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Transforming Thermal Expansion from Positive to Negative: The Case of Cubic Magnetic Compounds of (Zr,Nb)Fe2

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [3];  [4];  [1];  [5];  [6];  [7];  [1];  [1]
  1. Univ. of Science and Technology, Beijing (China)
  2. Zhengzhou Univ. (China)
  3. National Inst. of Natural Sciences (NINS), Okazaki (Japan). Inst. for Molecular Sciences
  4. Univ. of Science and Technology, Beijing (China). State Key Lab. for Advanced Metals and Materials
  5. Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. of Cryogenics
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Negative thermal expansion (NTE) is an intriguing property for not only fundamental studies but also technological applications. However, few NTE materials are available compared with the huge amount of positive thermal expansion materials. The discovery of new NTE materials remains challenging. In this paper, we report a chemical modification strategy to transform thermal expansion from positive to negative in cubic magnetic compounds of (Zr,Nb)Fe2 by tuning the magnetic exchange interaction. Furthermore, an isotropic zero thermal expansion can be established in Zr0.8Nb0.2Fe21 = 1.4 x 10-6 K-1, 3-470 K) over a broad temperature range that is even wider than that of the prototype Invar alloy of Fe0.64Ni0.36. The NTE of (Zr,Nb)Fe2 is originated from the weakened magnetic exchange interaction and the increased d electrons of Fe by the Nb chemical substitution, so that the magnetovolume effect overwhelms the contribution of anharmonic lattice vibration.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Fundamental Research Funds for the Central Universities; National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1756069
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 5 Vol. 11; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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