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Physical Properties of Niobium and Tantalum

Niobium
Tantalum
Physical Properties of Tantalum and Niobium


Physical Properties
Melting Point
2,468.00 °C   
6
2,996.00 °C   
4
Boiling Point
2,468.00 °C   
99+
5,425.00 °C   
4
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Gray Blue   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.00   
6
6.50   
5
Brinell Hardness
735.00 MPa   
14
440.00 MPa   
28
Vickers Hardness
870.00 MPa   
12
870.00 MPa   
12
Speed of Sound
3,480.00 m/s   
21
3,400.00 m/s   
22
Optical Properties
  
  
Reflectivity
Not Available   
78.00 %   
6
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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