Ultrawide Temperature Range Super-Invar Behavior of R2(Fe,Co)17 Materials (R = Rare Earth)

Yili Cao, Kun Lin, Sergii Khmelevskyi, Maxim Avdeev, Keith M. Taddei, Qiang Zhang, Qingzhen Huang, Qiang Li, Kenichi Kato, Chiu Chung Tang, Alexandra Gibbs, Chin-Wei Wang, Jinxia Deng, Jun Chen, Hongjie Zhang, and Xianran Xing
Phys. Rev. Lett. 127, 055501 – Published 30 July 2021
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Abstract

Super Invar (SIV), i.e., zero thermal expansion of metallic materials underpinned by magnetic ordering, is of great practical merit for a wide range of high precision engineering. However, the relatively narrow temperature window of SIV in most materials restricts its potential applications in many critical fields. Here, we demonstrate the controlled design of thermal expansion in a family of R2(Fe,Co)17 materials (R=rare Earth). We find that adjusting the Fe-Co content tunes the thermal expansion behavior and its optimization leads to a record-wide SIV with good cyclic stability from 3–461 K, almost twice the range of currently known SIV. In situ neutron diffraction, Mössbauer spectra and first-principles calculations reveal the 3d bonding state transition of the Fe-sublattice favors extra lattice stress upon magnetic ordering. On the other hand, Co content induces a dramatic enhancement of the internal molecular field, which can be manipulated to achieve “ultrawide” SIV over broad temperature, composition and magnetic field windows. These findings pave the way for exploiting thermal-expansion-control engineering and related functional materials.

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  • Received 29 January 2021
  • Accepted 23 June 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.055501

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yili Cao1, Kun Lin1, Sergii Khmelevskyi2, Maxim Avdeev3,4, Keith M. Taddei5, Qiang Zhang5, Qingzhen Huang6, Qiang Li1, Kenichi Kato7, Chiu Chung Tang8, Alexandra Gibbs9, Chin-Wei Wang10, Jinxia Deng1, Jun Chen1, Hongjie Zhang11, and Xianran Xing1,*

  • 1Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China
  • 2Research Center for Computational Materials Science and Engineering, Vienna University of Technology, Karlplatz 13, A-1040 Vienna, Austria
  • 3Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
  • 4School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
  • 5Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 6NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
  • 7RIKEN SPring- 8 Center, Hyogo 679-5148, Japan
  • 8Diamond Light Source Ltd., Didcot OX11 0DE, United Kingdom
  • 9ISIS Neutron and Muon Source, Science and Technology Facilities Council, Didcot OX11 0QX, United Kingdom
  • 10Neutron Group, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
  • 11State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

  • *Corresponding author. xing@ustb.edu.cn

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Issue

Vol. 127, Iss. 5 — 30 July 2021

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