Lanthanum, La

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Lanthanum, La
Categories:	Metal; Nonferrous Metal; Pure Element
Material Notes:
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Physical Properties	Metric	English	Comments

Density	6.166 g/cc	0.2228 lb/in³

Chemical Properties	Metric	English	Comments
Atomic Mass	138.9055	138.9055	1995
Atomic Number	57	57
X-ray Absorption Edge	0.31842 Å	0.31842 Å	K
	1.97892 Å	1.97892 Å	L_I
	2.1003 Å	2.1003 Å	L_II
	2.25792 Å	2.25792 Å	L_III
Electronegativity	1.1	1.1	Pauling
Ionic Radius	1.016 Å	1.016 Å	Crystal Ionic Radius for Valence +3
	1.39 Å	1.39 Å	Crystal Ionic Radius for Valence +1

Mechanical Properties	Metric	English	Comments
Hardness, Vickers	28	28
Tensile Strength, Ultimate	130 MPa	18900 psi
Tensile Strength, Yield	125 MPa	18100 psi
Elongation at Break	7.9 %	7.9 %
Tensile Modulus	36.6 GPa	5310 ksi
Bulk Modulus	27.9 GPa	4050 ksi
Poissons Ratio	0.28	0.28
Shear Modulus	14.3 GPa	2070 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000798 ohm-cm	0.0000798 ohm-cm
Magnetic Susceptibility	7.27e-7	7.27e-7	cgs/g
Critical Magnetic Field Strength, Oersted	800	800	or alpha phase
	1096	1096	beta phase
Critical Superconducting Temperature	9.20 K	9.20 K	~5.5-12.9 K from 0-21.0 GPa pressure; 4.88 for alpha phase. Value for ßLa is 6.00 K.

Thermal Properties	Metric	English	Comments
Heat of Fusion	44.6 J/g	19.2 BTU/lb
CTE, linear	12.1 µm/m-°C @Temperature 20.0 °C	6.72 µin/in-°F @Temperature 68.0 °F
Specific Heat Capacity	0.1641 J/g-°C	0.03923 BTU/lb-°F	Gas
	0.1951 J/g-°C	0.04663 BTU/lb-°F	Crystal
Thermal Conductivity	14.0 W/m-K	97.2 BTU-in/hr-ft²-°F
Melting Point	915 - 925 °C	1680 - 1700 °F
Boiling Point	3464 °C	6267 °F
Heat of Formation	0.000 kJ/mol	0.000 kJ/mol	Crystal
	431 kJ/mol	431 kJ/mol	Gas

Optical Properties	Metric	English	Comments
Emissivity (0-1)	0.409 @Wavelength >=645 nm, Temperature 867 - 918 °C	0.409 @Wavelength >=645 nm, Temperature 1590 - 1680 °F

Component Elements Properties	Metric	English	Comments
Lanthanum, La	100 %	100 %

Descriptive Properties
CAS Number	7439-91-0
Solubility	Soluble in diluted Acid

References for this datasheet.

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