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Praseodymium
Praseodymium

Niobium
Niobium



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Praseodymium
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Niobium

Physical Properties of Praseodymium and Niobium

Physical

Melting Point

935.00 °C2,468.00 °C
-38.83 3410
👆🏻

Boiling Point

3,130.00 °C2,468.00 °C
0 5660
👆🏻

Appearance

Physical State

Solid
Solid

Color

Grayish White
Gray

Luster

Metallic
Metallic

Hardness

Mohs Hardness

4.006.00
0.2 8.5
👆🏻

Brinell Hardness

481.00 MPa735.00 MPa
0.14 3490
👆🏻

Vickers Hardness

400.00 MPa870.00 MPa
0 3920
👆🏻

Speed of Sound

2,280.00 m/s3,480.00 m/s
818 16200
👆🏻

Optical Properties

Refractive Index

1.642.30
0.155 3.41
👆🏻

Reflectivity

60.00 %70.00 %
5 97
👆🏻

Allotropes

α Allotropes

-
-

β Allotropes

-
-

γ Allotropes

-
-