Rubidium, Rb

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Rubidium, Rb
Categories:	Metal; Nonferrous Metal; Pure Element
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Physical Properties	Original Value	Comments

Density	1.45 g/cc @Temperature 220 °C
	1.46 g/cc @Temperature 150 °C
	1.47 g/cc @Temperature 50.0 °C
	1.475 g/cc @Temperature 39.0 °C
	1.532 g/cc @Temperature 20.0 °C
Vapor Pressure	0.001333 bar @Temperature 294 °C
	0.01333 bar @Temperature 387 °C
	0.1333 bar @Temperature 519 °C
	0.2666 bar @Temperature 569 °C
	0.5333 bar @Temperature 628 °C
Surface Tension	46.8 dynes/cm @Temperature 632 °C
	51 dynes/cm @Temperature 550 °C
	80 dynes/cm @Temperature 100 °C
	84.7 dynes/cm @Temperature 39.0 °C

Chemical Properties	Original Value	Comments
Atomic Mass	85.4678	1995
Atomic Number	37
Thermal Neutron Cross Section	0.70 barns/atom
X-ray Absorption Edge	0.81549 Å	K
	6.006 Å	L_I
	6.6538 Å	L_II
	6.8752 Å	L_III
Critical Temperature	1820 °C
Electrode Potential	-2.90 V
Electronegativity	0.82	Pauling
Ionic Radius	1.47 Å	Crystal Ionic Radius for Valence +1

Mechanical Properties	Original Value	Comments
Modulus of Elasticity	2.35 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000125 ohm-cm
	0.00001154 ohm-cm @Temperature 0.000 °C
	0.00001284 ohm-cm @Temperature 20.0 °C
	0.0000137 ohm-cm @Temperature 39.9 °C	solid
	0.0000220 ohm-cm @Temperature 39.9 °C	liquid
	0.00002747 ohm-cm @Temperature 100 °C	liquid
Magnetic Susceptibility	2.0e-7	cgs/g

Thermal Properties	Original Value	Comments
Heat of Fusion	25.5 J/g
Heat of Vaporization	888 J/g
CTE, linear	90.0 µm/m-°C @Temperature 20.0 °C
Specific Heat Capacity	0.336 J/g-°C
Thermal Conductivity	33.3 W/m-K @Temperature 38.89 °C	liquid
	58.1 W/m-K @Temperature 38.89 °C	solid
	58.2 W/m-K @Temperature 25.0 °C	solid
	58.3 W/m-K @Temperature 0.000 °C	solid
Melting Point	38.89 °C
Boiling Point	688 °C

Component Elements Properties	Original Value	Comments
Rubidium, Rb	100 %

Descriptive Properties
CAS Number	7440-17-7

References for this datasheet.

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