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Title: High Pressure Synthesis of New Magnets, Featuring Diamagnetic Sources of Anisotropy

Abstract

Permanent magnets are the functional component of electric motors and generators found in numerous renewable energy applications spanning from regenerative brakes to wind turbines. Magnets that generate higher magnetic flux per volume are central to improved energy generation in these applications. To develop a new class of permanent magnets while retaining the properties conferred by rare-earth elements, a fundamentally different approach is required. We hypothesize that by engendering a covalent interaction between two elements, it will be possible to interact the two components of a magnetic moment—spin and orbital angular momentum—from two separate atoms to form a complete magnetic moment. This seed project focuses on the scale up of the compound FeBi2, which was initially synthesized in our laboratory. Scale up approaches include slow decompression, alternate synthetic routes, and using fabrication approaches to more intimately mix the precursor elements. We also pursued the synthesis of new phases in the Mn-Bi system targeted to create new magnetic materials. In our initial experiments we decompressed FeBi2 down to 2.9 GPa, demonstrating a kinetic stability to the phase that enabled it to be recovered to an order of magnitude lower pressure than that needed to synthesize it (30 GPa). Our goal is tomore » recover this exciting material to ambient pressures so that we can isolate samples for detailed physical properties measurements. We have undertaken three distinct approaches toward that goal, which we summarize below. Our two most notable results are the formation of a quenchable phase through antimony doping of FeBi2, and the development of a new approach to preparing samples for diamond anvil cell syntheses.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Northwestern University
Publication Date:
Research Org.:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Contributing Org.:
Northwestern University, Department of Energy through National Laboratory facilities
OSTI Identifier:
1545547
Report Number(s):
DOE-NORTHWESTERN-18092
DOE Contract Number:  
SC0018092
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; magnets, magnetism, permanent magnets, bismuth, materials science, solid-state chemistry, synthesis, inorganic chemistry, high-pressure, kinetic phases

Citation Formats

Freedman, Danna Erit, Walsh, James Paul Slater, Altman, Alison, and Tamerius, Alexandra. High Pressure Synthesis of New Magnets, Featuring Diamagnetic Sources of Anisotropy. United States: N. p., 2019. Web. doi:10.2172/1545547.
Freedman, Danna Erit, Walsh, James Paul Slater, Altman, Alison, & Tamerius, Alexandra. High Pressure Synthesis of New Magnets, Featuring Diamagnetic Sources of Anisotropy. United States. doi:10.2172/1545547.
Freedman, Danna Erit, Walsh, James Paul Slater, Altman, Alison, and Tamerius, Alexandra. Tue . "High Pressure Synthesis of New Magnets, Featuring Diamagnetic Sources of Anisotropy". United States. doi:10.2172/1545547. https://www.osti.gov/servlets/purl/1545547.
@article{osti_1545547,
title = {High Pressure Synthesis of New Magnets, Featuring Diamagnetic Sources of Anisotropy},
author = {Freedman, Danna Erit and Walsh, James Paul Slater and Altman, Alison and Tamerius, Alexandra},
abstractNote = {Permanent magnets are the functional component of electric motors and generators found in numerous renewable energy applications spanning from regenerative brakes to wind turbines. Magnets that generate higher magnetic flux per volume are central to improved energy generation in these applications. To develop a new class of permanent magnets while retaining the properties conferred by rare-earth elements, a fundamentally different approach is required. We hypothesize that by engendering a covalent interaction between two elements, it will be possible to interact the two components of a magnetic moment—spin and orbital angular momentum—from two separate atoms to form a complete magnetic moment. This seed project focuses on the scale up of the compound FeBi2, which was initially synthesized in our laboratory. Scale up approaches include slow decompression, alternate synthetic routes, and using fabrication approaches to more intimately mix the precursor elements. We also pursued the synthesis of new phases in the Mn-Bi system targeted to create new magnetic materials. In our initial experiments we decompressed FeBi2 down to 2.9 GPa, demonstrating a kinetic stability to the phase that enabled it to be recovered to an order of magnitude lower pressure than that needed to synthesize it (30 GPa). Our goal is to recover this exciting material to ambient pressures so that we can isolate samples for detailed physical properties measurements. We have undertaken three distinct approaches toward that goal, which we summarize below. Our two most notable results are the formation of a quenchable phase through antimony doping of FeBi2, and the development of a new approach to preparing samples for diamond anvil cell syntheses.},
doi = {10.2172/1545547},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}