Evolution of structural and magnetic properties in LaxCe2-xCo16 Ti for $0 \leq x \leq 2$

Conner, Benjamin S.; McGuire, Michael A.; Veedu, Shanavas Kavungal; Parker, David S.; Sales, Brian C.

doi:10.1016/j.jallcom.2016.11.078

Title: Evolution of structural and magnetic properties in La_xCe_2-xCo₁₆ Ti for $$0 \leq x \leq 2$$

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Abstract

Here we examine the intrinsic magnetic and structural properties of the title alloys, permanent magnet materials based on the abundant rare-earth elements lanthanum and cerium, since these properties (T_C, M_sH_a(K₁, K₂)) will set the upper limits on the quality of permanent magnet that can be fabricated from said alloys. Ce₂Co₁₆Ti has a high magnetic anisotropy (H_a = 65 kOe) but a relatively low saturation magnetization (M_s = 7.3 kG), and La₂Co₁₆Ti has a high Ms(9.5 kG) but Ha too low for most applications (16 kOe). Though these two end-members have previously well-known properties, changing economic conditions have made re-examination of systems containing cerium and lanthanum necessary as the economic viability of rare earth mining becomes dependent on extraction of products beyond what is currently considered useful and profitable within the rare earth elements. We find that replacing some lanthanum with cerium in La₂Co₁₆Ti increases H_a by a factor of more than two, while decreasing M_s by less than 5%. The measured Ms indicate maximum possible energy products in excess of 20 MG·Oe in these materials, which have Curie temperatures near 600 °C. Real energy products are expected to be greatest near x = 1. In conclusion, these findings identify La_xCe_2-xCo₁₆Timore »« less

Authors:

Conner, Benjamin S. ^[1]; McGuire, Michael A. ^[1]; Veedu, Shanavas Kavungal ^[1]; Parker, David S. ^[1]; Sales, Brian C. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Publication Date:: Fri Nov 11 00:00:00 EST 2016

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Critical Materials Institute (CMI)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE

OSTI Identifier:: 1337487

Alternate Identifier(s):: OSTI ID: 1397605

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Alloys and Compounds

Additional Journal Information:: Journal Volume: 695; Journal ID: ISSN 0925-8388

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Permanent magnet; Magnetic anisotropy; Critical materials; La2Co16Ti; Ce2Co16Ti; Ce2Co17; Th2Ni17; Th2Zn17

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                    Conner, Benjamin S., McGuire, Michael A., Veedu, Shanavas Kavungal, Parker, David S., and Sales, Brian C. Evolution of structural and magnetic properties in LaxCe2-xCo16 Ti for $0 \leq x \leq 2$.  United States: N. p., 2016. 
Web.  doi:10.1016/j.jallcom.2016.11.078.

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                    Conner, Benjamin S., McGuire, Michael A., Veedu, Shanavas Kavungal, Parker, David S., & Sales, Brian C. Evolution of structural and magnetic properties in LaxCe2-xCo16 Ti for $0 \leq x \leq 2$.  United States.  https://doi.org/10.1016/j.jallcom.2016.11.078

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                    Conner, Benjamin S., McGuire, Michael A., Veedu, Shanavas Kavungal, Parker, David S., and Sales, Brian C. Fri .  
"Evolution of structural and magnetic properties in LaxCe2-xCo16 Ti for $0 \leq x \leq 2$".  United States.  https://doi.org/10.1016/j.jallcom.2016.11.078.  https://www.osti.gov/servlets/purl/1337487.

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@article{osti_1337487,

  title        = {Evolution of structural and magnetic properties in LaxCe2-xCo16 Ti for $0 \leq x \leq 2$},

  author       = {Conner, Benjamin S. and McGuire, Michael A. and Veedu, Shanavas Kavungal and Parker, David S. and Sales, Brian C.},

  abstractNote = {Here we examine the intrinsic magnetic and structural properties of the title alloys, permanent magnet materials based on the abundant rare-earth elements lanthanum and cerium, since these properties (TC, MsHa(K1, K2)) will set the upper limits on the quality of permanent magnet that can be fabricated from said alloys. Ce2Co16Ti has a high magnetic anisotropy (Ha = 65 kOe) but a relatively low saturation magnetization (Ms = 7.3 kG), and La2Co16Ti has a high Ms(9.5 kG) but Ha too low for most applications (16 kOe). Though these two end-members have previously well-known properties, changing economic conditions have made re-examination of systems containing cerium and lanthanum necessary as the economic viability of rare earth mining becomes dependent on extraction of products beyond what is currently considered useful and profitable within the rare earth elements. We find that replacing some lanthanum with cerium in La2Co16Ti increases Ha by a factor of more than two, while decreasing Ms by less than 5%. The measured Ms indicate maximum possible energy products in excess of 20 MG·Oe in these materials, which have Curie temperatures near 600 °C. Real energy products are expected to be greatest near x = 1. In conclusion, these findings identify LaxCe2-xCo16Ti as a promising system for development of so-called gap magnets that fill the energy product gap between expensive rare-earth magnets and current non-rare earth alternatives.},

  doi          = {10.1016/j.jallcom.2016.11.078},

  journal      = {Journal of Alloys and Compounds},

  number       = ,

  volume       = 695,

  place        = {United States},

  year         = {Fri Nov 11 00:00:00 EST 2016},

  month        = {Fri Nov 11 00:00:00 EST 2016}

}

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Title: Evolution of structural and magnetic properties in LaxCe2-xCo16 Ti for $$0 \leq x \leq 2$$

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Title: Evolution of structural and magnetic properties in La_xCe_2-xCo₁₆ Ti for $$0 \leq x \leq 2$$