Effect of Ce substitution on the structural and magnetic properties of Nd2Fe14B

DOI: 10.1016/j.actamat.2020.08.084

Authors: Zhongchong Lin (Peking University) , Liang Zha (Peking University) , Fanggui Wang (Peking University) , Zhou Liu (Peking University) , Rui Wu (University of Cambridge) , Jie Yang (Peking University) , Mingzhu Xue (Peking University) , Wenyun Yang (Peking University; Beijing Key Laboratory for Magnetoelectric Materials and Devices) , Guang Tian (Peking University; Beijing Key Laboratory for Magnetoelectric Materials and Devices) , Xiaobai Ma (China Institute of Atomic Energy) , Liang Qiao (Lanzhou University) , Alexandra Franz (Helmholtz-Zentrum Berlin für Materialien und Energie) , Qi An (Royal Holloway, University of London) , Wenqing Liu (Royal Holloway, University of London) , Changsheng Wang (Peking University; Beijing Key Laboratory for Magnetoelectric Materials and Devices) , Jinbo Yang (Peking University; Beijing Key Laboratory for Magnetoelectric Materials and Devices)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Materialia , VOL 200 , PAGES 502 - 509

State: Published (Approved)
Published: November 2020
Diamond Proposal Number(s): 16538

Abstract: The effect of Ce substitution on the structural and magnetic properties of (Nd1-δCeδ)2Fe14B (0 < δ < 1) series was systematically studied using neutron diffraction, 57Fe Mössbauer spectroscopy and X-ray magnetic circular dichroism (XMCD). An anomaly in the lattice parameters was observed in a sample with composition in the range of 0.2 < δ < 0.4, where a phase separation happens and the 2:14:1 isostructural dual-main-phases (IDMPs) appear. Outside this composition range, Ce shows a preferential occupation at the 4g site than the 4f site and a preferable Ce3+ valence state. The average magnetic moments of Nd/Ce and Fe atoms decrease with the increasing of δ. The magnitude of the Fe moments at non-equivalent sites is related to several factors, such as the Fe coordination number, the Wigner-Seitz cell volume, and the Boron atom effect. These results reveal the microscopic mechanisms for the structural and magnetic properties of Ce-substitution Nd2Fe14B, providing perspective on developing the next-generation low-cost and high-performance permanent magnetic materials.

Journal Keywords: Ce substitution; Phase separation; Magnetic properties; Neutron diffraction; Mössbauer spectroscopy; Permanent magnets

Subject Areas: Materials, Physics


Instruments: I06-Nanoscience , I10-Beamline for Advanced Dichroism

Added On: 20/09/2020 20:38

Discipline Tags:

Hard condensed matter - electronic properties Physics Magnetism Materials Science

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Absorption Spectroscopy (XAS) X-ray Magnetic Circular Dichroism (XMCD)