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Accelerating Nature: Induced Atomic Order in Equiatomic FeNi

Journal Article · · Advanced Science
 [1];  [2]
  1. Department of Chemical Engineering and Department of Mechanical and Industrial Engineering Northeastern University Boston MA 02115 USA
  2. School of Physics &, CRANN Trinity College Dublin 2 Ireland
Abstract

The production of locally atomically ordered FeNi (known by its meteoric mineral name, tetrataenite) is confirmed in bulk samples by simultaneous conversion X‐ray and backscattered γ‐ray 57 Fe Mössbauer spectroscopy. Up to 22 volume percent of the tetragonal tetrataenite phase is quantified in samples thermally treated under simultaneous magnetic‐ and stress‐field conditions for a period of 6 weeks, with the remainder identified as the cubic FeNi alloy. In contrast, all precursor samples consist only of the cubic FeNi alloy. Data from the processed alloys are validated using Mössbauer parameters derived from natural meteoritic tetrataenite. The meteoritic tetrataenite exhibits a substantially higher degree of atomic order than do the processed samples, consistent with their low uniaxial magnetocrystalline anisotropy energy of ≈1 kJ·m −3 . These results suggest that targeted refinements to the processing conditions of FeNi will foster greater atomic order and increased magnetocrystalline anisotropy, leading to an enhanced magnetic energy product. These outcomes also suggest that deductions concerning paleomagnetic conditions of the solar system, as derived from meteoritic data, may warrant re‐examination and re‐evaluation. Additionally, this work strengthens the argument that tetrataenite may indeed become a member of the advanced permanent magnet portfolio, helping to meet rapidly escalating green energy imperatives.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0022168
OSTI ID:
2229471
Alternate ID(s):
OSTI ID: 2403502
OSTI ID: 2242537
OSTI ID: 2283674
Journal Information:
Advanced Science, Journal Name: Advanced Science Journal Issue: 7 Vol. 11; ISSN 2198-3844
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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