72 178.490
Hf
Hafnium

Hafnium , Hf

Hafnium is a chemical element that has the symbol Hf and atomic number 72. A lustrous, silvery gray tetravalent transition metal, hafnium resembles zirconium chemically and it is found in zirconium minerals. Hafnium is used in tungsten alloys in filaments and electrodes, in integrated circuits as a gate insulator for transistors, and as a neutron absorber in control rods in nuclear power plants.

 

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H1-5005-M
HfF4 Pieces 3-6mm (sintered) 99.9% PureHafnium Fluoride
H1-5006-M
HfO2 Pieces 3-12mm (white sintered) 99.9% PureHafnium Oxide
H1-5010-M
HfO2 Tables 10mm x 8mm (White) 99.99+% PureHafnium Oxide
H1-5011-M
HfO2 Pieces 1-6mm (white) 99.9% PureHafnium Oxide
H1-5012-M
HfO2 Pieces 1-6mm 99.99% PureHafnium Oxide
H1-5015-M
HfO2 Pieces 1-4mm 99.99% Pure (sintered black)Hafnium Oxide
H1-5018-M
Hf Pellets 6mm dia. x 6mm long 99.9% PureHafnium
H1-5024-M
Hf Pieces 3-6mm 99.99% PureHafnium Metal
H1-5025-M
Hf Pieces 3-12mm 99.95% PureHafnium Metal
H1-5026-M
Hf Pieces 1-3mm 99.95% PureHafnium Metal
H1-10003-P
HfB2 Powder 1-3 MicronsHafnium Boride
H1-10007-P
HfC -150 +325 Mesh 99.5% PureHafnium Carbide
H1-10008-P
HfC -325 +10um 99.50% PureHafnium Carbide
H1-10009-P
HfC -325 (typ. =10 microns) 99.5% PureHafnium Carbide
H1-10010-P
HfCl4 -80 Mesh 99% PureHafnium Chloride
H1-10011-P
HfF4 -4 Mesh 99.997% PureHafnium Fluoride
H1-10012-P
HfF4 -60 Mesh (precipitated) 99.9% PureHafnium Fluoride
H1-10015-P
HfN -325 Mesh (typ. =10 microns) 99.5% PureHafnium Nitride
H1-10016-P
HfO2 -200 Mesh 99% PureHafnium Oxide
H1-10017-P
HfO2 -325 Mesh (typ. =10 microns) 99.999% PureHafnium Oxide
H1-10018-P
HfO2 -325 Mesh (typ. =10 microns) 99.95% PureHafnium Oxide
H1-10028-P
HfSe2 -325 Mesh (typ. =10 microns) 99.5% PureHafnium Selenide
H1-10030-P
HfS -200 Mesh 99.9% PureHafnium Sulphide
H1-10031-P
HfTe2 -325 Mesh (typ. =10 microns) 99.5% PureHafnium Telluride
H1-10033-P
HfCl4 Powder 99.5% PureHafnium Chloride
H1-10034-P
HfO2 ~30 microns 99.99% PureHafnium Oxide
H1-2000-R

Hf Rod 1.58mm diameter 99.9% pure

Hafnium

H1-2000-R1
Hf Rod 1.58mm dia. x 100mm long 99.9% PureHafnium
H1-2000-R2
Hf Rod 2mm dia. x 27mm long 99.95% PureHafnium
H1-2001-R

Hf Rod 3.18mm diameter 99.9% pure

Hafnium

H1-2002-R

Hf Rod 6.35mm diameter 99.9% pure

Hafnium

H1-2003-R

Hf Rod 12.7mm diameter 99.9% pure

Hafnium

H1-2004-R

Hf Rod 15.88mm diameter 99.9% pure

Hafnium

H1-2004-R1
Hf Rod 15.88mm dia. x 100mm long 99.9% PureHafnium
H1-2005-R

Hf Rod 19.05mm diameter 99.9% pure

Hafnium

H1-2006-R

Hf Rod 25.4mm diameter 99.9% pure

Hafnium

H1-2006-R1
Hf Rod 25.4mm dia x 50.8mm long 99.9% PureHafnium
H1-9002-D2
HfC Rod 1.3mm dia. x 2.8mm long 99.5% PureHafnium carbide
$6.60/PCS
60 PCS in stock
Select Qty
H1-9002-D3
HfC Rod 2.1mm dia. x 2.8mm long 99.5% PureHafnium carbide
$6.60/PCS
60 PCS in stock
Select Qty
H1-9002-D4
HfC Rod 2.2mm dia. x 2.8mm long 99.5% PureHafnium carbide
$6.60/PCS
60 PCS in stock
Select Qty
H1-9002-D6
HfC Rod 1.6mm dia. x 3.0mm long 99.5% PureHafnium carbide
$6.60/PCS
80 PCS in stock
Select Qty
H1-9002-D7
HfC Rod 2.0mm dia. x 4.0mm long 99.5% PureHafnium carbide
H1-9002-D8
HfC Rod 1.2mm dia. x 3.2mm long 99.5% PureHafnium carbide
HF-SHT-0.5

Hf Sheet Thickness 0.5mm (0.020")

Purity 99.9%, Hafnium

HF-SHT-1

Hf Sheet Thickness 1.0mm (0.040")

Purity 99.9%, Hafnium

HF-SHT-1.5

Hf Sheet Thickness 1.5mm (0.060")

Purity 99.9%, Hafnium

HF-SHT-12.7

Hf Sheet Thickness 12.7mm (0.500")

Purity 99.9%, Hafnium

HF-SHT-3.18

Hf Sheet Thickness 3.18m (0.125")

Purity 99.9%, Hafnium

HF-SHT-6.35

Hf Sheet Thickness 6.3mm (0.250")

Purity 99.9%, Hafnium

H1-9000-D

Hafnium Hf,

Available purities 99.9%, 99.95% as standard, 99.99%+ possible

H1-9001-D

Hafnium Selenide HfSe2, Purity 99.9%

H1-9002-D

Hafnium carbide HfC, Purity 99.5%

H1-9003-D

Hafnium diboride HfB2, Purity 99.9%

H1-9004-D

Hafnium oxide HfO2,

Available purities 99.9% & 99.99%

H1-9010-D

Hafnium oxide-Yttrium oxide HfO2-Y2O3,

Available in various ratios wt% or at%, Purity 99.99%

H1-9011-D

Hafnium-Silicon oxide HfSiO4,

Purity 99.95%

H1-9012-D

Hafnium nitride HfN, Purity 99.5%

H1-9013-D

Hafnium-Zirconium-Titanium-Tantalum Hf-Zr-Ti-Ta,

Available in various ratios wt% or at%, Purity 99.5%

H1-9014-D

Hafnium-Zirconium-Titanium-Niobium Hf-Zr-Ti-Nb,

Available in various ratios wt% or at%, Purity 99.5%

H1-9015-D

Hafnium-Zirconium-Titanium-Vanadium Hf-Zr-Ti-V,

Available in various ratios wt% or at%, Purity 99.5%

H1-9016-D
Hafnium-Zirconium-Titanium-Tantalum-Niobium Hf-Zr-Ti-Ta-Nb, Available in various ratios wt% or at%, Purity 99.5%
H1-9017-D

Hafnium-Zirconium-Titanium-Tantalum-Vanadium Hf-Zr-Ti-Ta-V,

Available in various ratios wt% or at%, Purity 99.5%

H1-9018-D

Hafnium-Zirconium-Titanium-Tantalum-Niobium-Vanadium Hf-Zr-Ti-Ta-Nb-V,

Available in various ratios wt% or at%, Purity 99.5%

H1-9019-D

Hafnium oxide-Zirconium oxide HfO2-ZrO2,

Available in various ratios wt% or at%, Purity 99.95% & 99.99%

Hafnium

Hafnium oxide-Zirconium oxide HfO2 - ZrO2, Available in various ratios wt% or at%, Purity 99.95% & 99.99%

HF-F-0.1

Hf Foil Thickness 0.1mm (0.004") Purity 99.9%

Hafnium

HF-F-0.2

Hf Foil Thickness 0.2mm (0.008") Purity 99.9%

Hafnium

H1-9001-D1
HfSe2 TRG 25.4mm dia. x 6.35mm Tk 99.9% PureHafnium Selenide
H1-9002-D9
HfC TRG 76.2mm dia. x 6.35mm Tk 99.5% PureHafnium carbide
H1-9004-D10

HfO2 TRG 50.8mm dia. x 3mm Tk 99.95% Pure

Hafnium Oxide

H1-9004-D11
HfO2 TRG 50.8mm dia. x 6.35mm Tk 99.99% PureHafnium oxide
H1-9004-D13
HfO2 TRG 101.6mm dia. x 3.18mm Tk 99.99% PureHafnium oxide
H1-9004-D14
HfO2 TRG 101.6mm dia. x 3mm Tk 99.99% PureHafnium oxide
H1-9004-D16
HfO2 TRG 76.2mm dia. x 3.18mm Tk 99.99% PureHafnium oxide
H1-9004-D17
HfO2 TRG 76.2mm dia. x 3.18mm Tk 99.9% PureHafnium oxide
H1-9004-D19
HfO2 TRG 50.8mm dia. x 4mm Tk 99.99% PureHafnium oxide
H1-9004-D2
HfO2 TRG 50.8mm dia. x 2mm Tk 99.99% PureHafnium oxide
H1-9004-D20
HfO2 TRG 25.4mm dia. x 6.35mm Tk 99.9% PureHafnium oxide
H1-9004-D4
HfO2 TRG 76.2mm dia. x 3mm Tk 99.99% PureHafnium oxide
H1-9004-D7
HfO2 TRG 76.2mm dia. x 6.35mm Tk 99.99% PureHafnium oxide
H1-9004-D9
HfO2 TRG 50.8mm dia. x 3.18mm Tk 99.99% PureHafnium oxide
$323.40/PCS
2 PCS in stock
Select Qty
H1-9012-D1
HfN TRG 76.2mm dia. x 6.35mm Tk 99.5% PureHafnium nitride
HF-ST-1-3-3N
Hf TRG 25.4mm dia. x 3mm Tk 99.9% PureHafnium
$112.20/PCS
2 PCS in stock
Select Qty
HF-ST-1-6-3N
Hf TRG 25.4mm dia. x 6mm Tk 99.9% Pure(Zr <0.5%)Hafnium
$163.68/PCS
2 PCS in stock
Select Qty
HF-ST-2-3-3N
Hf TRG 50.8mm dia. x 3mm Tk 99.9% PureHafnium
HF-ST-2-6-3N
Hf TRG 50.8mm dia. x 6mm Tk 99.9% Pure(Zr <0.5%)Hafnium
HF-ST-3-3-3N
Hf TRG 76.2mm dia. x 3mm Tk 99.9% Pure(Zr <0.5%)Hafnium
$554.40/PCS
2 PCS in stock
Select Qty
HF-ST-3-6-3N
Hf TRG 76.2mm dia. x 6mm Tk 99.9% Pure(Zr <0.5%)Hafnium
HF-ST-4-3-3N
Hf TRG 101.6mm dia. x 3mm Tk 99.9% PureHafnium
HF-ST-4-6-3N
Hf TRG 101.6mm dia. x 6mm Tk 99.9% Pure(Zr <0.5%) Hafnium

Hafnium is a shiny silvery, ductile metal that is corrosion resistant and chemically similar to zirconium. The physical properties of hafnium are markedly affected by zirconium impurities, and these two elements are among the most difficult ones to separate. A notable physical difference between them is their density (zirconium being about half as dense as hafnium), but chemically the elements are extremely similar.

The most notable physical property of hafnium is that it has a very high neutron-capture cross-section, and several isotopes of hafnium nuclei can 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.)

Separation of hafnium and zirconium becomes very important in the nuclear power industry, since zirconium is a good fuel-rod cladding metal, with the desirable properties of a very low neutron capture cross-section, and a 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 materials applications. Thus a nearly-complete separation of zirconium and hafnium is necessary for their use in nuclear power.

Hafnium carbide is the most refractory binary compound known, with a melting point >3890 °C, and hafnium nitride is the most refractory of all known metal nitrides, with a melting point of 3310 °C. This has led to proposals that hafnium or its carbides might be useful as construction materials that are subjected to very high temperatures.

Symbol Hf
Atomic Number 72
No. of naturally occurring isotopes 6
Atomic weight 178.49
Electronic configuration [Xe]4f145d26s2
Metal radius/pm 159
Ionic radius(6-coordinate)/pm IV 71
Ionization energy/kJmolI 642
Ionization energy/kJmolII 1440
Ionization energy/kJmolIII 2250
Density (25°C)/gcm 13.28
Melting point / C 2222(2467)
Boiling point / C 4450
ΔHfus/kJmol-1 -25
ΔHvap/kJmol-1 571 (+/-25)
ΔHf(monoatomic gas)/kJmol-1 611(+/-17)
Electronegativity χ 1.3
Electrical resistivity
(20°C)/μohm cm 35.1
Temperature (oC) @Vap. Pressure
10-8 Torr 2160
10-6 Torr 2250
10-4 Torr 3090
Techniques
Electron Beam Good
Crucible -
Coil -
Boat -
Remarks
-