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Rulon Bearings

Neptunium, Np
Categories: Metal; Nonferrous Metal; Pure Element

Material Notes: Np-237 is the most stable isotope.

Physical Form: Silver Metal

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Physical PropertiesMetricEnglishComments
Density 20.48 g/cc0.7399 lb/in³from X-ray data
 
Chemical PropertiesMetricEnglishComments
Atomic Mass 237237Longest-Lived Isotope (1995)
Atomic Number 9393
X-ray Absorption Edge 0.10487 Å0.10487 ÅK
 0.55314 Å0.55314 ÅLI
 0.57415 Å0.57415 ÅLII
 0.70391 Å0.70391 ÅLIII
Electronegativity 1.31.3Pauling
Ionic Radius 0.710 Å0.710 ÅCrystal Ionic Radius for Valence +7
 0.950 Å0.950 ÅCrystal Ionic Radius for Valence +4
 1.10 Å1.10 ÅCrystal Ionic Radius for Valence +3
 
Mechanical PropertiesMetricEnglishComments
Hardness, Vickers 346346
Bulk Modulus 118 GPa17100 ksi
Shear Modulus 80.0 GPa11600 ksi
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.000164 ohm-cm0.000164 ohm-cm
 
Thermal PropertiesMetricEnglishComments
Heat of Fusion 22.1 J/g9.51 BTU/lb
CTE, linear  27.5 µm/m-°C
@Temperature 40.0 - 240 °C
15.3 µin/in-°F
@Temperature 104 - 464 °F
Alpha Phase
 41.0 µm/m-°C
@Temperature 278 - 530 °C
22.8 µin/in-°F
@Temperature 532 - 986 °F
Beta Phase
Specific Heat Capacity 0.125 J/g-°C0.0299 BTU/lb-°FQuestionable Value
Melting Point 637 °C1180 °F
 
Component Elements PropertiesMetricEnglishComments
Neptunium, Np 100 %100 %
 
Descriptive Properties
CAS Number7439-99-8
SolubilitySoluble in HCl

References for this datasheet.

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AMENp00 / 73

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