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Title: Thermal plasma processed ferro-magnetically ordered face-centered cubic iron at room temperature

Here, we report tailor made phase of iron nanoparticles using homogeneous gas phase condensation process via thermal plasma route. It was observed that crystal lattice of nano-crystalline iron changes as a function of operating parameters of the plasma reactor. In the present investigation iron nanoparticles have been synthesized in presence of argon at operating pressures of 125–1000 Torr and fixed plasma input DC power of 6 kW. It was possible to obtain pure fcc, pure bcc as well as the mixed phases for iron nanoparticles in powder form as a function of operating pressure. The as synthesized product was characterized for understanding the structural and magnetic properties by using X-ray diffraction, vibrating sample magnetometer, and Mössbauer spectroscopy. The data reveal that fcc phase is ferromagnetically ordered with high spin state, which is unusual whereas bcc phase is found to be ferromagnetic as usual. Finally, the structural and magnetic properties are co-related.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Physics, Savitribai Phule Pune University, Pune 411007 (India)
  2. Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)
Publication Date:
OSTI Identifier:
22308170
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BCC LATTICES; FCC LATTICES; HIGH SPIN STATES; IRON; MAGNETIC PROPERTIES; MOESSBAUER EFFECT; NANOPARTICLES; NANOSTRUCTURES; PLASMA; POWDERS; SPECTROSCOPY; TEMPERATURE RANGE 0273-0400 K; VIBRATING SAMPLE MAGNETOMETERS; X-RAY DIFFRACTION