|
|
| General |
| Name, symbol,
number |
nickel, Ni, 28 |
| Chemical series |
transition metals |
| Group, period,
block |
10, 4, d |
| Appearance |
lustrous, metallic and
silvery with a gold tinge
 |
| Standard atomic weight |
58.6934(2) g·mol−1 |
| Electron configuration |
[Ar] 3d8 4s2 |
| Electrons per shell |
2, 8, 16, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
8.908 g·cm−3 |
| Liquid density at m.p. |
7.81 g·cm−3 |
| Melting point |
1728 K
(1455 °C, 2651 °F) |
| Boiling point |
3186 K
(2913 °C, 5275 °F) |
| Heat of fusion |
17.48 kJ·mol−1 |
| Heat of vaporization |
377.5 kJ·mol−1 |
| Heat capacity |
(25 °C) 26.07 J·mol−1·K−1 |
Vapor pressure
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
1783 |
1950 |
2154 |
2410 |
2741 |
3184 |
|
| Atomic properties |
| Crystal structure |
face centered cubic |
| Oxidation states |
2, 3
(mildly basic oxide) |
| Electronegativity |
1.91 (Pauling scale) |
Ionization energies
(more) |
1st: 737.1 kJ·mol−1 |
| 2nd: 1753.0 kJ·mol−1 |
| 3rd: 3395 kJ·mol−1 |
| Atomic radius |
135 pm |
| Atomic radius (calc.) |
149 pm |
| Covalent radius |
121 pm |
| Van der Waals radius |
163 pm |
| Miscellaneous |
| Magnetic ordering |
ferromagnetic |
| Electrical resistivity |
(20 °C) 69.3 nΩ·m |
| Thermal conductivity |
(300 K) 90.9 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 13.4 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(r.t.) 4900 m·s−1 |
| Young's modulus |
200 GPa |
| Shear modulus |
76 GPa |
| Bulk modulus |
180 GPa |
| Poisson ratio |
0.31 |
| Mohs hardness |
4.0 |
| Vickers hardness |
638 MPa |
| Brinell hardness |
700 MPa |
| CAS registry number |
7440-02-0 |
| Selected isotopes |
|
|
| References |
|
Nickel (IPA: /ˈnɪkəl/) is a metallic chemical element in the periodic table that has the symbol Ni and atomic number
28.
Characteristics
Nickel is a silvery white metal that takes on a high polish. It belongs to the transition
metals, and is hard and ductile. It occurs most usually in combination with sulfur and iron in pentlandite, with sulfur in millerite, with arsenic in the mineral nickeline, and with arsenic and sulfur in nickel glance.[1][2][3]
It is clear that in common with massive forms of chromium, aluminium and titanium metal that nickel is very slow to react with air, but
it is a very reactive element.
Because of its permanence in air and its inertness to oxidation, it is used in coins, for
plating iron, brass, etc., for chemical apparatus,
and in certain alloys, such as German silver. It is magnetic, and is very frequently
accompanied by cobalt, both being found in meteoric iron. It is
chiefly valuable for the alloys it forms, especially many superalloys, and particularly stainless steel.
Nickel is one of the five ferromagnetic elements. However, the U.S. "nickel" coin is not magnetic, because it actually is mostly (75%) copper. The Canadian nickel minted at various periods between
1922-81 was 99.9% nickel, and these are magnetic.
The most common oxidation state of nickel is +2, though 0, +1, +3 and +4 Ni complexes
are observed. It is also thought that a +6 oxidation state may exist, however, results are inconclusive.
The unit cell of nickel is a face centred cube with a lattice parameter of 0.356 nm giving a radius of the atom of 0.126
nm.[citation needed]Nickel-62 is the most stable nuclide of all the existing elements; it is more stable even than
Iron-56.
History
The use of nickel is ancient, and can be traced back as far as 3500 BC. Bronzes from what is
now Syria had a nickel content of up to 2%. Further, there are Chinese manuscripts suggesting that "white copper" (i.e. baitung) was used in the Orient between 1700 and 1400 BC. However, because the ores of
nickel were easily mistaken for ores of silver, any understanding of this metal and its use dates to more contemporary times.
Minerals containing nickel (e.g. kupfernickel, meaning copper of the devil ("Nick"), or false copper) were of value for
colouring glass green. In 1751, Baron Axel Fredrik Cronstedt was attempting to
extract copper from kupfernickel (now called niccolite), and obtained instead a white metal that he called nickel.
In the United States, the term "nickel" or "nick" was originally applied to the copper-nickel Indian cent coin introduced in
1859. Later, the name designated the three-cent coin introduced in 1865, and the following year the five-cent shield nickel appropriated the designation, which has remained ever since. Coins
of pure nickel were first used in 1881 in Switzerland. [1]
Biological role
Although not recognized until the 1970s, nickel plays numerous roles in biology. In fact urease (an enzyme which assists in the hydrolysis of urea) contains nickel. The
NiFe-hydrogenases contain nickel in addition to iron-sulfur clusters. Such [NiFe]-hydrogenases characteristically oxidise H2. A
nickel-tetrapyrrole coenzyme, F430, is present in the methyl coenzyme
M reductase which powers methanogenic archaea.
One of the carbon monoxide dehydrogenase enzymes consists of an Fe-Ni-S cluster.[4]
Other nickel-containing enzymes include a class of superoxide dismutase[5] and a glyoxalase.[6]
Occurrence
The bulk of the nickel mined comes from two types of ore deposits. The first are laterites where the principal ore minerals are nickeliferous limonite: (Fe,
Ni)O(OH) and garnierite (a hydrous nickel silicate): (Ni,
Mg)3Si2O5(OH). The second are magmatic sulfide deposits where the principal ore mineral is
pentlandite: (Ni, Fe)9S8.
In terms of supply, the Sudbury region of Ontario,
Canada, produces about 30 percent of the world's supply of nickel. The Sudbury Basin deposit is theorized to have been created by a massive meteorite impact event early in the geologic history of Earth. Russia contains about 40% of the world's
known resources at the massive Norilsk deposit in Siberia. The
Russian mining company MMC Norilsk Nickel mines this for the world market, as well as
the associated palladium. Other major deposits of nickel are found in New Caledonia, Australia, Cuba, and
Indonesia. The deposits in tropical areas are typically laterites which are produced by the
intense weathering of ultramafic igneous rocks and
the resulting secondary concentration of nickel bearing oxide and silicate minerals. A
recent development has been the exploitation of a deposit in western Turkey, especially
convenient for European smelters, steelmakers and factories. The one locality in the United States where nickel is commercially
mined is Riddle, Oregon, where several square miles of nickel-bearing garnierite surface
deposits are located.
Based on geophysical evidence, most of the nickel on Earth is postulated to be
concentrated in the Earth's core.
Applications
Nickel is used in many industrial and consumer products, including stainless steel, magnets, coinage, and special alloys. It
is also used for plating and as a green tint in glass. Nickel is pre-eminently an alloy metal, and its chief use is in the nickel
steels and nickel cast irons, of which there are innumberable varieties. It is also widely used for many other alloys, such as
nickel brasses and bronzes, and alloys with copper, chromium, aluminum, lead, cobalt, silver, and gold.
Nickel consumption can be summarized as: nickel steels (60%), nickel-copper alloys and nickel silver (14%), malleable nickel,
nickel clad and Inconel (9%), plating (6%), nickel cast irons (3%), heat and electric resistance alloys (3%), nickel brasses and
bronzes (2%), others (3%).
In the laboratory, nickel is frequently used as a catalyst for hydrogenation, most
often using Raney nickel, a finely divided form of the metal.
Extraction and purification
Nickel can be recovered using extractive metallurgy. Most sulfide ores have
traditionally been processed using pyrometallurgical techniques to produce a
matte for further refining. Recent advances in hydrometallurgy have resulted in recent nickel processing operations being developed using these
processes. Most sulphide deposits have traditionally been processed by concentration through a froth flotation process followed by pyrometallurgical
extraction. Recent advances in hydrometallurgical processing of sulphides has led to some recent projects being built around this
technology.
Nickel is extracted from its ores by conventional roasting and reduction processes which yield a metal of >75% purity.
Final purification in the Mond process to >99.99% purity This process was patented by L.
Mond and was used in South Wales in the 20th century. Nickel is reacted with carbon monoxide at around 50 degrees Celsius to form
volatile nickel carbonyl. Any impurities remain solid. The nickel carbonyl gas is passed into a large chamber at high
temperatures which tens of thousands of nickel spheres are maintained in constant motion. The nickel carbonyl decomposes depositing pure nickel onto the nickel spheres (known as pellets).
Alternatively, the nickel carbonyl may be decomposed in a smaller chamber at 230 degrees Celsius to create fine powders. The
resultant carbon monoxide is re-circulated through the process. The highly pure nickel produced by this process is known as
carbonyl nickel. A second common form of refining involves the leaching of the metal matte followed by the electro-winning
of the nickel from solution by plating it onto a cathode. In many stainless steel applications, the nickel can be taken directly
in the 75% purity form, depending on the presence of any impurities.
In 2005, Russia was the largest producer of nickel with about one-fifth world share closely
followed by Canada, Australia and Indonesia, reports the British Geological Survey.
Compounds
- Kamacite is a naturally occurring alloy of iron and nickel, usually in the proportion of 90:10 to 95:5 although impurities such as
cobalt or carbon may be present. Kamacite occurs in nickel-iron
meteorites.
See also nickel compounds.
Isotopes
-
Naturally occurring nickel is composed of 5 stable isotopes; 58Ni,
60Ni, 61Ni, 62Ni and 64Ni with 58Ni being the most abundant (68.077%
natural abundance). 18 radioisotopes have been
characterised with the most stable being 59Ni with a half-life of 76,000 years,
63Ni with a half-life of 100.1 years, and 56Ni with a half-life of 6.077 days. All of the remaining
radioactive isotopes have half-lives that are less than 60 hours and the majority of these
have half-lives that are less than 30 seconds. This element also has 1 meta state.
Nickel-56 is produced in large quantities in type Ia supernovae and the shape of the
light curve of these supernovae corresponds to the decay of nickel-56 to cobalt-56 and then to iron-56.
Nickel-59 is a long-lived cosmogenic radionuclide with a half-life of 76,000 years. 59Ni has found many applications in
isotope geology. 59Ni has been used to date the terrestrial age of
meteorites and to determine abundances of extraterrestrial dust in ice and sediment. Nickel-60 is the daughter product of the extinct radionuclide 60Fe (half-life = 1.5 Myr).
Because the extinct radionuclide 60Fe had such a long half-life, its persistence in materials in the solar system at high enough concentrations may have generated observable variations in the isotopic
composition of 60Ni. Therefore, the abundance of 60Ni present in extraterrestrial material may provide
insight into the origin of the solar system and its early history.
Nickel-62 has the highest binding energy per nucleon of any isotope for any element.
Isotopes heavier than 62Ni cannot be formed by nuclear fusion without losing
energy.
Nickel-48, discovered in 1999, is the most proton-rich nickel isotope known . With 28 protons
and 20 neutrons 48Ni is "doubly
magic" (like 208Pb) and therefore unusually stable [7].
The isotopes of nickel range in atomic weight from 48 u (48-Ni) to 78 u (78-Ni). Nickel-78's half-life was recently measured to be 110 milliseconds and is
believed to be an important isotope involved in supernova nucleosynthesis of
elements heavier than iron. [2]
Precautions
Exposure to nickel metal and soluble compounds should not exceed 0.05 mg/cm³ in nickel equivalents per 40-hour work week.
Nickel sulfide fume and dust is believed to be carcinogenic, and various other nickel
compounds may be as well.[8][9]
Nickel carbonyl, [Ni(CO)4], is an extremely toxic gas. The toxicity of
metal carbonyls is a function of both the toxicity of a metal as well as the carbonyl's ability to give off highly toxic
carbon monoxide gas, and this one is no exception. It is explosive in air. [citation needed]Sensitised individuals may show an allergy to nickel affecting their
skin. The amount of nickel which is allowed in products which come into contact with human skin is regulated by the
European Union. In 2002 researchers found amounts of nickel being emitted by 1 and 2
Euro coins far in excess of those standards. This is believed to be due to a galvanic reaction.[10]
Metal Value
As of April 5, 2007 nickel was trading at 52,300
$US/mt (52.30 $US/kg, 23.51 $US/lb or 1.47 $US/oz), [3] [4]. Interestingly, the US nickel coin contains 0.04 oz
(1.25g) of nickel, which at this new price is worth 6.5 cents, along with 3.75 grams of copper worth about 3 cents, making the
metal value over 9 cents. Since a nickel is worth 5 cents, this made it an attractive target for melting by people wanting to
sell the metals at a profit. However, the United States Mint, in anticipation of this
practice, implemented new interim rules on December 14, 2006,
subject to public comment for 30 days, which criminalize the melting and export of cents and nickels.[5]
Violators can be punished with a fine of up to US$10,000 and/or imprisoned for a maximum of five years.
References
- ^ Los Alamos National Laboratory – Nickel
- ^ National Pollutant Inventory - Nickel and compounds Fact Sheet
- ^ High nickel release from 1- and 2-euro coins (Nature Abstract)
- ^ Jaouen, G., Ed. Bioorganometallics: Biomolecules, Labeling, Medicine;
Wiley-VCH: Weinheim, 2006
- ^ Szilagyi, R. K. Bryngelson, P. A.; Maroney, M. J.; Hedman, B.; Hodgson, K.
O.; Solomon, E. I."S K-Edge X-ray Absorption Spectroscopic Investigation of the Ni-Containing Superoxide Dismutase Active Site:
New Structural Insight into the Mechanism" Journal of the American Chemical Society 2004, volume 126, 3018-3019.
- ^ Thornalley, P. J., "Glyoxalase I--structure, function and a critical role
in the enzymatic defence against glycation", Biochemical Society Transactions, 2003, 31, 1343-8.
- ^ W., P. (October 23, 1999). Twice-magic metal
makes its debut - isotope of nickel. Science News. Retrieved on 2006-09-29.
- ^ KS Kasprzak, FW Sunderman Jr, K Salnikow. Nickel carcinogenesis.
Mutation Research. 2003 Dec 10;533(1-2):67-97. PubMed
- ^ JK Dunnick, MR Elwell, AE Radovsky, JM Benson, FF Hahn, KJ Nikula, EB Barr,
CH Hobbs. Comparative Carcinogenic Effects of Nickel Subsulfide, Nickel Oxide, or Nickel Sulfate Hexahydrate Chronic Exposures
in the Lung. Cancer Research. 1995 Nov 15;55(22):5251-6. PubMed
- ^ O Nestle, H Speidel, MO Speidel. High nickel release from 1- and 2-euro
coins. Nature. 419, 132 (12 September 2002). free abstract
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