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Cobalt
Cobalt

Barium
Barium



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Cobalt
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Barium

Physical Properties of Cobalt and Barium

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Physical

Melting Point

1,495.00 °C725.00 °C
-38.83 3410
👆🏻

Boiling Point

2,870.00 °C1,140.00 °C
0 5660
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Appearance

Physical State

Solid
Solid

Color

Gray
Silvery Gray

Luster

Metallic
-

Hardness

Mohs Hardness

5.001.25
0.2 8.5
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Brinell Hardness

470.00 MPa130.00 MPa
0.14 3490
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Vickers Hardness

1,043.00 MPa210.00 MPa
0 3920
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Speed of Sound

4,720.00 m/s1,620.00 m/s
818 16200
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Optical Properties

Refractive Index

2.501.47
0.155 3.41
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Reflectivity

67.00 %65.00 %
5 97
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Allotropes

α Allotropes

α-Cobalt
-

β Allotropes

β-Cobalt
-

γ Allotropes

-
-