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Superparamagnetic bimetallic iron-palladium nanoalloy: synthesis and characterization
Rabia Nazir1, Muhammad Mazhar, M Javed Akhtar
1Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.
Nanotechnology
|August 10, 2011
Summary
Synthesized iron-palladium (Fe-Pd) nanoalloys (15-30 nm) exhibit air stability and superparamagnetic properties. These single-phase nanoparticles demonstrate high magnetic susceptibility, making them promising for various applications.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Iron-palladium (Fe-Pd) nanoalloys are of interest due to their unique magnetic and structural properties.
- Controlling the synthesis of single-phase Fe-Pd nanoparticles is crucial for understanding their behavior.
Purpose of the Study:
- To synthesize and characterize Fe-Pd nanoalloys in the 15-30 nm size range.
- To investigate the phase, stability, and magnetic properties of the synthesized Fe-Pd nanoalloy.
Main Methods:
- Low-temperature thermal decomposition of coprecipitated iron and palladium complexes ([Fe(Bipy)3]Cl2 and [Pd(Bipy)3]Cl2) in an argon atmosphere.
- Characterization using EDX-RF, XRD, AFM, TEM, magnetometry, (57)Fe Mössbauer, and impedance spectroscopy.
Main Results:
- Successfully synthesized air-stable, silvery-black Fe-Pd nanoalloy particles (15-30 nm).
- The nanoalloy is single-phase with iron sites having up to 11 nearest neighbors.
- The material exhibits superparamagnetism with high magnetic susceptibility, low coercivity, and a significant hyperfine field.
Conclusions:
- The low-temperature synthesis route yields a stable, single-phase Fe-Pd nanoalloy.
- The observed superparamagnetic behavior and magnetic properties are consistent with the nanoalloy's structure and composition.
