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Title: Investigating phase transition temperatures of size separated gadolinium silicide magnetic nanoparticles

Gadolinium silicide (Gd 5Si 4) nanoparticles (NPs) exhibit different properties compared to their parent bulk materials due to finite size, shape, and surface effects. NPs were prepared by high energy ball-milling of the as-cast Gd 5Si 4 ingot and size separated into eight fractions using time sensitive sedimentation in an applied dc magnetic field with average particle sizes ranging from 700 nm to 82 nm. The largest Gd 5Si 4 NPs order ferromagnetically at 316 K. A second anomaly observed at 110 K can be ascribed to a Gd 5Si 3 impurity. Here as the particle sizes decrease, the volume fraction of Gd 5Si 3 phase increases at the expense of the Gd 5Si 4 phase, and the ferromagnetic transition temperature of Gd 5Si 4 is reduced from 316 K to 310 K, while the ordering of the minor phase is independent of the particle size, remaining at 110 K.
Authors:
ORCiD logo [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [1]
  1. Virginia Commonwealth Univ., Richmond, VA (United States)
  2. Univ. of Texas at El Paso, El Paso, TX (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9624
Journal ID: ISSN 2158-3226
Grant/Contract Number:
1610967; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1434311
Alternate Identifier(s):
OSTI ID: 1416638

Hunagund, Shivakumar G., Harstad, Shane M., El-Gendy, Ahmed A., Gupta, Shalabh, Pecharsky, Vitalij K., and Hadimani, Ravi L.. Investigating phase transition temperatures of size separated gadolinium silicide magnetic nanoparticles. United States: N. p., Web. doi:10.1063/1.5007686.
Hunagund, Shivakumar G., Harstad, Shane M., El-Gendy, Ahmed A., Gupta, Shalabh, Pecharsky, Vitalij K., & Hadimani, Ravi L.. Investigating phase transition temperatures of size separated gadolinium silicide magnetic nanoparticles. United States. doi:10.1063/1.5007686.
Hunagund, Shivakumar G., Harstad, Shane M., El-Gendy, Ahmed A., Gupta, Shalabh, Pecharsky, Vitalij K., and Hadimani, Ravi L.. 2018. "Investigating phase transition temperatures of size separated gadolinium silicide magnetic nanoparticles". United States. doi:10.1063/1.5007686. https://www.osti.gov/servlets/purl/1434311.
@article{osti_1434311,
title = {Investigating phase transition temperatures of size separated gadolinium silicide magnetic nanoparticles},
author = {Hunagund, Shivakumar G. and Harstad, Shane M. and El-Gendy, Ahmed A. and Gupta, Shalabh and Pecharsky, Vitalij K. and Hadimani, Ravi L.},
abstractNote = {Gadolinium silicide (Gd5Si4) nanoparticles (NPs) exhibit different properties compared to their parent bulk materials due to finite size, shape, and surface effects. NPs were prepared by high energy ball-milling of the as-cast Gd5Si4 ingot and size separated into eight fractions using time sensitive sedimentation in an applied dc magnetic field with average particle sizes ranging from 700 nm to 82 nm. The largest Gd5Si4 NPs order ferromagnetically at 316 K. A second anomaly observed at 110 K can be ascribed to a Gd5Si3 impurity. Here as the particle sizes decrease, the volume fraction of Gd5Si3 phase increases at the expense of the Gd5Si4 phase, and the ferromagnetic transition temperature of Gd5Si4 is reduced from 316 K to 310 K, while the ordering of the minor phase is independent of the particle size, remaining at 110 K.},
doi = {10.1063/1.5007686},
journal = {AIP Advances},
number = 5,
volume = 8,
place = {United States},
year = {2018},
month = {1}
}

Works referenced in this record:

Characteristics of gadolinium-DTPA complex: a potential NMR contrast agent
journal, March 1984
  • Weinmann, H. J.; Brasch, R. C.; Press, W. R.
  • American Journal of Roentgenology, Vol. 142, Issue 3, p. 619-624
  • DOI: 10.2214/ajr.142.3.619