Effect of Ce substitution on the structural and magnetic properties of Nd2Fe14B. (November 2020)

• Record Type: Journal Article
• Authors: Lin, Zhongchong; Zha, Liang; Wang, Fanggui; Liu, Zhou; Wu, Rui; Yang, Jie; Xue, Mingzhu; Yang, Wenyun; Tian, Guang; Ma, Xiaobai; Qiao, Liang; Franz, Alexandra; An, Qi; Liu, Wenqing; Wang, Changsheng; Yang, Jinbo
• Is Part Of: Acta materialia. Volume 200(2020)
• Page Start: 502
• Page End: 509
• Publication Date: 2020-11
• Subjects: Ce substitution -- Phase separation -- Magnetic properties -- Neutron diffraction -- Mössbauer spectroscopy -- Permanent magnets; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2020.08.084
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: The effect of Ce substitution on the structural and magnetic properties of (Nd1-δ Ceδ )2 Fe14 B (0 < δ < 1) series was systematically studied using neutron diffraction, 57 Fe 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 Ce 3+ 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 Nd2 Fe14 B, providing perspective on developing the next-generation low-cost and high-performance permanent magnetic materials. Graphical abstract: Image, graphical abstract