Physical Properties of Hafnium and Rhenium
Physical Properties
Melting Point
2,150.00 °C
10
3,180.00 °C
2
Boiling Point
5,400.00 °C
5
5,627.00 °C
2
Appearance
Physical State
Solid
Solid
Color
Gray
Silvery Gray
Luster
Metallic
Metallic
Hardness
Mohs Hardness
5.50
7
7.00
3
Brinell Hardness
1,450.00 MPa
6
1,320.00 MPa
8
Vickers Hardness
1,520.00 MPa
5
1,350.00 MPa
7
Speed of Sound
3,010.00 m/s
27
4,700.00 m/s
15
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
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