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Title: Giant negative thermal expansion at the nanoscale in the multifunctional material G d 5 ( Si , Ge ) 4

Abstract

In this work the thermal expansion of Gd5Si1.3Ge2.7 magnetic nanogranules was studied. A crossover from positive (macro- and microscale in the literature) towards a negative thermal expansion (at nanoscale) is observed. The negative thermal expansion (NTE) behavior was found in two temperature windows: 90-160 K ($$β^{LT}$$ similar to-32.2 ppm K-1), and within the room temperature 255-340 K, where a giant NTE was observed (-69 ppm K-1). The key atomic mechanism driving the NTE is identified as an atomic triplet-chain flexibility. The results suggest that the NTE behavior emerges as a size-reduction effect caused by the intrinsic nanoparticles surface pressure (estimated at 11 kbar), leading to the positive thermal expansion-NTE crossover at the nanoscale.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [1]; ORCiD logo [1]
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  1. Univ. do Porto (Portugal)
  2. Virginia Commonwealth Univ., Richmond, VA (United States)
  3. Iowa State Univ., Ames, IA (United States); Ames Lab., Ames, IA (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
Fundação para a Ciência e a Tecnologia (FCT); Federación Española de Enfermedades Raras (FEDER); Quadro de Referência Estratégica Nacional (QREN); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); USDOE Office of Science (SC)
OSTI Identifier:
1617892
Grant/Contract Number:  
AC02-06CH11357; SFRH/BD/88440/2012; DL57/2016; 156077/2018-3
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 13; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Condensed Matter & Materials Physics; Magnetocaloric effect

Citation Formats

Belo, João H., Pires, Ana L., Gomes, Isabel T., Andrade, V., Sousa, João B., Hadimani, Ravi L., Jiles, David C., Ren, Yang, Zhang, Xiaoyi, Araújo, João P., and Pereira, André M. Giant negative thermal expansion at the nanoscale in the multifunctional material Gd5(Si,Ge)4. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.134303.
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Belo, João H., Pires, Ana L., Gomes, Isabel T., Andrade, V., Sousa, João B., Hadimani, Ravi L., Jiles, David C., Ren, Yang, Zhang, Xiaoyi, Araújo, João P., & Pereira, André M. Giant negative thermal expansion at the nanoscale in the multifunctional material Gd5(Si,Ge)4. United States. https://doi.org/10.1103/PhysRevB.100.134303
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Belo, João H., Pires, Ana L., Gomes, Isabel T., Andrade, V., Sousa, João B., Hadimani, Ravi L., Jiles, David C., Ren, Yang, Zhang, Xiaoyi, Araújo, João P., and Pereira, André M. Mon . "Giant negative thermal expansion at the nanoscale in the multifunctional material Gd5(Si,Ge)4". United States. https://doi.org/10.1103/PhysRevB.100.134303. https://www.osti.gov/servlets/purl/1617892.
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@article{osti_1617892,
title = {Giant negative thermal expansion at the nanoscale in the multifunctional material Gd5(Si,Ge)4},
author = {Belo, João H. and Pires, Ana L. and Gomes, Isabel T. and Andrade, V. and Sousa, João B. and Hadimani, Ravi L. and Jiles, David C. and Ren, Yang and Zhang, Xiaoyi and Araújo, João P. and Pereira, André M.},
abstractNote = {In this work the thermal expansion of Gd5Si1.3Ge2.7 magnetic nanogranules was studied. A crossover from positive (macro- and microscale in the literature) towards a negative thermal expansion (at nanoscale) is observed. The negative thermal expansion (NTE) behavior was found in two temperature windows: 90-160 K ($β^{LT}$ similar to-32.2 ppm K-1), and within the room temperature 255-340 K, where a giant NTE was observed (-69 ppm K-1). The key atomic mechanism driving the NTE is identified as an atomic triplet-chain flexibility. The results suggest that the NTE behavior emerges as a size-reduction effect caused by the intrinsic nanoparticles surface pressure (estimated at 11 kbar), leading to the positive thermal expansion-NTE crossover at the nanoscale.},
doi = {10.1103/PhysRevB.100.134303},
journal = {Physical Review B},
number = 13,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}
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https://doi.org/10.1103/PhysRevB.100.134303
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