Chemically ordered FePt3 nanoparticles synthesized by a bimetallic precursor and their magnetic transitions

Song, Hyon Min; Kim, Wan Seop; Lee, Yong-Bok; Hong, Jung Hoon; Lee, Hyun Gyu; Hur, Nam Hwi

doi:10.1039/b818838f

Cited by 23 publications

(17 citation statements)

References 37 publications

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“…Alloying of iron nanoparticles with other metals can also be used to tune magnetic properties. Iron–platinum nanoparticles, especially, have varying magnetic properties; antiferromagnetic FePt particles are characterized by large coercivity or superparamagnetism, whereas FCC-structured FePt 3 is antiferromagnetic with high Curie temperature …”

Section: Discussionmentioning

confidence: 99%

“…Iron− platinum nanoparticles, especially, have varying magnetic properties; antiferromagnetic FePt particles are characterized by large coercivity 63 or superparamagnetism, 64 whereas FCCstructured FePt 3 is antiferromagnetic with high Curie temperature. 65 Oxides are a third class of iron compounds whose catalytic activity could be manipulated by a magnetic field. Several iron oxides present in FTS and WGS are antiferrimagnetic or have Fe(II) in octahedral coordination 28,55 both of which have plausible structures for magnetically controlled reactivity.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Magnetic States on the Reactivity of an FCC(111) Iron Surface

Melander¹,

Laasonen²,

Jónsson

2014

J. Phys. Chem. C

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We have carried out calculations to compare the catalytic activity of ferromagnetic (FM) and antiferromagnetic (AFM) states of the (111) surface of an FCC iron film by evaluating the reaction energy and activation barrier for the dissociation of H 2 and CO. The calculations were carried out using density functional theory and a meta-GGA approximation of the energy functional. The results show significant sensitivity to the magnetic state of the surface. We find that charge transfer upon adsorption is more efficient at the AFM2 surface. For H 2 , this leads to barrierless dissociative adsorption on the AFM2 surface, while a molecular adsorbed state is metastable at the FM surface, separated by an activation energy of 0.35 eV from the dissociated state. CO adsorbs more strongly on the AFM2 surface, but the activation energy for dissociation is 0.27 eV lower on the FM surface mainly because the energy of the transition state is lower. The difference in reactivity is analyzed in terms of integrated density difference and spin-dependent projected density of states. It is concluded that empty, back-bonding states offer a more favorable overlap at the FM surface leading to a more facile CO dissociation. The results indicate that catalytic activity can be strongly affected by the application of a magnetic field when it can induce a change in the magnetic state of the catalyst.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Magnetic States on the Reactivity of an FCC(111) Iron Surface

Melander¹,

Laasonen²,

Jónsson

2014

J. Phys. Chem. C

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show abstract

“…Surface and size effects determine the possibility of realization of homogeneous alloys of metals immiscible in the bulk state [28]. In particular, a convenient method of preparation of nanoalloys is a decomposition of multicomponent single-source precursors containing both metals [29][30][31][32][33][34]. The key advantage of this method is simultaneous reduction of both components of the alloy, thus providing formation of solid solutions in a onerun process.…”

Section: Introductionmentioning

confidence: 99%

Determination of the equilibrium miscibility gap in the Pd–Rh alloy system using metal nanopowders obtained by decomposition of coordination compounds

Shubin

Plyusnin

Коренев

2015

Journal of Alloys and Compounds

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“…To date, most studies on FePt intermetallics with tun-able crystal structures are limited to thin films, while the investigation on single-particle magnetism of FePt intermetallics is few [17][18][19][20][21][22]. Liu et al [23] first reported a systemic study on FePt intermetallic NPs prepared by a sol-gel method.…”

Section: Introductionmentioning

confidence: 99%