Aluminium

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Review

Aluminium

Content

 

1. Introduction

2. Characteristics

3. Isotopes

4. Natural occurrence

5. Production and refinement

6. Recycling

7. Chemistry

7.1 Oxidation state +1

7.2 Oxidation state +2

7.3 Oxidation state +3

7.4 Analysis

8. Applications

8.1 General use

8.2 Aluminium compounds

8.3 Aluminium alloys in structural applications

8.4 Household wiring

9. History

10. Etymology

10.1 Nomenclature history

10.2 Present-day spelling

11. Health concerns

12. Effect on plants

13. Conclusion

14. References

1. Introduction

 

Aluminium is a silvery white and ductile member of the boron group of chemical elements. It has the symbol Al; its atomic number is 13. It is not soluble in water under normal circumstances. Aluminium is the most abundant metal in the Earths crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earths solid surface. Aluminium is too reactive chemically to occur in nature as a free metal. Instead, it is found combined in over 270 different minerals.[4] The chief source of aluminium is bauxite ore.

Aluminium is remarkable for its ability to resist corrosion due to the phenomenon of passivation and for the metals low density. Structural components made from aluminium and its alloys are vital to the aerospace industry and very important in other areas of transportation and building. Its reactive nature makes it useful as a catalyst or additive in chemical mixtures, including being used in ammonium nitrate explosives to enhance blast power.

General properties

Name, symbol, number aluminium, Al, 13

Element category other metal

Group, period, block 13, 3, p

Standard atomic weight 26.9815386(13) gmol−1

Electron configuration [Ne] 3s2 3p1

Electrons per shell 2, 8, 3 (Image)

Physical properties

Phase solid

Density (near r.t.) 2.70 gcm−3

Liquid density at m.p. 2.375 gcm−3

Melting point 933.47 K,660.32 C,1220.58 F

Boiling point 2792 K,2519 C,4566 F

Heat of fusion 10.71 kJmol−1

Heat of vaporization 294.0 kJmol−1

Specific heat capacity (25 C) 24.200 Jmol−1K−1

Vapor pressure

P/Pa 1 10 100 1 k 10 k 100 k

at T/K 1482 1632 1817 2054 2364 2790

Atomic properties

Oxidation states 3, 2[1], 1[2]

(amphoteric oxide)

Electronegativity 1.61 (Pauling scale)

Ionization energies

(more) 1st: 577.5 kJmol−1

2nd: 1816.7 kJmol−1

3rd: 2744.8 kJmol−1

Atomic radius 143 pm

Covalent radius 1214 pm

Van der Waals radius 184 pm

Miscellanea

Crystal structure face-centered cubic

Magnetic ordering paramagnetic[3]

Electrical resistivity (20 C) 28.2 nΩm

Thermal conductivity (300 K) 237 Wm−1K−1

Thermal expansion (25 C) 23.1 mm−1K−1

Speed of sound (thin rod) (r.t.) (rolled) 5,000 ms−1

Youngs modulus 70 GPa

Shear modulus 26 GPa

Bulk modulus 76 GPa

Poisson ratio 0.35

Mohs hardness 2.75

Vickers hardness 167 MPa

Brinell hardness 245 MPa

CAS registry number 7429-90-5

2. Characteristics

 

Aluminium is a soft, durable, lightweight, malleable metal with appearance ranging from silvery to dull grey, depending on the surface roughness. Aluminium is nonmagnetic and nonsparking. It is also insoluble in alcohol, though it can be soluble in water in certain forms. The yield strength of pure aluminium is 7-11 MPa, while aluminium alloys have yield strengths ranging from 200 MPa to 600 MPa.[5] Aluminium has about one-third the density and stiffness of steel. It is ductile, and easily machined, cast, drawn and extruded.

Corrosion resistance can be excellent due to a thin surface layer of aluminium oxide that forms when the metal is exposed to air, effectively preventing further oxidation. The strongest aluminium alloys are less corrosion resistant due to galvanic reactions with alloyed copper.[5] This corrosion resistance is also often greatly reduced when many aqueous salts are present however, particularly in the presence of dissimilar metals.

Aluminium atoms are arranged in a face-centred cubic (fcc) structure. Aluminium has a stacking-fault energy of approximately 200 mJ/m.[6]

Aluminium is one of the few metals that retain full silvery reflectance in finely powdered form, making it an important component of silver paints. Aluminium mirror finish has the highest reflectance of any metal in the 200-400 nm (UV) and the 3000-10000 nm (far IR) regions, while in the 400-700 nm visible range it is slightly outdone by tin and silver and in the 700-3000 (near IR) by silver, gold, and copper.[7]

Aluminium is a good thermal and electrical conductor, by weight better than copper. Aluminium is capable of being a superconductor, with a superconducting critical temperature of 1.2 kelvin and a critical magnetic field of about 100 gauss.[8]

3. Isotopes

 

Aluminium has nine isotopes, whose mass numbers range from 23 to 30. Only 27Al (stable isotope) and 26Al (radioactive isotope, t1/2 = 7.2 105 y) occur naturally; however, 27Al has a natural abundance of 99.9+ %. 26Al is produced from argon in the atmosphere by spallation caused by cosmic-ray protons. Aluminium isotopes have found practical application in dating marine sediments, manganese nodules, glacial ice, quartz in rock exposures, and meteorites. The ratio of 26Al to 10Be has been used to study the role of transport, deposition, sediment storage, burial times, and erosion on 105 to 106 year time scales.[9] Cosmogenic 26Al was first applied in studies of the Moon and meteorites. Meteoroid fragments, after departure from their parent bodies, are exposed to intense cosmic-ray bombardment during their travel through space, causing substantial 26Al production. After falling to Earth, atmospheric shielding protects the meteorite fragments from further 26Al production, and its decay can then be used to determine the meteorites terrestrial age. Meteorite research has also shown that 26Al was relatively abundant at the time of formation of our planetary system. Most meteorite scientists believe that the energy released by the decay of 26Al was responsible for the melting and differentiation of some asteroids after their formation 4.55 billion years ago.[10]

4. Natural occurrence

 

In the Earths crust, aluminium is the most abundant (8.3% by weight) metallic element and the third most abundant of all elements (after oxygen and silicon).[11] Because of its strong affinity to oxygen, however, it is almost never found in the elemental state; instead it is found in oxides or silicates. Feldspars, the most common group of minerals in the Earths crust, are aluminosilicates. Native aluminium metal can be found as a minor phase in low oxygen fugacity environments, such as the interiors of certain volcanoes.[12] It also occurs in the minerals beryl, cryolite, garnet, spinel and turquoise.[11] Impurities in Al2O3, such as chromium or cobalt yield the gemstones ruby and sapphire, respectively. Pure Al2O3, known as Corundum, is one of the hardest materials known.[11]

Although aluminium is an extremely common and widespread element, the common aluminium minerals are not economic sources of the metal. Almost all metallic aluminium is produced from the ore bauxite (AlOx(OH)3-2x). Bauxite occurs as a weathering product of low iron and silica bedrock in tropical climatic conditions.[13] Large deposits of bauxite occur in Australia, Brazil, Guinea and Jamaica but the primary mining areas for the ore are in Ghana, Indonesia, Jamaica, Russia and Surinam.[14] Smelting of the ore mainly occurs in Australia, Brazil, Canada, Norway, Russia and the United States. Because smelting is an energy-intensive process, regions with excess natural gas supplies (such as the United Arab Emirates) are becoming aluminium refiners.

5. Production and refinement

 

Although aluminium is the most abundant metallic element in the Earths crust, it is rare in its free form, occurring in oxygen-deficient environments such as volcanic mud, and it was once considered a precious metal more valuable than gold. Napoleon III, emperor of France, is reputed to have given a banquet where the most honoured guests were given aluminium utensils, while the other guests had to make do with gold.[15][16] The Washington Monument was completed, with the 100 ounce (2.8 kg) aluminium capstone being put in place on December 6, 1884, in an elaborate dedication ceremony. It was the largest single piece of aluminium cast at the time. At that time, aluminium was as expensive as silver.[17] Aluminium has been produced in commercial quantities for just over 100 years.

Aluminium is a strongly reactive metal that forms a high-energy chemical bond with oxygen. Compared to most other metals, it is difficult to extract from ore, such as bauxite, due to the energy required to reduce aluminium oxide (Al2O3). For example, direct reduction with carbon, as is used to produce iron

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