Iron (II, III) Oxide, Fe 3 O 4 (Magnetite)

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Iron (II, III) Oxide, Fe₃O₄ (Magnetite)
Categories:	Ceramic; Oxide
Material Notes:	Black cubic crystals or amorphous powder. Weathering end product(s): Limonite, ochre. Occurrence: Igneous rocks, metamorphic. Weathers very slowly to limonite. Property values are typical of naturally occurring Magnetite (Fe₃O₄). Actual property values will vary from sample to sample.
Key Words:	Fe3O4, Iron Oxide
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Physical Properties	Metric	English	Comments

Density	5.17 g/cc	0.187 lb/in³
a Lattice Constant	8.394 Å	8.394 Å
Formula Units/Cell (Z)	8	8
Molecular Weight	231.533 g/mol	231.533 g/mol

Mechanical Properties	Metric	English	Comments
Hardness, Mohs	5.5	5.5
	6.0	6.0

Thermal Properties	Metric	English	Comments
Heat of Fusion	596 J/g	256 BTU/lb
CTE, linear	9.20 µm/m-°C @Temperature 20.0 - 200 °C	5.11 µin/in-°F @Temperature 68.0 - 392 °F	calculated from volumetric expansion
	13.1 µm/m-°C @Temperature 20.0 - 500 °C	7.28 µin/in-°F @Temperature 68.0 - 932 °F	calculated from volumetric expansion
Melting Point	1597 °C	2907 °F

Optical Properties	Metric	English	Comments
Refractive Index	2.42 @Wavelength 589.3 nm	2.42 @Wavelength 589.3 nm	η, Na

Descriptive Properties
CAS Number	1317-61-9
Color	Black
Crystal Structure	Cubic		Spinel

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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