Phenomenological calculation of the Fe-Pd-based L10-ordered phase in the Fe-Pd-Ni ternary system

Horiuchi, Toshiaki; Igarashi, Masaaki; Abe, Fujio; Ohkubo, Kenji; Miura, Seiji; Mohri, Tetsuo

doi:10.1007/s11661-005-0320-z

Cited by 6 publications

(3 citation statements)

References 17 publications

(54 reference statements)

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“…The ordered FePd phase exhibited the highest coercivity ( H c ) of the synthesized nanoalloy particles 2f. 8 With a nickel dopant concentration of 15 wt %, the coercivity decreases drastically, which is in line with the ternary FePdNi phase diagram 9. Above a nickel dopant concentration of approximately 15 %, it significantly reduces the ordering parameter, whereas below this critical concentration, the system can consist of a mixture of ordered and disordered phases.…”

Section: Methodssupporting

confidence: 52%

Metal Redox Processes for the Controlled Synthesis of Metal Alloy Nanoparticles

et al. 2015

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Nanocrystalline metals have received widespread interest and found various applications owing to their magnetic and catalytic properties and in energy-related fields. A flexible approach for the growth of nanoalloys with controlled properties and well-defined structures on the atomic scale is thus greatly desired. A new synthetic method that avoids incompatible reduction potentials and rates would be critical to grow metal nanostructures with high purities and the desired stoichiometries. A metal-redox strategy that employs spontaneous oxidation/reduction reactions to grow nanocrystalline alloys using molecular-scale zerovalent metal precursors is now described. The selection of suitable zerovalent metal species allows for thermodynamic control of the compositional stoichiometry during the temperature-dependent formation of the metal alloy nanoparticles. A practical and scalable strategy for nanoalloy growth that can potentially produce key metal components of superior metallurgical quality for catalytic and magnetic systems has thus been developed.

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Section: Methodssupporting

confidence: 52%

Metal Redox Processes for the Controlled Synthesis of Metal Alloy Nanoparticles

et al. 2015

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“…Te rnary FeNiPd nanoalloy systems with Fe/Ni/Pd molar ratios of 2:x:y (x+y=1) were investigated. [9] Above an ickel dopant concentration of approximately 15 %, it significantly reduces the ordering parameter, whereas below this critical concentration, the system can consist of am ixture of ordered and disordered phases.Ana-Fephase was apparent in all ternary alloys,b ut not in the binary FeNi alloy.T his is due to the thermodynamic stability of a-iron formation at an iron content of greater than 50 %i nt he FePd phase diagram. [2f, 8] With an ickel dopant concentration of 15 wt %, the coercivity decreases drastically,w hich is in line with the ternary FePdNi phase diagram.…”

Section: Angewandte Zuschriftenmentioning

confidence: 99%

“…[2f, 8] With an ickel dopant concentration of 15 wt %, the coercivity decreases drastically,w hich is in line with the ternary FePdNi phase diagram. [9] Above an ickel dopant concentration of approximately 15 %, it significantly reduces the ordering parameter, whereas below this critical concentration, the system can consist of am ixture of ordered and disordered phases.Ana-Fephase was apparent in all ternary alloys,b ut not in the binary FeNi alloy.T his is due to the thermodynamic stability of a-iron formation at an iron content of greater than 50 %i nt he FePd phase diagram. Once the pure FeNi system has been reached, the a-iron peak disappears as an a-iron phase is not thermodynamically stable in aF eNi alloy.…”

mentioning

confidence: 99%

Metal Redox Processes for the Controlled Synthesis of Metal Alloy Nanoparticles

et al. 2015

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Nanocrystalline metals have received widespread interest and found various applications owing to their magnetic and catalytic properties and in energy-related fields.Aflexible approach for the growth of nanoalloys with controlled properties and well-defined structures on the atomic scale is thus greatly desired. Anew synthetic method that avoids incompatible reduction potentials and rates would be critical to grow metal nanostructures with high purities and the desired stoichiometries.Ametal-redoxs trategy that employs spontaneous oxidation/reduction reactions to grown anocrystalline alloys using molecular-scale zerovalent metal precursors is nowd escribed. The selection of suitable zerovalent metal species allows for thermodynamic control of the compositional stoichiometry during the temperature-dependent formation of the metal alloynanoparticles.Apractical and scalable strategy for nanoalloy growth that can potentially produce key metal components of superior metallurgical quality for catalytic and magnetic systems has thus been developed.

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Fe-Ni-Pd (Iron-Nickel-Palladium)

Raghavan¹

2007

J Phs Eqil and Diff

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The previous review of this system by [1992Rag] presented a liquidus surface. The predominant phase of primary crystallization on this surface is the continuous face-centered cubic (fcc) solid solution c. Recently, [2005Hor] combined the cluster variation method with the Lennard-Jones type of pairwise atomic interaction energies, to compute the phase equilibria in the region of the ordered L1 0 phase. Binary SystemsThe Fe-Ni phase diagram [1991Swa] is characterized by a very narrow solidification range. A continuous solid solution denoted c between face-centered cubic (fcc) Fe and Ni is stable over a wide range of temperature. At 517°C, an ordered phase FeNi 3 (L1 2 , AuCu 3 -type cubic) forms congruently from c. Two other ordered phases FeNi (L1 0 , AuCu-type tetragonal) and Fe 3 Ni (L1 2 , AuCu 3 -type cubic) are known and considered to be metastable [1991Swa].The first-principle calculations of [2004Moh], however, suggested that L1 0 is a stable phase. In the Fe-Pd system [1993Oka], a continuous fcc solid solution c forms between fcc Fe and Pd in the temperature range of 1300 to 900°C. Two superstructures, FePd (AuCu-type tetragonal) and FePd 3 (AuCu 3 -type cubic), form congruently from c at 790 and 820°C, respectively. They have appreciable homogeneity ranges at lower temperatures. The Ni-Pd system is an isomorphous one, with the fcc phase c present at all subsolidus temperatures. Ternary Isothermal Sections[2005Hor] calculated and listed the Lennard-Jones type pairwise atomic interaction energies for the six pairs of atoms (Fe-Fe, Fe-Ni, etc.) of this ternary system. The tetragonality of the L1 0 structure was taken into account in determining the interatomic distances. The entropy term was estimated by the tetrahedron approximation of the cluster variation method. The free energy minimization was carried out by the Kikuchi iteration procedure. The partial isothermal sections calculated by in the region of the L1 0 phase at 650, 590, and 550°C are shown in Fig. 1.The calculations were checked with a limited number of experiments using an Fe-5 at.% Pd-5 at.% Ni alloy. The alloy in the martensitic condition was aged at 590°C just below the solvus of the L1 0 phase in the Fe-Pd system to allow its precipitation. The composition of the matrix and the precipitate analyzed with the energy dispersive spectroscopy indicated that Ni preferentially substitutes for Pd in the L1 0 phase.

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Phenomenological calculation of the Fe-Pd-based L10-ordered phase in the Fe-Pd-Ni ternary system

Cited by 6 publications

References 17 publications

Metal Redox Processes for the Controlled Synthesis of Metal Alloy Nanoparticles

Metal Redox Processes for the Controlled Synthesis of Metal Alloy Nanoparticles

Metal Redox Processes for the Controlled Synthesis of Metal Alloy Nanoparticles

Fe-Ni-Pd (Iron-Nickel-Palladium)

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