Fe–Ni solid solutions in nano-size dimensions: Effect of hydrogen annealing

Journal Article · Mon Feb 15 00:00:00 EST 2016 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.10.058· OSTI ID:22581447

Kumar, Asheesh ^[1]; Meena, S. S. ^[2]; Banerjee, S. ^[1]; Yusuf, S. M. ^[2]

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1. Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)
2. Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)

Highlights: • Fe–Ni solid solution with nano-size dimensions were prepared and characterized. • Both as prepared and hydrogenated solid solutions have FCC structure of Ni. • Paramagnetic and ferromagnetic domains coexist in these samples. - Abstract: Nanoparticles of Ni{sub 0.50}Fe{sub 0.50} and Ni{sub 0.75}Fe{sub 0.25} alloys were prepared by chemical reduction in ethylene glycol medium. XRD and {sup 57}Fe Mössbauer studies have confirmed the formation of Fe–Ni solid solution in nano-size dimensions with FCC structure. These samples consist of both ferromagnetic and paramagnetic domains which have been attributed to the coexistence of large and small particles as confirmed by atomic force microscopic (AFM) and {sup 57}Fe Mössbauer spectroscopic studies. Improved extent of Fe–Fe exchange interaction existing in Ni{sub 0.50}Fe{sub 0.50} alloy compared to Ni{sub 0.75}Fe{sub 0.25} alloy explains the observed increase in the relative extent of ferromagnetic domains compared to paramagnetic domains in the former sample. Increase in the relative extent of ferromagnetic domains for hydrogenated alloys is due to increase in particle size brought about by the high temperature activation prior to hydrogenation.

• OSTI ID: 22581447
• Journal Information: Materials Research Bulletin, Vol. 74; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ATOMIC FORCE MICROSCOPY
COMPARATIVE EVALUATIONS
EXCHANGE INTERACTIONS
FCC LATTICES
FERROMAGNETIC MATERIALS
GLYCOLS
HYDROGEN
HYDROGENATION
INTERMETALLIC COMPOUNDS
IRON 57
MAGNETIC PROPERTIES
MOESSBAUER EFFECT
NANOPARTICLES
PARAMAGNETISM
PARTICLE SIZE
SOLID SOLUTIONS
SOLIDS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION