Nanocrystalline antiperovskite GaNxMn3 powders were prepared by mechanically milling. The micrograin GaNxMn3 exhibits an abrupt volume contraction at the antiferromagnetic (AFM) to paramagnetic (PM) (AFM-PM) transition. The temperature window of volume contraction (ΔT) is broadened to 50 K as the average grain size (⟨D⟩) is reduced to ∼30 nm. The corresponding coefficient of linear thermal expansion (α) reaches ∼ −70 ppm/K, which are comparable to those of giant NTE materials. Further reducing ⟨D⟩ to ∼10 nm, ΔT exceeds 100 K and α remains as large as −30 ppm/K (−21 ppm/K) for x = 1.0 (x = 0.9). Excess atomic displacements together with the reduced structural coherence, revealed by high-energy X-ray pair distribution functions, are suggested to delay the AFM-PM transition. By controlling ⟨D⟩, giant NTE may also be achievable in other materials with large lattice contraction due to electronic or magnetic phase transitions.
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28 September 2015
Research Article|
October 01 2015
Giant negative thermal expansion covering room temperature in nanocrystalline GaNxMn3
J. C. Lin;
J. C. Lin
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
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P. Tong;
P. Tong
a)
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
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X. J. Zhou;
X. J. Zhou
2
Shanghai Institute of Applied Physics
, Chinese Academy of Sciences, Shanghai 200120, China
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H. Lin;
H. Lin
b)
2
Shanghai Institute of Applied Physics
, Chinese Academy of Sciences, Shanghai 200120, China
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Y. W. Ding;
Y. W. Ding
3Hefei National Laboratory for Physical Sciences at Microscale,
University of Science and Technology of China
, Hefei 230026, China
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Y. X. Bai;
Y. X. Bai
3Hefei National Laboratory for Physical Sciences at Microscale,
University of Science and Technology of China
, Hefei 230026, China
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L. Chen;
L. Chen
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
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X. G. Guo;
X. G. Guo
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
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C. Yang
;
C. Yang
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
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B. Song;
B. Song
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
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Y. Wu;
Y. Wu
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
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S. Lin;
S. Lin
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
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W. H. Song;
W. H. Song
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
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Y. P. Sun
Y. P. Sun
c)
1Key Laboratory of Materials Physics,
Institute of Solid State Physics
, Chinese Academy of Sciences, Hefei 230031, China
4High Magnetic Field Laboratory,
Chinese Academy of Sciences
, Hefei 230031, China
5Collaborative Innovation Center of Advanced Microstructures,
Nanjing University
, Nanjing 210093, China
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Appl. Phys. Lett. 107, 131902 (2015)
Article history
Received:
August 17 2015
Accepted:
September 18 2015
Citation
J. C. Lin, P. Tong, X. J. Zhou, H. Lin, Y. W. Ding, Y. X. Bai, L. Chen, X. G. Guo, C. Yang, B. Song, Y. Wu, S. Lin, W. H. Song, Y. P. Sun; Giant negative thermal expansion covering room temperature in nanocrystalline GaNxMn3. Appl. Phys. Lett. 28 September 2015; 107 (13): 131902. https://doi.org/10.1063/1.4932067
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