Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

Title: Assessment of minnealloy fabrication via three routes

Journal Article · · AIP Advances
DOI: https://doi.org/10.1063/9.0000910 · OSTI ID:2527387
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of Minnesota, Minneapolis, MN (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
+ Show Author Affiliations

Transformer cores exhibiting higher operating power and improved efficiency are of great interest to electrical utilities, industry, and the de-carbonization effort. Minnealloy, α"-Fe16(C,N)2, a martensite made only of iron, nitrogen, and carbon, has shown the largest saturation magnetization of any soft ferromagnet, 250 emu/g, and tunable magnetocrystalline anisotropy. Given this represents a significant increase in power transferred per cycle compared to legacy transformer core materials, we investigate three novel, industrially scalable routes for fabricating Minnealloy. The martensite phase content is investigated for each route. Vibrating sample magnetometry is used to investigate the change in saturation magnetization and coercivity with respect to the relative content of the desired phase and other iron, iron-nitride, and iron oxide phase impurities. The relationship between structure and magnetic properties of bulk α"-Fe16(C,N)2 is investigated using LDA, PBE, and PBEsol exchange-correlation functionals within the frameworks of Hubbard-corrected density functional theory (DFT+U).

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003525
OSTI ID:
2527387
Report Number(s):
SAND--2025-03696J
Journal Information:
AIP Advances, Journal Name: AIP Advances Journal Issue: 3 Vol. 15; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (14)

Structural, chemical and magnetic characterization of iron nitride thin films journal January 2006
The saturation magnetization of FeN films prepared by nitriding treatment in N2 plasma journal May 1995
Modern soft magnets: Amorphous and nanocrystalline materials journal February 2013
The structure and magnetic properties of Fe3N as a photocatalyst applied in hydrogen generation induced by visible light journal January 2015
High saturation magnetization and low magnetic anisotropy Fe-CN martensite thin film journal April 2019
Minnealloy: a new magnetic material with high saturation flux density and low magnetic anisotropy journal August 2017
Magnetic structure of Fe 16 N 2 determined by polarized neutron diffraction on thin-film samples journal September 2020
Self-interaction correction to density-functional approximations for many-electron systems journal May 1981
Atoms, molecules, solids, and surfaces: Applications of the generalized gradient approximation for exchange and correlation journal September 1992
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
Polarized-neutron-diffraction study of the microscopic magnetic structure in α ′ ′ − Fe 16 N 2 nanoparticles journal October 2014
Restoring the Density-Gradient Expansion for Exchange in Solids and Surfaces journal April 2008
Generalized Gradient Approximation Made Simple journal October 1996
Design of an Experimental Approach for Characterization and Performance Analysis of High-Frequency Transformer Core Materials journal May 2023

Similar Records

Related Subjects

36 MATERIALS SCIENCE