Thorium, Th

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Thorium, Th
Categories:	Metal; Nonferrous Metal; Pure Element
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Physical Properties	Metric	English	Comments

Density	11.3 g/cc	0.408 lb/in³

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

Mechanical Properties	Metric	English	Comments
Hardness, Vickers	35 - 114	35 - 114	References report a wide range of values
Tensile Strength, Ultimate	219 MPa	31800 psi	as cast; 0.02 to 0.08% C
Tensile Strength, Yield	144 MPa @Strain 0.2 %	20900 psi @Strain 0.2 %
Elongation at Break	34 %	34 %
Modulus of Elasticity	73.1 GPa	10600 ksi
Compressive Strength	220 MPa	31900 psi	Approximately equal to tensile
Bulk Modulus	57.7 GPa	8370 ksi
Poissons Ratio	0.27	0.27
Fatigue Strength	97.0 MPa	14100 psi	reversed bend test endurance limit
Shear Modulus	28.0 GPa	4060 ksi

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

Thermal Properties	Metric	English	Comments
Heat of Fusion	82.9 J/g	35.7 BTU/lb
Heat of Vaporization	2617 J/g	1126 BTU/lb
CTE, linear	11.1 µm/m-°C @Temperature 20.0 °C	6.17 µin/in-°F @Temperature 68.0 °F
	12.6 µm/m-°C @Temperature 600 °C	7.00 µin/in-°F @Temperature 1110 °F
	14.9 µm/m-°C @Temperature 950 °C	8.28 µin/in-°F @Temperature 1740 °F
Specific Heat Capacity	0.09261 J/g-°C @Temperature -193 °C	0.02213 BTU/lb-°F @Temperature -315 °F
	0.09779 J/g-°C @Temperature -173 °C	0.02337 BTU/lb-°F @Temperature -279 °F
	0.1016 J/g-°C @Temperature -153 °C	0.02428 BTU/lb-°F @Temperature -243 °F
	0.1061 J/g-°C @Temperature -113 °C	0.02536 BTU/lb-°F @Temperature -171 °F
	0.1089 J/g-°C @Temperature -73.0 °C	0.02603 BTU/lb-°F @Temperature -99.4 °F
	0.1108 J/g-°C @Temperature -23.0 °C	0.02648 BTU/lb-°F @Temperature -9.40 °F
	0.1132 J/g-°C @Temperature 27.0 °C	0.02705 BTU/lb-°F @Temperature 80.6 °F
	0.1167 J/g-°C @Temperature 127 °C	0.02789 BTU/lb-°F @Temperature 261 °F
	0.1202 J/g-°C @Temperature 227 °C	0.02873 BTU/lb-°F @Temperature 441 °F
	0.1239 J/g-°C @Temperature 327 °C	0.02961 BTU/lb-°F @Temperature 621 °F
	0.1278 J/g-°C @Temperature 427 °C	0.03054 BTU/lb-°F @Temperature 801 °F
	0.132 J/g-°C @Temperature 527 °C	0.0315 BTU/lb-°F @Temperature 981 °F
	0.1364 J/g-°C @Temperature 627 °C	0.03260 BTU/lb-°F @Temperature 1160 °F
	0.141 J/g-°C @Temperature 727 °C	0.0337 BTU/lb-°F @Temperature 1340 °F
Thermal Conductivity	37.7 W/m-K	262 BTU-in/hr-ft²-°F
Melting Point	1800 °C	3270 °F
Boiling Point	4788 °C	8650 °F

Optical Properties	Metric	English	Comments
Emissivity (0-1)	0.30 @Temperature 1127 °C	0.30 @Temperature 2061 °F	total spectrum

Component Elements Properties	Metric	English	Comments
Thorium, Th	100 %	100 %

Descriptive Properties
CAS Number	7440-29-1

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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