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Title: Isotropic nanocrystalline Sm(Fe,Co)11.3Ti0.7 magnets modified with B and Zr

Abstract

Rare-earth-lean Sm(Fe,Co,Ti)12 alloys with the ThMn12 crystal structure and less than one Ti atom per formula unit have the potential of exceptionally powerful permanent magnets, but all prior attempts to develop high coercivity in bulk alloys, especially coercivity combined with crystallographic texture, have fallen short of the expectations. This study was aimed at improvement of the currently best Sm(Fe,Co,Ti)12 magnets prepared through melt-spinning which are inherently isotropic. Modifications of the alloys with B and Zr, already demonstrated in earlier studies to be effective separately, have been implemented simultaneously. Here, a systematic study of Sm1.1-x(Fe,Co)11.3-yTi0.7By alloys melt-spun at a tangential speed of 50 m/s and annealed at 600–950 °C allowed for monitoring the continuous evolution of the two consecutive crystal structures, those of the TbCu7 and ThMn12 types. Zirconium was found to facilitate the formation of the 1:12 structure at the expense of the 1:7, whereas boron has the opposite effect, at certain concentrations completely suppressing the 1:12. When the two alloying elements are introduced simultaneously, they inhibit growth of the 1:12 crystallites at annealing temperatures higher than 800 °C, thus allowing for the development of a higher coercivity. Because of instrumental limitations, bulk magnets were prepared through a two-step processmore » – compaction of the melt-spun ribbons at 650 °C and additional treatment at a higher temperature – and they were characterized by a reduced, 90–93%, density. Nevertheless, an isotropic Sm0.9Zr0.2(Fe,Co)10.8Ti0.7B0.5 magnet exhibited fair values of the remanence (7.4 kG), maximum energy product (8.5 MGOe) and coercivity (5.4 kOe), as well as high Curie temperature of 525 °C and remarkably small temperature coefficient of the coercivity, -0.25%/°C.« less

Authors:
ORCiD logo [1];  [1]
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  1. Univ. of Delaware, Newark, DE (United States)
Publication Date:
Research Org.:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1768192
Alternate Identifier(s):
OSTI ID: 1862582
Grant/Contract Number:  
FG02-90ER45413
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Magnetism and Magnetic Materials
Additional Journal Information:
Journal Volume: 529; Journal ID: ISSN 0304-8853
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; permanent magnets; ThMn12 structure; nanostructured materials; melt-spinning; hot compaction

Citation Formats

Gabay, Alexander M., and Hadjipanayis, George C. Isotropic nanocrystalline Sm(Fe,Co)11.3Ti0.7 magnets modified with B and Zr. United States: N. p., 2021. Web. doi:10.1016/j.jmmm.2021.167867.
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Gabay, Alexander M., & Hadjipanayis, George C. Isotropic nanocrystalline Sm(Fe,Co)11.3Ti0.7 magnets modified with B and Zr. United States. https://doi.org/10.1016/j.jmmm.2021.167867
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Gabay, Alexander M., and Hadjipanayis, George C. Tue . "Isotropic nanocrystalline Sm(Fe,Co)11.3Ti0.7 magnets modified with B and Zr". United States. https://doi.org/10.1016/j.jmmm.2021.167867. https://www.osti.gov/servlets/purl/1768192.
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@article{osti_1768192,
title = {Isotropic nanocrystalline Sm(Fe,Co)11.3Ti0.7 magnets modified with B and Zr},
author = {Gabay, Alexander M. and Hadjipanayis, George C.},
abstractNote = {Rare-earth-lean Sm(Fe,Co,Ti)12 alloys with the ThMn12 crystal structure and less than one Ti atom per formula unit have the potential of exceptionally powerful permanent magnets, but all prior attempts to develop high coercivity in bulk alloys, especially coercivity combined with crystallographic texture, have fallen short of the expectations. This study was aimed at improvement of the currently best Sm(Fe,Co,Ti)12 magnets prepared through melt-spinning which are inherently isotropic. Modifications of the alloys with B and Zr, already demonstrated in earlier studies to be effective separately, have been implemented simultaneously. Here, a systematic study of Sm1.1-x(Fe,Co)11.3-yTi0.7By alloys melt-spun at a tangential speed of 50 m/s and annealed at 600–950 °C allowed for monitoring the continuous evolution of the two consecutive crystal structures, those of the TbCu7 and ThMn12 types. Zirconium was found to facilitate the formation of the 1:12 structure at the expense of the 1:7, whereas boron has the opposite effect, at certain concentrations completely suppressing the 1:12. When the two alloying elements are introduced simultaneously, they inhibit growth of the 1:12 crystallites at annealing temperatures higher than 800 °C, thus allowing for the development of a higher coercivity. Because of instrumental limitations, bulk magnets were prepared through a two-step process – compaction of the melt-spun ribbons at 650 °C and additional treatment at a higher temperature – and they were characterized by a reduced, 90–93%, density. Nevertheless, an isotropic Sm0.9Zr0.2(Fe,Co)10.8Ti0.7B0.5 magnet exhibited fair values of the remanence (7.4 kG), maximum energy product (8.5 MGOe) and coercivity (5.4 kOe), as well as high Curie temperature of 525 °C and remarkably small temperature coefficient of the coercivity, -0.25%/°C.},
doi = {10.1016/j.jmmm.2021.167867},
journal = {Journal of Magnetism and Magnetic Materials},
number = ,
volume = 529,
place = {United States},
year = {Tue Mar 02 00:00:00 EST 2021},
month = {Tue Mar 02 00:00:00 EST 2021}
}
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Works referenced in this record:

Magnetic properties of melt-spun ribbons (Sm1–Zr )(Fe0.92Ti0.08)10 with ThMn12 structure and their hydrides
journal, October 2019

Preparation of High-Coercivity Magnetic Powder via Heat Treatment of a Rapidly Quenched Amorphous Starting Compound with a ThMn12 Structure
journal, January 2020

Structure and magnetic properties of nanocrystalline Sm ( Fe 1 − x Co x ) 11 Ti ( x <~ 2 )
journal, January 2001

Structural and magnetic properties of rapidly quenched (Sm,R)(Fe,Co) 11.4 Ti 0.6 (R = Y, Zr) with ThMn 12 structure
journal, March 2019

  • Hagiwara, Masaya; Sanada, Naoyuki; Sakurada, Shinya
  • AIP Advances, Vol. 9, Issue 3
  • DOI: 10.1063/1.5079949

Rapid solidification of Nd1+XFe11Ti compounds: Phase formation and magnetic properties
journal, November 2019

Structure and magnetic properties of (Sm0.9Zr0.1)Fe11Ti alloys with ThMn12-type structure
journal, August 2019

  • Neznakhin, D. S.; Andreev, S. V.; Semkin, M. A.
  • Journal of Magnetism and Magnetic Materials, Vol. 484
  • DOI: 10.1016/j.jmmm.2019.04.030

Crystallized melt spun Sm(Fe10−xCox)11Ti alloys with (BH)max products larger than 90 kJ m−3 (11.3 MGOe)
journal, July 1990

Structural and magnetic properties of rapidly quenched (Sm,Zr)(Fe,Co) 11 B X (x = 0–1) ribbons
journal, April 2011

  • Horiuchi, Yosuke; Sakurada, Shinya
  • Journal of Applied Physics, Vol. 109, Issue 7
  • DOI: 10.1063/1.3562914

Anisotropic, single-crystalline SmFe12-based microparticles with high roundness fabricated by jet-milling
journal, October 2019

Pr‐Fe and Nd‐Fe‐based materials: A new class of high‐performance permanent magnets (invited)
journal, March 1984

  • Croat, J. J.; Herbst, J. F.; Lee, R. W.
  • Journal of Applied Physics, Vol. 55, Issue 6
  • DOI: 10.1063/1.333571

High coercivity in rapidly quenched Sm(Fe, T ) 1 2 ‐type magnets
journal, May 1989

  • Singleton, E. W.; Strzeszewski, J.; Hadjipanayis, G. C.
  • Applied Physics Letters, Vol. 54, Issue 19
  • DOI: 10.1063/1.101501

Coercivity and microstructure of melt‐spun Sm(Fe 1 1 Ti)
journal, May 1990

  • Sun, Hong; Otani, Yoshichika; Coey, J. M. D.
  • Journal of Applied Physics, Vol. 67, Issue 9
  • DOI: 10.1063/1.344845

Magnetic hardening of Sm‐Fe‐Ti alloys
journal, May 1990

  • Wecker, J.; Katter, M.; Schnitzke, K.
  • Journal of Applied Physics, Vol. 67, Issue 9
  • DOI: 10.1063/1.344744

Phase relations in the system Sm-Fe-Ti and the consequences for the production of permanent magnets
journal, September 1992

  • Reinsch, B.; Grieb, B.; Henig, E. -T.
  • IEEE Transactions on Magnetics, Vol. 28, Issue 5
  • DOI: 10.1109/20.179642

Magnetic properties of SmFeTiV alloys
journal, July 1990

Magnetic and structural studies in Sm‐Fe‐Ti magnets
journal, May 1990

  • Wang, Y.; Hadjipanayis, G. C.; Kim, A.
  • Journal of Applied Physics, Vol. 67, Issue 9
  • DOI: 10.1063/1.344745

Method for Determining Crystal Grain Size by X-Ray Diffraction
journal, January 2018

  • He, Kai; Chen, Nuofu; Wang, Congjie
  • Crystal Research and Technology, Vol. 53, Issue 2
  • DOI: 10.1002/crat.201700157

Phase transformation and magnetic properties of fully dense Sm(Fe0.8Co0.2)11Ti bulk magnets
journal, March 2021

Magnetic properties of SmFe12-based magnets produced by spark plasma sintering method
journal, January 2019

Enhancement of Magnetic Properties of Sm(Fe, Co, Ti)<SUB>12</SUB> Melt-Spun Ribbons by Refining Crystallized Grains
journal, January 1991

The stability of newly developed (R,Zr)(Fe,Co)12−xTix alloys for permanent magnets
journal, February 2017

Composition and crystal structure of hexagonal Cu-rich rare earth–copper compounds
journal, June 1971

  • Buschow, K. H. J.; van der Goot, A. S.
  • Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, Vol. 27, Issue 6
  • DOI: 10.1107/S0567740871003558

Magnetic properties and structure change from tetragonal to hexagonal for the rapidly quenched SmTiFe 1 1 alloy ribbons
journal, November 1988

  • Saito, H.; Takahashi, M.; Wakiyama, T.
  • Journal of Applied Physics, Vol. 64, Issue 10
  • DOI: 10.1063/1.342164

Structural and hard magnetic properties of rapidly solidified Sm–Fe–N
journal, September 1991

  • Katter, M.; Wecker, J.; Schultz, L.
  • Journal of Applied Physics, Vol. 70, Issue 6
  • DOI: 10.1063/1.349302

Large coercivities i melt-spun SmFeTi type magnets
journal, July 1990

Achievement of high coercivity in Sm(Fe0.8Co0.2)12 anisotropic magnetic thin film by boron doping
journal, August 2020

Structural and magnetic properties of Ce 1 − x Sm x Fe 11 − y Ti 1 V y
journal, June 2019

Phase equilibria around SmFe11 Ti at 1000 °C
journal, June 1991

Structure and magnetic properties of rapidly quenched SmFeTi alloys
journal, February 1995

Microstructure of solid-HDDR NdFeB:Zr magnets
journal, May 1996

High-coercivity Sm(Fe,V,Ti)12 bulk magnets
journal, January 2021

(Sm,Zr)(Fe,Co) 11.0-11.5 Ti 1.0-0.5 compounds as new permanent magnet materials
journal, February 2016

  • Kuno, Tomoko; Suzuki, Shunji; Urushibata, Kimiko
  • AIP Advances, Vol. 6, Issue 2
  • DOI: 10.1063/1.4943051

Structure and magnetic properties of R(FeVB)12 compounds
journal, April 1995

The Sm-Fe-V based 1:12 bulk magnets
journal, June 2019

The effect of Zr substitution on saturation magnetization in (Sm1-xZrx)(Fe0.8Co0.2)12 compound with the ThMn12 structure
journal, October 2019

Nanocrystalline Sm-based 1:12 magnets
journal, November 2020

Enhancing Energy Product and Thermal Stability of Sm Fe 12 by Interstitial Doping
journal, May 2020

POWDER CELL – a program for the representation and manipulation of crystal structures and calculation of the resulting X-ray powder patterns
journal, June 1996

Relationship between ThMn 12 and Th 2 Ni 17 structure types in the YFe 11− x Ti x alloy series
journal, May 1990

  • Hu, Bo‐Ping; Li, Hong‐Shuo; Coey, J. M. D.
  • Journal of Applied Physics, Vol. 67, Issue 9
  • DOI: 10.1063/1.344753

Effect of R-site substitution and the pressure on stability of R Fe 12: A first-principles study
journal, October 2018

  • Harashima, Yosuke; Fukazawa, Taro; Kino, Hiori
  • Journal of Applied Physics, Vol. 124, Issue 16
  • DOI: 10.1063/1.5050057

Effect of boron additions on phase formation and magnetic properties of TbCu7-type melt spun SmFe ribbons
journal, August 2016

Intrinsic hard magnetic properties of Sm(Fe 1−x Co x ) 12 compound with the ThMn 12 structure
journal, September 2017

Demagnetizing factors for rectangular ferromagnetic prisms
journal, March 1998

  • Aharoni, Amikam
  • Journal of Applied Physics, Vol. 83, Issue 6
  • DOI: 10.1063/1.367113
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