Above: Shiny Chromium metal

Iron oxide equation

  1. bDepartment of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154;
  2. cGeoSoilEnviroCARS, Center for Advanced Radiation Sources, University of Chicago, Argonne, IL 60439;
  3. dHigh Pressure Collaborative Access Team, Carnegie Institution of Washington, Argonne, IL 60439;
  4. eGeosciences, University of Arizona, Tucson, AZ ; and
  5. fDepartment of Chemistry, University of Nevada, Las Vegas, NV 89154
  1. Edited by Alexandra Navrotsky, University of California, Davis, CA, and approved August 29, 2011 (received for review May 13, 2011)


Phases of the iron–oxygen binary system are significant to most scientific disciplines, directly affecting planetary evolution, life, and technology. Iron oxides have unique electronic properties and strongly interact with the environment, particularly through redox reactions. The iron–oxygen phase diagram therefore has been among the most thoroughly investigated, yet it still holds striking findings. Here, we report the discovery of an iron oxide with formula Fe4O5, synthesized at high pressure and temperature. The previously undescribed phase, stable from 5 to at least 30 GPa, is recoverable to ambient conditions. First-principles calculations confirm that the iron oxide here described is energetically more stable than FeO + Fe3O4 at pressure greater than 10 GPa. The calculated lattice constants, equation of states, and atomic coordinates are in excellent agreement with experimental data, confirming the synthesis of Fe4O5. Given the conditions of stability and its composition, Fe4O5 is a plausible accessory mineral of the Earth’s upper mantle. The phase has strong ferrimagnetic character comparable to magnetite. The ability to synthesize the material at accessible conditions and recover it at ambient conditions, along with its physical properties, suggests a potential interest in Fe4O5 for technological applications.


  • Author contributions: B.L. designed research; B.L. and E.K. performed research; B.L. and P.D. analyzed data; and B.L., P.D., E.K., Y.M., R.T.D., P.F.W., S.R.S., and Y.Z. wrote the paper.
  • The authors declare no conflict of interest.
  • This article is a PNAS Direct Submission.
Read electro-mechanical engineering blog
You might also like
diymolds.com - Iron Oxide concrete Casting Latex Mold
diymolds.com - Iron Oxide concrete Casting Latex Mold ...
Micaceous Iron Oxide for Drawing or Painting
Micaceous Iron Oxide for Drawing or Painting
How to Decorate bisque pottery with red iron oxide
How to Decorate bisque pottery with red iron oxide
DFT Calculations on Dimethylarsinic Acid and Iron Oxide Clusters: What Density Functional Theory can tell us about the environmental remediation of a harmful herbicide
Book (LAP LAMBERT Academic Publishing)
Sundisc 12009 Type 29 Standard Density Abrasive Super Flap Disc, X Weight Poly/Cotton Backing, Aluminum Oxide, 4-1/2" Diameter, 120 Grit, 7/8" Arbor (Pack of 5)
BISS (Sundisc)
  • Sundisc super flap abrasive disc
  • Ideal for lighter stock removal and finishing
  • Ideally suited for cast iron and mild steels
  • 120 Grit size
  • Type 29 standard density
SunIfSnow SunIfSnow Sweet Candy Color Ruili Wind Alloy Resin Rhinestone Necklace Dark Purple
Jewelry (SunIfSnow)
  • Usually takes 7-15 workdays to US
  • Imported
  • Occasion applicable:Travel, wedding, employee benefits, birthday
  • Alloy
Octagonal Pattern Japanese Style Cast Iron Teapot Kettle Tetsubin with Copper Lid 1100ml
  • Wisdom China Cast Iron Teapot
  • Pattern: Octagonal pattern
  • *No enamel or glazing over the inside surface.
  • After molding, fire the interior with 800-1 degree charcoal fire. To form a layer of high density oxide membrane. This oxide membrane has the effect of anti-oxidation...
  • Capacity: about 1.1L
Related Posts