Flux growth and characterization of Ce-substituted Nd2Fe14B single crystals

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:434

Article

Susner, Michael A.¹  Conner, Benjamin S.¹  Saparov, Bayrammurad I.^1,4,5  McGuire, Michael A.¹  Crumlin, Ethan J.²  Veith, Gabriel M.¹  Cao, Huibo³  Shanavas, Kavungal V.¹  Parker, David S.¹  Chakoumakos, Bryan C.³  Sales, Brian C.¹ 

[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[2] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[3] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[4] Duke Univ, Dept Mech Engn & Mat Sci, Durham, NC 27708 USA

[5] Duke Univ, Dept Chem, Durham, NC 27708 USA

关键词: Permanent magnets;    Nd2Fe14B;    Rare earth magnets;    Single crystal synthesis;    Neutron diffraction;   

DOI  :  10.1016/j.jmmm.2016.10.127

来源: Elsevier

【 摘 要 】

Single crystals of (Nd1-xCex)(2)Fe14B, some reaching similar to 6 x 8 x 8 mm(3) in volume, are grown out of Fe-(Nd, Ce) flux. This crystal growth method allows for large (Nd1-xCex)(2)Fe14B single crystals to be synthesized using a simple flux growth procedure. Chemical and structural analyses of the crystals indicate that (Nd1-xCex)(2)Fe14B forms a solid solution until at least x=0.38 with a Vegard-like variation of the lattice constants with x. Refinements of single crystal neutron diffraction data indicate that Ce has a slight site preference (7: 3) for the 4g rare earth site over the 4f site. Magnetization measurements at 300 K show only small decreases with increasing Ce content in saturation magnetization (M-s) and anisotropy field (H-A), and Curie temperature (T-C). First principles calculations are carried out to understand the effect of Ce substitution on the electronic and magnetic properties. For a multitude of applications, it is expected that the advantage of incorporating lower-cost and more abundant Ce will outweigh the small adverse effects on magnetic properties. Ce-substituted Nd2Fe14B is therefore a potential high-performance permanent magnet material with substantially reduced Nd content.

【 授权许可】

Free