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Lanthanum
Lanthanum

Niobium
Niobium



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Lanthanum
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Niobium

Physical Properties of Lanthanum and Niobium

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Physical

Melting Point

920.00 °C2,468.00 °C
-38.83 3410
👆🏻

Boiling Point

3,469.00 °C2,468.00 °C
0 5660
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Appearance

Physical State

Solid
Solid

Color

Silvery White
Gray

Luster

-
Metallic

Hardness

Mohs Hardness

2.506.00
0.2 8.5
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Brinell Hardness

350.00 MPa735.00 MPa
0.14 3490
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Vickers Hardness

360.00 MPa870.00 MPa
0 3920
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Speed of Sound

2,475.00 m/s3,480.00 m/s
818 16200
👆🏻

Optical Properties

Refractive Index

1.802.30
0.155 3.41
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Reflectivity

70.00 %70.00 %
5 97
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Allotropes

α Allotropes

-
-

β Allotropes

-
-

γ Allotropes

-
-