Thorium, Th

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Thorium, Th
Categories:	Metal; Nonferrous Metal; Pure Element
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Physical Properties	Original Value	Comments

Density	11.3 g/cc

Chemical Properties	Original Value	Comments
Atomic Mass	232.0381	1995
Atomic Number	90
X-ray Absorption Edge	0.1129 Å	K
	0.6061 Å	L_I
	0.6301 Å	L_II
	0.76151 Å	L_III
Electrode Potential	-2.10 V
Electronegativity	1.3	Pauling
Ionic Radius	1.02 Å	Crystal Ionic Radius for Valence +4

Mechanical Properties	Original Value	Comments
Hardness, Vickers	35 - 114	References report a wide range of values
Tensile Strength, Ultimate	219 MPa	as cast; 0.02 to 0.08% C
Tensile Strength, Yield	144 MPa @Strain 0.2 %
Elongation at Break	34 %
Modulus of Elasticity	73.1 GPa
Compressive Strength	220 MPa	Approximately equal to tensile
Bulk Modulus	57.7 GPa
Poissons Ratio	0.27
Fatigue Strength	97.0 MPa	reversed bend test endurance limit
Shear Modulus	28.0 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000130 ohm-cm
Magnetic Susceptibility	-1.10e-7	cgs/g
Critical Magnetic Field Strength, Oersted	157 - 163
Critical Superconducting Temperature	1.36 - 1.40 K

Thermal Properties	Original Value	Comments
Heat of Fusion	82.9 J/g
Heat of Vaporization	2617 J/g
CTE, linear	11.1 µm/m-°C @Temperature 20.0 °C
	12.6 µm/m-°C @Temperature 600 °C
	14.9 µm/m-°C @Temperature 950 °C
Specific Heat Capacity	0.09261 J/g-°C @Temperature -193 °C
	0.09779 J/g-°C @Temperature -173 °C
	0.1016 J/g-°C @Temperature -153 °C
	0.1061 J/g-°C @Temperature -113 °C
	0.1089 J/g-°C @Temperature -73.0 °C
	0.1108 J/g-°C @Temperature -23.0 °C
	0.1132 J/g-°C @Temperature 27.0 °C
	0.1167 J/g-°C @Temperature 127 °C
	0.1202 J/g-°C @Temperature 227 °C
	0.1239 J/g-°C @Temperature 327 °C
	0.1278 J/g-°C @Temperature 427 °C
	0.132 J/g-°C @Temperature 527 °C
	0.1364 J/g-°C @Temperature 627 °C
	0.141 J/g-°C @Temperature 727 °C
Thermal Conductivity	37.7 W/m-K
Melting Point	1800 °C
Boiling Point	4788 °C

Optical Properties	Original Value	Comments
Emissivity (0-1)	0.30 @Temperature 1127 °C	total spectrum

Component Elements Properties	Original Value	Comments
Thorium, Th	100 %

Descriptive Properties
CAS Number	7440-29-1

References for this datasheet.

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