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Physical Properties of Hafnium and Niobium

Hafnium
Niobium
Physical Properties of Niobium and Hafnium


Physical Properties
Melting Point
2,150.00 °C   
10
2,468.00 °C   
6
Boiling Point
5,400.00 °C   
5
2,468.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
5.50   
7
6.00   
6
Brinell Hardness
1,450.00 MPa   
6
735.00 MPa   
14
Vickers Hardness
1,520.00 MPa   
5
870.00 MPa   
12
Speed of Sound
3,010.00 m/s   
27
3,480.00 m/s   
21
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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