggles. By itself, neodymium colors glass delicate shades ranging from pure violet through wine-red and warm gray. Light transmitted through such glass shows unusually sharp absorption bands. The glass has been used in astronomical work to produce sharp bands by which spectral lines may be calibrated. Glass containing neodymium can be used as a laser material to produce coherent light. Neodymium salts are also used as a colorant for enamels. |
| Natural neodymium is a mixture of seven stable isotopes. Fourteen other radioactive isotopes are recognized. |
 |
Would you like to contact senior executives directly? Join our network on OurMetals.com
It's free and only takes 2 minutes to register. |
|
|
|
 Company
|
| SEKOM Handelsges.m.b.H.... |
|
Our company is a private firm founded in 1990 with aim to develop export and import with Russia. We do promote EU industrial and consumer goods in Russia and strongly support marketing of Russian and CIS industrial products and services.
|
|
0 selling
&
0 buying
leads |
|
Friendly links
|
|
