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Title: Giant negative thermal expansion covering room temperature in nanocrystalline GaN{sub x}Mn{sub 3}

Abstract

Nanocrystalline antiperovskite GaN{sub x}Mn{sub 3} powders were prepared by mechanically milling. The micrograin GaN{sub x}Mn{sub 3} 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.

Authors:
; ; ; ; ; ; ;  [1]; ; ;  [2]
  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)
  2. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026 (China)
Publication Date:
OSTI Identifier:
22482164
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; ATOMIC DISPLACEMENTS; CONTRACTION; CRYSTALS; DISTRIBUTION FUNCTIONS; GALLIUM NITRIDES; GRAIN SIZE; MILLING; NANOSTRUCTURES; PARAMAGNETISM; PHASE TRANSFORMATIONS; POWDERS; TEMPERATURE RANGE 0273-0400 K; THERMAL EXPANSION; X RADIATION

Citation Formats

Lin, J. C., Tong, P., E-mail: tongpeng@issp.ac.cn, Chen, L., Guo, X. G., Yang, C., Song, B., Wu, Y., Lin, S., Song, W. H., Zhou, X. J., Lin, H., E-mail: linhe@sinap.ac.cn, Ding, Y. W., Bai, Y. X., Sun, Y. P., E-mail: ypsun@issp.ac.cn, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093. Giant negative thermal expansion covering room temperature in nanocrystalline GaN{sub x}Mn{sub 3}. United States: N. p., 2015. Web. doi:10.1063/1.4932067.
Lin, J. C., Tong, P., E-mail: tongpeng@issp.ac.cn, Chen, L., Guo, X. G., Yang, C., Song, B., Wu, Y., Lin, S., Song, W. H., Zhou, X. J., Lin, H., E-mail: linhe@sinap.ac.cn, Ding, Y. W., Bai, Y. X., Sun, Y. P., E-mail: ypsun@issp.ac.cn, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, & Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093. Giant negative thermal expansion covering room temperature in nanocrystalline GaN{sub x}Mn{sub 3}. United States. https://doi.org/10.1063/1.4932067
Lin, J. C., Tong, P., E-mail: tongpeng@issp.ac.cn, Chen, L., Guo, X. G., Yang, C., Song, B., Wu, Y., Lin, S., Song, W. H., Zhou, X. J., Lin, H., E-mail: linhe@sinap.ac.cn, Ding, Y. W., Bai, Y. X., Sun, Y. P., E-mail: ypsun@issp.ac.cn, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093. 2015. "Giant negative thermal expansion covering room temperature in nanocrystalline GaN{sub x}Mn{sub 3}". United States. https://doi.org/10.1063/1.4932067.
@article{osti_22482164,
title = {Giant negative thermal expansion covering room temperature in nanocrystalline GaN{sub x}Mn{sub 3}},
author = {Lin, J. C. and Tong, P., E-mail: tongpeng@issp.ac.cn and Chen, L. and Guo, X. G. and Yang, C. and Song, B. and Wu, Y. and Lin, S. and Song, W. H. and Zhou, X. J. and Lin, H., E-mail: linhe@sinap.ac.cn and Ding, Y. W. and Bai, Y. X. and Sun, Y. P., E-mail: ypsun@issp.ac.cn and Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093},
abstractNote = {Nanocrystalline antiperovskite GaN{sub x}Mn{sub 3} powders were prepared by mechanically milling. The micrograin GaN{sub x}Mn{sub 3} 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.},
doi = {10.1063/1.4932067},
url = {https://www.osti.gov/biblio/22482164}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 13,
volume = 107,
place = {United States},
year = {Mon Sep 28 00:00:00 EDT 2015},
month = {Mon Sep 28 00:00:00 EDT 2015}
}