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7440-58-6
Hf
7200PL
99.95%
6 mm dia X 6 mm th.
231-166-4
Class 4.2
UN2545
PG II
Characteristic
Hafnium 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 many zirconium minerals.
Phase at STP：solid
Appearance：steel gray
Melting point：2506 K (2233 °C, 4051 °F)
Boiling point：4876 K (4603 °C, 8317 °F)
Density (near r.t.)：13.31 g/cm3
when liquid (at m.p.)：12 g/cm3
Heat of fusion：27.2 kJ/mol
Heat of vaporization：648 kJ/mol
Molar heat capacity：25.73 J/(mol·K)
Application
Hafnium is used in filaments and electrodes. Some semiconductor fabrication processes use its oxide for integrated circuits at 45 nm and smaller feature lengths. Some superalloys used for special applications contain hafnium in combination with niobium, titanium, or tungsten.
Characteristic
Hafnium 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 many zirconium minerals.
Phase at STP：solid
Appearance：steel gray
Melting point：2506 K (2233 °C, 4051 °F)
Boiling point：4876 K (4603 °C, 8317 °F)
Density (near r.t.)：13.31 g/cm3
when liquid (at m.p.)：12 g/cm3
Heat of fusion：27.2 kJ/mol
Heat of vaporization：648 kJ/mol
Molar heat capacity：25.73 J/(mol·K)
Application
Hafnium is used in filaments and electrodes. Some semiconductor fabrication processes use its oxide for integrated circuits at 45 nm and smaller feature lengths. Some superalloys used for special applications contain hafnium in combination with niobium, titanium, or tungsten.
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