Manganese, Mn

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Manganese, Mn
Categories:	Metal; Nonferrous Metal; Pure Element
Material Notes:	Hard Gray Metal. It is almost never used unalloyed, but it is a very important alloying component in a wide variety of steel and other alloys.
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Physical Properties	Metric	English	Comments

Density	7.44 g/cc	0.269 lb/in³

Chemical Properties	Metric	English	Comments
Atomic Mass	54.93805	54.93805	54.938049 - 1995
Atomic Number	25	25
Thermal Neutron Cross Section	12.6 barns/atom	12.6 barns/atom
X-ray Absorption Edge	1.896 Å	1.896 Å	K
	16.268 Å	16.268 Å	L_I
	18.896 Å	18.896 Å	L_II
	19.2484 Å	19.2484 Å	L_III
Electrode Potential	-1.05 V	-1.05 V
Electronegativity	1.55	1.55	Pauling
Ionic Radius	0.460 Å	0.460 Å	Crystal Ionic Radius for Valence +7
	0.600 Å	0.600 Å	Crystal Ionic Radius for Valence +4
	0.660 Å	0.660 Å	Crystal Ionic Radius for Valence +3
	0.800 Å	0.800 Å	Crystal Ionic Radius for Valence +2
Electrochemical Equivalent	0.684 g/A/h	0.684 g/A/h	trivalent
	1.025 g/A/h	1.025 g/A/h	divalent

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	460	460	Converted from Vickers for 3000 kg load/10 mm ball Brinell test.
Hardness, Rockwell A	75	75	Converted from Vickers.
Hardness, Rockwell C	48	48	Converted from Vickers.
Hardness, Vickers	500	500
Tensile Strength, Ultimate	496 MPa	71900 psi	Gamma Phase
Tensile Strength, Yield	241 MPa	35000 psi	Gamma Phase
Modulus of Elasticity	159 GPa	23100 ksi
Bulk Modulus	92.6 GPa	13400 ksi
Poissons Ratio	0.35	0.35
Shear Modulus	76.4 GPa	11100 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.00000688 ohm-cm @Temperature -273 °C	0.00000688 ohm-cm @Temperature -459 °F
	0.00001884 ohm-cm @Temperature -263 °C	0.00001884 ohm-cm @Temperature -441 °F
	0.0000536 ohm-cm @Temperature -253 °C	0.0000536 ohm-cm @Temperature -423 °F
	0.0001261 ohm-cm @Temperature -223 °C	0.0001261 ohm-cm @Temperature -369 °F
	0.0001321 ohm-cm @Temperature -173 °C	0.0001321 ohm-cm @Temperature -279 °F
	0.0001359 ohm-cm @Temperature -123 °C	0.0001359 ohm-cm @Temperature -189 °F
	0.0001391 ohm-cm @Temperature -73.0 °C	0.0001391 ohm-cm @Temperature -99.4 °F
	0.0001419 ohm-cm @Temperature -23.0 °C	0.0001419 ohm-cm @Temperature -9.40 °F
	0.000143 ohm-cm @Temperature 0.000 °C	0.000143 ohm-cm @Temperature 32.0 °F
	0.000144 ohm-cm @Temperature 20.0 °C	0.000144 ohm-cm @Temperature 68.0 °F
	0.0001442 ohm-cm @Temperature 27.0 °C	0.0001442 ohm-cm @Temperature 80.6 °F
	0.0001461 ohm-cm @Temperature 77.0 °C	0.0001461 ohm-cm @Temperature 171 °F
	0.0001477 ohm-cm @Temperature 127 °C	0.0001477 ohm-cm @Temperature 261 °F
	0.0001501 ohm-cm @Temperature 227 °C	0.0001501 ohm-cm @Temperature 441 °F
	0.0001521 ohm-cm @Temperature 327 °C	0.0001521 ohm-cm @Temperature 621 °F
	0.0001536 ohm-cm @Temperature 427 °C	0.0001536 ohm-cm @Temperature 801 °F
Magnetic Susceptibility	0.0000115	0.0000115	cgs/g

Thermal Properties	Metric	English	Comments
Heat of Fusion	271 J/g	117 BTU/lb
Heat of Vaporization	4091 J/g	1760 BTU/lb
CTE, linear	22.8 µm/m-°C @Temperature 20.0 - 100 °C	12.7 µin/in-°F @Temperature 68.0 - 212 °F
	26.9 µm/m-°C @Temperature 227 °C	14.9 µin/in-°F @Temperature 441 °F
	45.7 µm/m-°C @Temperature 1087 °C	25.4 µin/in-°F @Temperature 1989 °F	Beta Phase
Specific Heat Capacity	0.379 J/g-°C	0.0906 BTU/lb-°F	Gas
	0.448 J/g-°C	0.107 BTU/lb-°F
Thermal Conductivity	1.64 W/m-K @Temperature -263 °C	11.4 BTU-in/hr-ft²-°F @Temperature -441 °F
	2.42 W/m-K @Temperature -253 °C	16.8 BTU-in/hr-ft²-°F @Temperature -423 °F
	4.07 W/m-K @Temperature -223 °C	28.2 BTU-in/hr-ft²-°F @Temperature -369 °F
	5.81 W/m-K @Temperature -173 °C	40.3 BTU-in/hr-ft²-°F @Temperature -279 °F
	6.65 W/m-K @Temperature -123 °C	46.2 BTU-in/hr-ft²-°F @Temperature -189 °F
	7.18 W/m-K @Temperature -73.0 °C	49.8 BTU-in/hr-ft²-°F @Temperature -99.4 °F
	7.54 W/m-K @Temperature -23.0 °C	52.3 BTU-in/hr-ft²-°F @Temperature -9.40 °F
	7.68 W/m-K @Temperature 0.000 °C	53.3 BTU-in/hr-ft²-°F @Temperature 32.0 °F
	7.79 W/m-K @Temperature 20.0 °C	54.1 BTU-in/hr-ft²-°F @Temperature 68.0 °F
	7.82 W/m-K @Temperature 27.0 °C	54.3 BTU-in/hr-ft²-°F @Temperature 80.6 °F
Melting Point	1244 °C	2271 °F
Boiling Point	2061 °C	3742 °F
Heat of Formation	0.000 kJ/mol	0.000 kJ/mol	Crystal
	280.7 kJ/mol	280.7 kJ/mol	Gas

Optical Properties	Metric	English	Comments
Emissivity (0-1)	0.57	0.57	unoxidized, 650 nm, total spectrum
Reflection Coefficient, Visible (0-1)	0.45	0.45	400 nm air-exposed
	0.55	0.55	400 nm polished

Component Elements Properties	Metric	English	Comments
Manganese, Mn	100 %	100 %

Descriptive Properties
CAS Number	7439-96-5
Solubility	Soluble in diluted Acids

References for this datasheet.

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