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

Journal Article · Fri Nov 11 00:00:00 EST 2016 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2016.11.078· OSTI ID:1337487

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

---

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

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-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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Critical Materials Institute (CMI)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1337487
• Alternate ID(s): OSTI ID: 1397605
• Journal Information: Journal of Alloys and Compounds, Vol. 695; ISSN 0925-8388
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

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