High-coercivity ThMn12-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion

Gabay, Alexander M.; Hadjipanayis, George C.

doi:10.1016/j.scriptamat.2021.113760

Title: High-coercivity ThMn₁₂-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion

Abstract

The ThMn₁₂-type (Sm,Zr)1(Fe,Co,Ti)₁₂ compounds have the potential of powerful permanent magnets. Magnetically hard and anisotropic powders of such compound have been prepared by subjecting elemental oxides and Co mixed with Ca and CaO dispersant to a succession of high-energy ball-milling, reduction diffusion at 990–1220 °C and repeated washing. The size of the resulting ThMn₁₂-type crystallites, their coercivity and fraction of monocrystalline particles were all found to increase with the reduction-diffusion temperature. Particles synthesized at 1220 °C were highly monocrystalline with a mean size of 0.54 μm and, after a magnetic-field alignment, exhibited a coercivity of 1.26 T and a full-density-projected maximum energy product of at least 209 kJ/m³ (26.3 MGOe). Here, the strong positive effect of the reduction-diffusion temperature on the coercivity has been attributed to separation of the crystallites and to decrease in the incidence of structural defects.

Authors:

Gabay, Alexander M. ^[1]; Hadjipanayis, George C. ^[1]

Univ. of Delaware, Newark, DE (United States)

Publication Date:: Thu Feb 04 00:00:00 EST 2021

Research Org.:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1762003

Alternate Identifier(s):: OSTI ID: 1780061

Grant/Contract Number:: FG02-90ER45413

Resource Type:: Accepted Manuscript

Journal Name:: Scripta Materialia

Additional Journal Information:: Journal Volume: 196; Journal ID: ISSN 1359-6462

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Mechanochemical synthesis; Powder processing; Rare earth magnets; Magnetic anisotropy; Coercivity

Citation Formats


                    Gabay, Alexander M., and Hadjipanayis, George C. High-coercivity ThMn12-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion.  United States: N. p., 2021. 
Web.  doi:10.1016/j.scriptamat.2021.113760.

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                    Gabay, Alexander M., & Hadjipanayis, George C. High-coercivity ThMn12-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion.  United States.  https://doi.org/10.1016/j.scriptamat.2021.113760

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                    Gabay, Alexander M., and Hadjipanayis, George C. Thu .  
"High-coercivity ThMn12-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion".  United States.  https://doi.org/10.1016/j.scriptamat.2021.113760.  https://www.osti.gov/servlets/purl/1762003.

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@article{osti_1762003,

  title        = {High-coercivity ThMn12-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion},

  author       = {Gabay, Alexander M. and Hadjipanayis, George C.},

  abstractNote = {The ThMn12-type (Sm,Zr)1(Fe,Co,Ti)12 compounds have the potential of powerful permanent magnets. Magnetically hard and anisotropic powders of such compound have been prepared by subjecting elemental oxides and Co mixed with Ca and CaO dispersant to a succession of high-energy ball-milling, reduction diffusion at 990–1220 °C and repeated washing. The size of the resulting ThMn12-type crystallites, their coercivity and fraction of monocrystalline particles were all found to increase with the reduction-diffusion temperature. Particles synthesized at 1220 °C were highly monocrystalline with a mean size of 0.54 μm and, after a magnetic-field alignment, exhibited a coercivity of 1.26 T and a full-density-projected maximum energy product of at least 209 kJ/m3 (26.3 MGOe). Here, the strong positive effect of the reduction-diffusion temperature on the coercivity has been attributed to separation of the crystallites and to decrease in the incidence of structural defects.},

  doi          = {10.1016/j.scriptamat.2021.113760},

  journal      = {Scripta Materialia},

  number       = ,

  volume       = 196,

  place        = {United States},

  year         = {Thu Feb 04 00:00:00 EST 2021},

  month        = {Thu Feb 04 00:00:00 EST 2021}

}

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Title: High-coercivity ThMn12-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion

Abstract

Citation Formats

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

Intrinsic magnetic properties of Sm(Fe1-Co )11Ti and Zr-substituted Sm1-yZr (Fe0.8Co0.2)11.5Ti0.5 compounds with ThMn12 structure toward the development of permanent magnets journal, July 2018

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Title: High-coercivity ThMn₁₂-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion

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Intrinsic magnetic properties of Sm(Fe1-Co )11Ti and Zr-substituted Sm1-yZr (Fe0.8Co0.2)11.5Ti0.5 compounds with ThMn12 structure toward the development of permanent magnets
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Effect of Y substitution on the structural and magnetic properties of Sm(Fe0.8Co0.2)11.4Ti0.6
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