Influence of ball milling and annealing conditions on the properties of L1{sub 0} FePt nanoparticles fabricated by a new green chemical synthesis method

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4866553· OSTI ID:22273792

Capobianchi, A. ^[1]; Gallagher, R. ^[2]; Hadjipanayis, G. C. ^[3]

---

1. Istituto di Struttura della Materia. CNR, Rome (Italy)
2. Department of Mechanical Engineering, University of Delaware, Newark, Delaware 19716 (United States)
3. Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)

In this work, a new green chemical strategy for the synthesis of L1{sub 0} FePt alloy nanoparticles is reported. The precursor is a polycrystalline molecular complex (Fe(H{sub 2}O){sub 6}PtCl{sub 6}), in which Fe and Pt atoms are arranged on alternating planes and milled with NaCl to form nanocrystals. Then the mixture was annealed under reducing atmosphere (5% H{sub 2} and 95% Ar) at temperatures varying from 350 °C to 500 °C for 2 h with a heating rate of 5 °C/min. After the reduction, the mixture was washed with water to remove the NaCl and L1{sub 0} FePt nanoparticles were obtained. The X-Ray Diffraction pattern showed the presence of the characteristic peaks of the fct phase of FePt nanoparticles. Influence of precursor/NaCl ratio and ball milling time on particle size was investigated. Transmission electron microscopy images revealed that smaller precursor/NaCl ratio (10 mg/20 g) and longer milling time (15 h) lead to smaller particle size and narrower size distribution. Milling time does not influence the coercivity much but the decrease of the amount of precursor leads to a decrease of coercivity from 10.8 kOe to 4.8 kOe.

• OSTI ID: 22273792
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
ANNEALING
COERCIVE FORCE
HEATING RATE
HYDRATES
INTERMETALLIC COMPOUNDS
IRON
IRON COMPOUNDS
MILLING
NANOSTRUCTURES
PARTICLE SIZE
PARTICLES
PLATINUM
POLYCRYSTALS
SODIUM CHLORIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION