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Accelerating Nature: Induced Atomic Order in Equiatomic FeNi
Laura H Lewis1, Plamen S Stamenov2
1Department of Chemical Engineering and Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 10, 2023
Summary
Researchers produced atomically ordered iron-nickel (FeNi), or tetrataenite, in bulk samples. Further processing could enhance its properties for advanced permanent magnets, crucial for green energy solutions.
Area of Science:
- Materials Science
- Solid State Physics
- Mineralogy
Background:
- Atomically ordered FeNi, known as tetrataenite, is a naturally occurring mineral found in meteorites.
- Understanding its formation and properties is key to developing advanced magnetic materials.
Purpose of the Study:
- To confirm the production of atomically ordered FeNi (tetrataenite) in bulk samples.
- To quantify the amount of tetrataenite formed under specific processing conditions.
- To compare the atomic order of processed FeNi with natural tetrataenite.
Main Methods:
- Simultaneous conversion X-ray and backscattered γ-ray 57 Fe Mössbauer spectroscopy.
- Thermal treatment of FeNi alloys under simultaneous magnetic and stress fields for 6 weeks.
- Analysis of precursor and processed alloy samples.
Main Results:
- Up to 22% tetragonal tetrataenite was quantified in processed FeNi samples; the remainder was cubic FeNi alloy.
- Processed FeNi showed a lower degree of atomic order compared to meteoritic tetrataenite.
- Meteoritic tetrataenite exhibited low uniaxial magnetocrystalline anisotropy energy (≈1 kJ·m-3).
Conclusions:
- Targeted refinements in FeNi processing can enhance atomic order and magnetocrystalline anisotropy.
- Improved FeNi could lead to enhanced magnetic energy products for permanent magnets.
- Tetrataenite shows potential for advanced permanent magnet applications, supporting green energy initiatives.
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