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Physical Properties of Hafnium and Rhenium

Hafnium
Rhenium
Physical Properties of Rhenium and Hafnium


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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