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Giant negative thermal expansion at the nanoscale in the multifunctional material Gd5 (Si,Ge) 4

Journal Article · · Physical Review B
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [1];  [1]
  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)
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.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Federación Española de Enfermedades Raras (FEDER); Fundação para a Ciência e a Tecnologia (FCT); Quadro de Referência Estratégica Nacional (QREN); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1617892
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 13 Vol. 100; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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