hafnium

72 lutetium ← hafnium → tantalum Zr ↑ Hf ↓ Rf Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	hafnium, Hf, 72
Element category	transition metals
Group, Period, Block	4, 6, d
Appearance	steel grey
Standard atomic weight	178.49(2)  g·mol−1
Electron configuration	[Xe] 4f14 5d2 6s2
Electrons per shell	2, 8, 18, 32, 10, 2
Physical properties
Phase	solid
Density (near r.t.)	13.31  g·cm-3
Liquid density at m.p.	12  g·cm−3
Melting point	2506 K (2233 °C, 4051 °F)
Boiling point	4876 K (4603 °C, 8317 °F)
Heat of fusion	27.2  kJ·mol−1
Heat of vaporization	571  kJ·mol−1
Specific heat capacity	(25 °C) 25.73  J·mol−1·K−1
Vapor pressure P(Pa) 1 10 100 1 k 10 k 100 k at T(K) 2689 2954 3277 3679 4194 4876
Atomic properties
Crystal structure	hexagonal
Oxidation states	4 (amphoteric oxide)
Electronegativity	1.3 (Pauling scale)
Ionization energies (more)	1st:  658.5  kJ·mol−1
	2nd:  1440  kJ·mol−1
	3rd:  2250  kJ·mol−1
Atomic radius	155  pm
Atomic radius (calc.)	208  pm
Covalent radius	150  pm
Miscellaneous
Magnetic ordering	paramagnetic[1]
Electrical resistivity	(20 °C) 331 n Ω·m
Thermal conductivity	(300 K) 23.0  W·m−1·K−1
Thermal expansion	(25 °C) 5.9  µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 3010 m/s
Young's modulus	78  GPa
Shear modulus	30  GPa
Bulk modulus	110  GPa
Poisson ratio	0.37
Mohs hardness	5.5
Vickers hardness	1760  MPa
Brinell hardness	1700  MPa
CAS registry number	7440-58-6
Most-stable isotopes
Main article: Isotopes of hafnium iso NA half-life DM DE (MeV) DP 172Hf syn 1.87 y ε 0.350 172Lu 174Hf 0.162% 2×1015 y α 2.495 170Yb 176Hf 5.206% 176Hf is stable with 104 neutrons 177Hf 18.606% 177Hf is stable with 105 neutrons 178Hf 27.297% 178Hf is stable with 106 neutrons 178m2Hf syn 31 y IT 2.446 178Hf 179Hf 13.629% 179Hf is stable with 107 neutrons 180Hf 35.1% 180Hf is stable with 108 neutrons 182Hf syn 9×106 y β- 0.373 182Ta
References

Hafnium (pronounced /ˈhæfniəm/) is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent, transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869. Hafnium was the second-to-last element of those with stable isotopes to be discovered. It was found by Dirk Coster and Georg von Hevesy in 1923 in Copenhagen, Denmark, and named it Hafnia after the Latin name for "Copenhagen".

Hafnium is used in filaments, electrodes, and some semiconductor fabrication processes for integrated circuits at 45nm and smaller feature lengths. Its large neutron capture cross-section makes hafnium a good material for neutron absorption in control rods in nuclear power plants. Some superalloys used for special applications contain hafnium in combination with niobium, titanium, or tungsten.

History

The hafnium seal of the Faculty of Science of the University of Copenhagen

In his report on The Periodic Law of the Chemical Elements, in 1869, Dmitri Mendeleev had implicitly predicted the existence of a heavier analog of titanium and zirconium. At the time of his formulation in 1871, Mendeleev believed that the elements were ordered by their atomic masses and placed lanthanum (element 57) in the spot below zirconium. The exact placement of the elements and the location of missing elements was done by determining the specific weight of the elements and comparing the chemical and physical properties.^[2]

The X-ray spectroscopy done by Henry Moseley in 1914 showed a direct dependency between spectral line and effective nuclear charge. This led to the nuclear charge, or atomic number of an element, being used to ascertain its place within the periodic table. With this method, Moseley determined the number of lanthanoids and showed the gaps in the atomic number sequence at numbers 43, 61, 72, and 75.^[3]

The discovery of the gaps led to an extensive search for the missing elements. In 1914, several people claimed the discovery after Henry Moseley predicted the gap in the periodic table for the then-undiscovered element 72.^[4] Georges Urbain asserted that he found element 72 in the rare earth elements in 1907 and published his results on celtium in 1911.^[5] Neither the spectra nor the chemical behavior matched with the element found later, and therefore his claim was turned down after a long standing controversy.^[6] The controversy was partly due to the fact that the chemists favored the chemical techniques which lead to the discovery of celtium, while the physicists relied on the use of the new x-ray spectroscopy method that proved that the substances discovered by Urbain did not contain element 72.^[6] By early 1923, several physicists and chemists such as Niels Bohr^[7] and Charles R. Bury^[8] suggested that element 72 should resemble zirconium and therefore was not part of the rare earth elements group. These suggestions were based on Bohr's theories of the atom, the X-ray spectroscopy of Mosley, and the chemical arguments of Friedrich Paneth.^[9]

Encouraged by these suggestions and by the reappearance in 1922 of Urbain's claims that element 72 was a rare earth element discovered in 1911, Dirk Coster and Georg von Hevesy were motivated to search for the new element in zirconium ores.^[10] Hafnium was discovered by the two in 1923 in Copenhagen, Denmark, validating the original 1869 prediction of Mendeleev.^[11][12] It was ultimately found in zircon in Norway through X-ray spectroscopy analysis.^[13] The place where the discovery took place led to the element being named for the Latin name for "Copenhagen", Hafnia, the home town of Niels Bohr. ^[14] Today, the Faculty of Science of the University of Copenhagen uses in its seal a stylized image of hafnium.^[15]

Hafnium was separated from zirconium through repeated recrystallization of the double ammonium or potassium fluorides by Valdemar Thal Jantzen and von Hevesey.^[16] Anton Eduard van Arkel and Jan Hendrik de Boer were the first prepare metallic hafnium by passing hafnium tetra-iodide vapor over a heated tungsten filament in 1924.^[17][18] This process for differential purification of zirconium and hafnium is still in use today.^[19]

In 1923, four predicted elements were still missing from the periodic table: 43 (technetium) and 61 (promethium) are radioactive elements and are only present in trace amounts in the environment,^[20] thus making elements 75 (rhenium) and 72 (hafnium) the last two unknown non-radioactive elements. Since rhenium was discovered in 1925,^[21] hafnium was the next to last element with stable isotopes to be discovered.

Characteristics

Hafnium Crystal Bar, mady by Crystal bar process

Hafnium is a shiny, silvery, ductile metal that is corrosion-resistant and chemically similar to zirconium.^[19] The physical properties of hafnium metal samples are markedly affected by zirconium impurities, as these two elements are among the most difficult ones to separate because of their chemical similarity.^[19] A notable physical difference between them is their density (zirconium being about half as dense as hafnium). The most notable physical property of hafnium is its high thermal neutron-capture cross-section, and the nuclei of several hafnium isotopes can each absorb multiple neutrons.^[19]Hafnium does react in air to form a protective film that prevents any further reaction(s).

Isotopes

At least 34 isotopes of hafnium have been observed, ranging in mass number from 153 to 186.^[22][23] The five stable isotopes are in the range of 176 to 180. The radioactive isotopes' half-lifes range from only 400 ms for ¹⁵³Hf,^[23] to 2.0 petayears (10¹⁵ years) for the most stable one, ¹⁷⁴Hf.^[22]

The nuclear isomer ^178m2Hf is also a source of cascades of gamma rays whose energies total 2.45 MeV per decay.^[24] It is notable because it has the highest excitation energy of any comparably long-lived isomer of any element. One gram of this pure isotope could release approximately 1330 megajoules of energy, the equivalent of exploding about 317 kilograms (700 pounds) of TNT. Possible applications requiring such highly concentrated energy storage are of interest. For example, it has been studied as a possible power source for gamma ray lasers.^[25]

Chemistry

Hafnium dioxide

As a tetravalent transition metal, hafnium forms various inorganic compounds, generally in the oxidation state of +4. The metal is resistant to concentrated alkalis, but halogens react with it to form hafnium tetrahalides.^[26] At higher temperatures, hafnium reacts with oxygen, nitrogen, carbon, boron, sulfur, and silicon.^[26] Due to the lanthanide contraction of the elements in the fifth period, zirconium and hafnium have nearly identical ionic radii. The ionic radius of Zr⁴⁺ is 0.79 Ångström and that of Hf⁴⁺ is 0.78 Ångström.^[26]

This similarity results in nearly identical chemical behavior and in the formation of similar chemical compounds.^[26] The chemistry of hafnium is so similar to that of zirconium that a separation on chemical reactions was not possible, only the physical properties of the compounds differ. The melting points and boiling points of the compounds and the solubility in solvents are the major differences in the chemistry of these twin elements.^[27]

Like zirconium, hafnium reacts with halogens forming the tetrahalogen compound with the oxidation state of +4 for hafnium. Hafnium(IV) chloride and hafnium(IV) iodide have some applications in the production and purification of hafnium.^[27] The white hafnium oxide (HfO₂), with a melting point of 2812 °C and a boiling point of roughly 5100 °C, is very similar to zirconia, but slightly basic.^[27] Hafnium carbide is the most refractory binary compound known, with a melting point over 3890 °C, and hafnium nitride is the most refractory of all known metal nitrides, with a melting point of 3310 °C.^[26] This has led to proposals that hafnium or its carbides might be useful as construction materials that are subjected to very high temperatures. The mixed carbide tantalum hafnium carbide (Ta₄HfC₅) possesses the highest melting point of any currently known compound, 4215 °C.^[28]

Occurrence

Zircon crystal from Tocantins, Brazil (unknown scale)

Hafnium is estimated to make up about 5.8 ppm of the Earth's upper crust by weight. It does not exist as a free element in nature, but is found combined in solid solution for zirconium in natural zirconium compounds such as zircon, ZrSiO₄, which usually has a about 1 - 4 % of the Zr replaced by Hf. Rarely, the Hf/Zr ratio increases during crystallization to give the isostructural mineral 'hafnon' (Hf,Zr)SiO₄, with atomic Hf > Zr.^[29] An old (obsolete) name for a variety of zircon containing unusually high Hf content is alvite ^[30]

A major source of zircon (and hence hafnium) ores are heavy mineral sands ore deposits, pegmatites particularly in Brazil and Malawi, and carbonatite intrusions particularly the Crown Polymetallic Deposit at Mount Weld, Western Australia. A potential source of hafnium is trachyte tuffs containing rare zircon-hafnium silicates eudialyte or armstrongite, at Dubbo in New South Wales, Australia.^[31]

Production

The heavy mineral sands ore deposits of the titanium ores ilmenite and rutile yield most of the mined zirconium and therefore also most the hafnium.^[32]

Zirconium is a good fuel-rod cladding metal, with the desirable properties of a very low neutron capture cross-section and good chemical stability at high temperatures. However, because of hafnium's neutron-absorbing properties, hafnium impurities in zirconium would cause it to be far less useful for nuclear reactor applications. Thus a nearly complete separation of zirconium and hafnium is necessary for their use in nuclear power. The production of hafnium free zirconium is the main source for hafnium.^[19]

A lump of hafnium which has been oxidized on one side and exhibits thin film optical effects.

Several details contribute to fact that there are only a few technical uses for hafnium. First, the close similarity between hafnium and zirconium makes it possible to use zirconium for most of the applications. Second, hafnium was first available as pure metal after the use in the nuclear industry for hafnium-free zirconium in the late 1950s. Furthermore, the low abundance and the difficult separation techniques necessary make it a scarce commodity.^[19]

Hafnium and zirconium have nearly identical chemistry, which makes the two difficult to separate.^[33] The first used methods of fractionated crystallization of ammonium fluoride salts^[16] or the fractionated distillation of the chloride^[17] were not suitable for an industrial scale production. After zirconium was chosen as material for the nuclear reactor program in the 1940s, a separation method had to be developed. Liquid-liquid extraction processes with a wide variety of solvents were developed and are still used for the production of hafnium.^[34] About half of all hafnium metal manufactured is produced as a by-product of zirconium refinement. The end product of the separation is hafnium(IV) chloride.^[35] The conversion to the metal is done through reducing hafnium(IV) chloride with magnesium or sodium in the Kroll process.^[36]

HfCl₄ + 2Mg (1100 °C) → 2MgCl₂ + Hf

Further purification is done by a chemical transport reaction developed by Arkel and de Boer. In a closed vessel, hafnium reacts with iodine at temperatures of 500 °C forming hafnium(IV) iodide; at a tungsten filament of 1700 °C the reverse reaction happens and the iodine and hafnium are set free. The hafnium forms a solid coating at the tungsten filament and the iodine can react with additional hafnium resulting in a steady turn over.^[18][27]

Hf + 2I₂ (500 °C) → HfI₄

HfI₄ (1700 °C) → Hf + 2I₂

Applications

Most of the hafnium produced is used in the production of control rod for nuclear reactors.^[34]

Nuclear reactors

The nuclei of several hafnium isotopes can each absorb multiple neutrons. This makes hafnium a good material for use in the control rods for nuclear reactors. Its neutron-capture cross-section is about 600 times that of zirconium. (Other elements that are good neutron-absorbers for control rods are cadmium and boron.) Excellent mechanical properties and exceptional corrosion-resistance properties allow its use in the harsh environment of a pressurized water reactors.^[34] The German research reactor FRM II uses hafnium as a neutron absorber.^[37]

Alloys

Hafnium containing rocket nozzle of the Apollo Lunar Module in the lower right corner

Hafnium is used in iron, titanium, niobium, tantalum, and other metal alloys. An alloy used for liquid rocket thruster nozzles, for example the main engine of the Apollo Lunar Modules is C103, which consists of 89% niobium, 10% hafnium and 1% titanium.^[38]

Small additions of hafnium increase the adherence of protective oxide scales on nickel based alloys. It improves thereby the corrosion resistance especially under cyclic temperature conditions that tend to break oxide scales by inducing thermal stresses between the bulk material and the oxide layer.^[39][40][41]

Other uses

Due to its heat resistance and its affinity to oxygen and nitrogen, hafnium is a good scavenger for oxygen and nitrogen in gas-filled and incandescent lamps. Hafnium is also used as the electrode in plasma cutting because of its ability to shed electrons into air,^[42] The electronics industry discovered that hafnium-based compound can be employed in gate insulators in the 45 nm generation of integrated circuits from Intel, IBM and others.^[43][44] Hafnium oxide-based compounds are practical high-k dielectrics, allowing reduction of the gate leakage current which improves performance at such scales.^[45][46]

The high energy content of ^178m2Hf is the concern of a DARPA funded program in the US. This program should determine the possibility of using a nuclear isomer of hafnium (the above mentioned ^178m2Hf) to construct high yield weapons with x-ray triggering mechanisms—an application of induced gamma emission. That work follows over two decades of basic research by an international community^[47] into the means for releasing the stored energy upon demand. There is considerable opposition to this program^[48] because uninvolved countries might perceive an "isomer weapon gap" that would justify their further development and stockpiling of nuclear weapons. A related proposal is to use the same isomer to power Unmanned Aerial Vehicles,^[49] which could remain airborne for months at a time.

Precautions

Dragon's Breath at night

Care needs to be taken when machining hafnium because, like its sister metal zirconium, when hafnium is divided into fine particles, it is pyrophoric and can ignite spontaneously in air—similar to that obtained in Dragon's Breath. Compounds that contain this metal are rarely encountered by most people. The pure metal is not considered toxic, but hafnium compounds should be handled as if they were toxic because the ionic forms of metals are normally at greatest risk for toxicity, and limited animal testing has been done for hafnium compounds.^[50]

See also

• Nuclear isomer
• Induced gamma emission
• Zircon

References

External links

Wikimedia Commons has media related to: Hafnium

Look up hafnium in Wiktionary, the free dictionary.

• WebElements.com – Hafnium
• Hafnium Technical & Safety Data
• NLM Hazardous Substances Databank – Hafnium, elemental
• Intel Shifts from Silicon to Lift Chip Performance
• Hafnium-based Intel 45nm Process Technology