Zirconium: the essentials

Zirconium is a greyish-white lustrous metal. The finely divided metal can ignite spontaneously in air, especially at elevated temperatures. The solid metal is much more difficult to ignite. The inherent toxicity of zirconium compounds is low. Hafnium is invariably found in zirconium ores, and the separation is difficult. Commercial grade zirconium contains from 1 to 3% hafnium. The hafnium is removed from the zirconium used in the nuclear power industry.

Zirconium is found in S-type stars, and has been identified in the sun and meteorites. Analyses of lunar rock samples show a surprisingly high zirconium oxide content as compared with terrestrial rocks. Some forms of zircon (ZrSiO4) have excellent gemstone qualities.

Zirconium: historical information

Zirconium was discovered by Martin Heinrich Klaproth in 1789 at Berlin, Germany. Origin of name: from the Arabic word "zargun" meaning "gold colour".

The name zircon probably originated from the arabic "zargun", which describes the colour of the gemstone now known as zircon (ZrSiO4). The minerals jargon, hyacinth, and jacinth also contain zircon and these have been known since biblical times and are mentioned in the bible in several places. The existence of a new element within these minerals was not suspected until studies by Martin Heinrich Klaproth in the late 18th century.

The impure metal was first isolated by Jöns Jacob Berzelius in 1824 who heated a mixture of potassium and potassium zirconium fluoride together in an iron tube. Pure zirconium was first prepared in 1914.

Zirconium around us Read more »

Zirconium has no biological role. The tolerance of human tissues to it makes the metal suitable for some artificial joints and limbs.

Zirconium is never found as the free metal. The main ore is Zircon (ZrSiO4) and this is found in deposits in Australia, Brazil, India, Malysis, Russia, and the USA. All these minerals contain a little hafnium as well and the separation of the two is difficult.

Zirconium has been found in the spectra of S-type stars and has been identified in the sun and meteorites. Lunar rock samples show a surprisingly high zirconium oxide content as compared to rocks from earth.

Abundances for cobalt in a number of different environments. More abundance data » »
Location ppb by weight ppb by atoms Links
Universe 50 0.7 Abundance in the universe of the chemical elements displayed on a miniature periodic table
Crustal rocks 130000 30000 Abundance in the earth's crust of the chemical elements displayed on a miniature periodic table
Human 50 ppb by weight 3 atoms relative to C = 1000000 Abundance in humans of the chemical elements displayed on a miniature periodic table

Physical properties Read more »

Crystal structure Read more »

The solid state structure of zirconium is: hcp (hexagonal close-packed).

Zirconium: orbital properties Read more »

Zirconium atoms have 40 electrons and the shell structure is 2.8.18.10.2. The ground state electronic configuration of neutral Zirconium is [Kr].4d2.5s2 and the term symbol of Zirconium is 3F2.

Isolation

Isolation: zirconium is available from commercial sources so preparation in the laboratory is not normally required. In industry, reduction of ores with carbon is not a useful option as intractable carbides are produced. As for titanium, the Kroll method is used for zirconium and involves the action of chlorine and carbon upon baddeleyite (ZrO2). The resultant zirconium tetrachloride, ZrCl4, is separated from the iron trichloride, FeCl3, by fractional distillation. Finally ZrCl4 is reduced to metallic zirconium by reduction with magnesium, Mg. Air is excluded so as to prevent contamination of the product with oxygen or nitrogen.

ZrO2 + 2Cl2 + 2C (900°C) → ZrCl4 + 2CO

ZrCl4 + 2Mg (1100°C) → 2MgCl2 + Zr

Excess magensium and magnesium dichloride is removed from the product by treatment with water and hydrochloric acid to leave a zirconium "sponge". This can be melted under helium by electrical heating.

Zirconium isotopes Read more »

Zirconium has five stable isotopes, of which a few are used for the production of radioisotopes. Although radioactive Zr-95 is a fission product, it can also produced by neutron irradiation of Zr-94. Zr-96 has been used for the production of the radioisotope Zr-97. Zr-90 can be used for the production of the PET isotope Nb-90. Finally, Zr-90 has been proposed for cladding in nuclear fuel. The use of Zr-90 would lower even further the already low neutron absorption cross section of natural Zr that is currently used as fuel cladding.

Table. Stables isotopes of cobalt.
Isotope Mass / Da Natural
abundance
(atom %)
Nuclear
spin (I)
Nuclear
magnetic
moment (μ/μN)
90Zr 89.9047026 (26) 51.45 (40) 0
91Zr 90.9056439 (26) 11.22 (5) 5/2 -1.30362
92Zr 91.9050386 (26) 17.15 (8) 0
94Zr 93.9063148 (28) 17.38 (28) 0
96Zr 95.908275 (4) 2.80 (9) 0

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