Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session G70: Poster Session I (2:00pm-5:00pm)
2:00 PM,
Tuesday, March 5, 2019
BCEC
Room: Exhibit Hall
Abstract: G70.00130 : A preliminary investigation of large shift in transition temperature (Tc) in Gd5Si3 nanoparticles*
Presenter:
Shivakumar Hunagund
(Virginia Commonwealth University)
Authors:
Shivakumar Hunagund
(Virginia Commonwealth University)
Shane M Harstad
(Virginia Commonwealth University)
Shalabh Gupta
(Ames Laboratory, US Dept. of Energy, Iowa State University, Ames, IA 50011)
Vitalij K Pecharsky
(Dept. of Material Science and Engineering, Ames Laboratory, Iowa State University, Ames, IA 50011)
Magundappa Hadimani
(Virginia Commonwealth University)
However, a large increase in Tc in Gd5Si3 NPs have been observed in the ball-milled gadolinium silicide. SEM images shows particle sizes ranging from 50 nm to >2 μm. XRD analysis on pre-separated sample show that ferromagnetic Gd5Si4 is the major phase while paramagnetic Gd5Si3 is the minor phase. Magnetic properties measured in VSM reveal that the Tc decreases for Gd5Si4 phase from 332K for bulk to 315K for ball-milled sample. Another Tc observed at 80K is attributed to Gd5Si3 phase undergoes large shift in its transition temperature at 110K and remains constant irrespective of particle sizes.
Plausible reasons for the increase in Tc for Gd5Si3 NPs could be due to the effect of high energy mechanical ball-milling process that could induce structural changes, lattice strains, exchange interaction between phases in a particle, or formation of new phase.
*Work at the Ames Lab was supported by DOE (contract No. DE-AC02-07CH11358). Work at VCU was funded by NSF, Award No.: 1610967.
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