Magnetite is a hard, black, ferrimagnetic, lustrous iron oxide, Fe3O4, which occurs naturally but may also be synthesized, especially when nanoparticles are desired. It is used as specialty filler because of its unique combination of electrical, thermal, and magnetic properties as well as for its exceptionally high density.
Magnetite is a remarkable material with unusual properties and diverse applications. Probably the best-known example is magnetite iron ore used for steel production, which consumes millions of tons per year. Another lesser known use is in water purification, where very high purity magnetite is used as a feedstock to produce iron-based chemicals. It is also used as a catalyst in the production of ammonia. There are many other less well-known places where we encounter magnetite. For example, true gun bluing is a thin layer of magnetite which passivates the surface of iron to help prevent corrosion and to lend a decorative effect. Magnetite and...
KeywordsIron oxide Magnetite High density Microwaveable Specialty filler Radiation shielding
I would like to thank Roger Rothon for inviting me to write this piece and for his helpful feedback. LKAB Minerals are thanked for supporting me and in particular Luke Hollingbery for the SEM of MagniF 10 and for very valuable comments. Peter Duifhuis is thanked for contributing his deep expertise in magnetite having pioneered its use in plastics.
- Aldissi M (1993) Filter line cable featuring conductive fiber shielding. US Patent 5,262,592Google Scholar
- Chan J (2013) Thermal properties of concrete with different Swedish aggregate materials. Masters Thesis, Report TVBM-5095, University of LundGoogle Scholar
- Clauser C, Huenges E (1995) Thermal conductivity of rocks and minerals. In: Ahrens TJ (ed) Rock physics and phase relations, a handbook of physical constants. American Geophysical Union Reference, Washington, DCGoogle Scholar
- Duifhuis P, Weidenfeller B (2002) Mechanical properties at a glance: polypropylene/magnetite compounds. Kunststoffe 92(8):64–70Google Scholar
- Halliwell SM (1992) Weathering of polymers. Rapra Review Reports, Rapra Technology LtdGoogle Scholar
- Hancock Y, Finlayson TR (1995) Thermal expansion of magnetite (4.2–300 K). In: Poster session 19th annual A&NZ IP condensed matter & materials meeting, Wagga, 7/02/1995 – 10/02Google Scholar
- Hein CL, Lens J-P, Pai-Paranjape V, Peek C, van de Grampel RD (2013) X-Ray and/or metal detectable articles and method of making the same. US Patent 2013131251Google Scholar
- Huijbregts WMM, Snel A (1972) The protection effectiveness of magnetite layers in relation to boiler corrosion. In: 5th international congress on metallic corrosion, TokioGoogle Scholar
- Mangnus R (2003) Kautschuk, Gummi, Kunstoffe Online. 6: 322–329Google Scholar
- McGill SL, Walkiewicz JW, Clark AE (1995) Report of investigations 9518 – Microwave heating of chemicals and minerals. US Department of the Interior, Bureau of MinesGoogle Scholar
- Papell SS (1965) Low viscosity magnetic fluid obtained by the colloidal suspension of magnetic particles. US Patent 3215572AGoogle Scholar
- Parkinson GS, Diebold U, Tang J, Malkinski L (2012) Tailoring the interface properties of magnetite for spintronics. In: Malinsk L (ed) Advanced magnetic materials. InTech, CroatiaGoogle Scholar
- Pullaiah G, Irving E, Buchan KL, Dunlop DJ (1975) Magnetization changes caused by burial and uplift, earth planet. Sci Lett 28:133–143Google Scholar
- Robertson EC (1988) Thermal properties of rocks. USGS Open-File Report 88–441Google Scholar
- Scott G (1997) Antioxidants in science, technology, medicine and nutrition. Woodhead PublishingGoogle Scholar
- Takayama AS, Link G, Sano S, Matsubara A, Sato M, Thumm M (2007) Microwave frequency effect for reduction of magnetite. In: Proceedings of ITC/ISHWGoogle Scholar
- Vialle G (2009) Inductive activation of magnetite filled shape memory polymers. Masters Thesis, Georgia Institute of TechnologyGoogle Scholar
- Yixin H, Chunpeng L (1996) Heating rate of minerals and compounds in microwave field. Trans NF soc 6(1):35–40Google Scholar