Superparamagnetic bimetallic iron–palladium nanoalloy: synthesis and characterization

Iron nanoparticles of various sizes have been synthesized using the chemical route which involves the preparation of iron bipyridine complexes in presence of different capping agents followed by thermal decomposition at 450 • C in inert atmosphere. The bimetallic nanoalloys of Fe with Mg and Pd have also been prepared by following the same route. The resulting nanoparticles have been characterized by EDX-RF, XRD, AFM and 57 Fe Mössbauer spectroscopy. The appearance of quadrupole doublets in the Mössbauer spectra of Fe nanoparticles indicates the absence of magnetic interaction and variation in parameters is due to the varying particle size. The Mössbauer spectrum of Fe-Mg 2 bimetallic nanoalloy shows two doublets indicating the presence of superparamagnetism. The two doublets can be attributed to change in s-electron density of iron resulting from its two neighboring magnesium atoms. Fe-Pd nanoalloy Mössbauer spectrum is characterized by having a superparamagnetic doublet and a ferromagnetic sextet.

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“…After that the contents were allowed to achieve room temperature under argon atmosphere to yield Fe-Pd (1:1) alloy. Yield 85% [14].…”

Section: Iron-palladium Nanoalloymentioning

confidence: 99%

“…Mössbauer spectra of iron nanoalloys showing changes in spectra and Mössbauer parameters with change in metals a Fe-Mg 2 , b Fe-Pd (Reproduced from[14])…”

mentioning

confidence: 99%

Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

et al. 2009

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“…The fired precursor material is added with Fe-Pd nano-alloy (prepared by already reported procedure [5]) and mixed for about an hour and fired at 890 • C for 24 h. At the third stage, Cu 0.5 Ba 2 Ca 3 Cu 4 O 12−δ (Fe-Pd 0, 0.5, 1.0, 1.5 wt %) precursor material was added with Tl 2 O 3 to give Cu 0.5 Tl 0.5 -1234/(Pd 0.0, 0.5, 1.0, 1.5 wt %; Fe-Pd 0, 0.5, 1.0, 1.5 wt %) as final compound. Thallium oxide was mixed with the precursor material for about an hour and then palletized under a 3.8 tons/cm 2 pressures.…”

Section: Synthesismentioning

confidence: 99%

“…These nano-alloys have shown fcc structure and super-paramagnetic behavior in magnetic field [4]. As a general rule when ferromagnetic 3d (Fe) and non-ferromagnetic 4d (Pd) transition metals are alloyed, their moments couple parallel to each other resulting in enhanced magnetic moment [1,5]. In case of nanoparticles, when size is too small, the domain formation does not remain feasible and particles exist as single domain [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Paraconductivity Studies of Fe–Pd Nanoparticles Added Cu0.5Tl0.5Ba2Ca3Cu4 O 12−δ Superconductors

Khan

Iqbal

Abbass

et al. 2015

J Supercond Nov Magn

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Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12−δ /(Fe-Pd 0, 0.5, 1.0, 1.5 %) superconductors are prepared at normal pressure by using three-step method. Alloy of Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12−δ /(Fe-Pd 1 %) have shown maximum increase in the magnitude of superconductivity. Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12−δ /(Fe-Pd 0, 0.5, 1.0, 1.5 %) samples have shown T c (R = 0) around 106, 105.3, 102, and 100 K and the onset of diamagnetism around 113, 110, 102, and 105 K, respectively. A comparison of X-ray diffraction (XRD) scans of Fe-Pd nanoparticles with Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12−δ /(Fe-Pd 0.5, 1.0, 1.5 %) superconducting samples have shown that the nanoparticles of Fe-Pd are quite stable in the matrix of Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12−δ samples even after repeated firing at 890 • C. With increase addition of Fe-Pd nanoparticles, the axes length increases, showing some inclusion of nanoparticle into the unit cell of Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12−δ samples from the termination ends of crystal. The inclusion of Fe-Pd in the superconducting Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12−δ grains is also evidenced in Fourier transform infrared spectroscopy (FTIR) absorption measurements. The Fe-Pd nanoparticles added in Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12−δ samples have been found to decrease the population of inter-grain voids that is found to increase the coherence length along the c-axis and the

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“…The size control of nanoparticles was achieved by controlling the concentration and type of stabilizers and reaction conditions [6,7]. Fe-Pd nanoalloy in the particle size range of 15e30 nm was synthesized by the relatively low temperature thermal decomposition of co-precipitated [Fe(Bipy) 3 ]Cl 2 and [Pd(Biph) 3 ]Cl 2 in an inert atmosphere [8].…”

Section: Introductionmentioning

confidence: 99%

Consolidation of FePd nanoparticles by spark plasma sintering

et al. 2010

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Superparamagnetic bimetallic iron–palladium nanoalloy: synthesis and characterization

Cited by 32 publications

References 41 publications

Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

Synthesis and Paraconductivity Studies of Fe–Pd Nanoparticles Added Cu0.5Tl0.5Ba2Ca3Cu4 O 12−δ Superconductors

Consolidation of FePd nanoparticles by spark plasma sintering

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