Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization

S. Nikitenko; Yu Koltypin; A. Gedanken; V. Markovich; E. Rosenberg; G. Gorodetsky

doi:10.1109/intmag.2002.1001263

Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization

S. Nikitenko, Yu Koltypin, A. Gedanken, V. Markovich, E. Rosenberg, G. Gorodetsky

Department of Chemistry

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The authors have prepared coated iron nanoparticles which are air-stable by the sonochemical decomposition of Fe(CO)₅ in diphenylmethane (DPhM). The as-prepared material is superparamagnetic (M=88 emu/g at 15 kGs external field), confirming that the iron particle size is less than 10 nm, according to the published data. Air-stable dark gray magnetic powder is formed after annealing. The Mossbauer spectrum (MS) reveals that the annealed sample contains bcc Fe, iron carbide Fe₃C, and small amounts of Fe₂O₃ (∼3 at.%). The annealed material is ferromagnetic. The saturation magnetization, M_s and coercive force, H_c, are equal to 212 emu/g and 40 Oe, respectively. The high resolution TEM picture shows that iron particles are covered by a crystalline shell with a thickness of about 3 nm. The shell does not exhibit the layered structure typical for graphite. It can be assumed that the coat consists of Fe₃C or a mixture of Fe₃C and C.

Original language	English
Title of host publication	INTERMAG Europe 2002 - IEEE International Magnetics Conference
Editors	J. Fidler, B. Hillebrands, C. Ross, D. Weller, L. Folks, E. Hill, M. Vazquez Villalabeitia, J. A. Bain, Jo De Boeck, R. Wood
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	0780373650, 9780780373655
DOIs	https://doi.org/10.1109/intmag.2002.1001263
State	Published - 2002
Event	2002 IEEE International Magnetics Conference, INTERMAG Europe 2002 - Amsterdam, Netherlands Duration: 28 Apr 2002 → 2 May 2002

Publication series

Name	INTERMAG Europe 2002 - IEEE International Magnetics Conference

Conference

Conference	2002 IEEE International Magnetics Conference, INTERMAG Europe 2002
Country/Territory	Netherlands
City	Amsterdam
Period	28/04/02 → 2/05/02

Bibliographical note

Publisher Copyright:
©2002 IEEE.

Access to Document

10.1109/intmag.2002.1001263

Cite this

Nikitenko, S., Koltypin, Y., Gedanken, A., Markovich, V., Rosenberg, E., & Gorodetsky, G. (2002). Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization. In J. Fidler, B. Hillebrands, C. Ross, D. Weller, L. Folks, E. Hill, M. Vazquez Villalabeitia, J. A. Bain, J. De Boeck, & R. Wood (Eds.), INTERMAG Europe 2002 - IEEE International Magnetics Conference Article 1001263 (INTERMAG Europe 2002 - IEEE International Magnetics Conference). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/intmag.2002.1001263

Nikitenko, S. ; Koltypin, Yu ; Gedanken, A. et al. / Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization. INTERMAG Europe 2002 - IEEE International Magnetics Conference. editor / J. Fidler ; B. Hillebrands ; C. Ross ; D. Weller ; L. Folks ; E. Hill ; M. Vazquez Villalabeitia ; J. A. Bain ; Jo De Boeck ; R. Wood. Institute of Electrical and Electronics Engineers Inc., 2002. (INTERMAG Europe 2002 - IEEE International Magnetics Conference).

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title = "Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization",

abstract = "The authors have prepared coated iron nanoparticles which are air-stable by the sonochemical decomposition of Fe(CO)5 in diphenylmethane (DPhM). The as-prepared material is superparamagnetic (M=88 emu/g at 15 kGs external field), confirming that the iron particle size is less than 10 nm, according to the published data. Air-stable dark gray magnetic powder is formed after annealing. The Mossbauer spectrum (MS) reveals that the annealed sample contains bcc Fe, iron carbide Fe3C, and small amounts of Fe2O3 (∼3 at.%). The annealed material is ferromagnetic. The saturation magnetization, Ms and coercive force, Hc, are equal to 212 emu/g and 40 Oe, respectively. The high resolution TEM picture shows that iron particles are covered by a crystalline shell with a thickness of about 3 nm. The shell does not exhibit the layered structure typical for graphite. It can be assumed that the coat consists of Fe3C or a mixture of Fe3C and C.",

author = "S. Nikitenko and Yu Koltypin and A. Gedanken and V. Markovich and E. Rosenberg and G. Gorodetsky",

note = "Publisher Copyright: {\textcopyright}2002 IEEE.; 2002 IEEE International Magnetics Conference, INTERMAG Europe 2002 ; Conference date: 28-04-2002 Through 02-05-2002",

year = "2002",

doi = "10.1109/intmag.2002.1001263",

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Nikitenko, S, Koltypin, Y, Gedanken, A, Markovich, V, Rosenberg, E & Gorodetsky, G 2002, Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization. in J Fidler, B Hillebrands, C Ross, D Weller, L Folks, E Hill, M Vazquez Villalabeitia, JA Bain, J De Boeck & R Wood (eds), INTERMAG Europe 2002 - IEEE International Magnetics Conference., 1001263, INTERMAG Europe 2002 - IEEE International Magnetics Conference, Institute of Electrical and Electronics Engineers Inc., 2002 IEEE International Magnetics Conference, INTERMAG Europe 2002, Amsterdam, Netherlands, 28/04/02. https://doi.org/10.1109/intmag.2002.1001263

Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization. / Nikitenko, S.; Koltypin, Yu; Gedanken, A. et al.
INTERMAG Europe 2002 - IEEE International Magnetics Conference. ed. / J. Fidler; B. Hillebrands; C. Ross; D. Weller; L. Folks; E. Hill; M. Vazquez Villalabeitia; J. A. Bain; Jo De Boeck; R. Wood. Institute of Electrical and Electronics Engineers Inc., 2002. 1001263 (INTERMAG Europe 2002 - IEEE International Magnetics Conference).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Nikitenko, S.

AU - Koltypin, Yu

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AU - Rosenberg, E.

AU - Gorodetsky, G.

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N2 - The authors have prepared coated iron nanoparticles which are air-stable by the sonochemical decomposition of Fe(CO)5 in diphenylmethane (DPhM). The as-prepared material is superparamagnetic (M=88 emu/g at 15 kGs external field), confirming that the iron particle size is less than 10 nm, according to the published data. Air-stable dark gray magnetic powder is formed after annealing. The Mossbauer spectrum (MS) reveals that the annealed sample contains bcc Fe, iron carbide Fe3C, and small amounts of Fe2O3 (∼3 at.%). The annealed material is ferromagnetic. The saturation magnetization, Ms and coercive force, Hc, are equal to 212 emu/g and 40 Oe, respectively. The high resolution TEM picture shows that iron particles are covered by a crystalline shell with a thickness of about 3 nm. The shell does not exhibit the layered structure typical for graphite. It can be assumed that the coat consists of Fe3C or a mixture of Fe3C and C.

AB - The authors have prepared coated iron nanoparticles which are air-stable by the sonochemical decomposition of Fe(CO)5 in diphenylmethane (DPhM). The as-prepared material is superparamagnetic (M=88 emu/g at 15 kGs external field), confirming that the iron particle size is less than 10 nm, according to the published data. Air-stable dark gray magnetic powder is formed after annealing. The Mossbauer spectrum (MS) reveals that the annealed sample contains bcc Fe, iron carbide Fe3C, and small amounts of Fe2O3 (∼3 at.%). The annealed material is ferromagnetic. The saturation magnetization, Ms and coercive force, Hc, are equal to 212 emu/g and 40 Oe, respectively. The high resolution TEM picture shows that iron particles are covered by a crystalline shell with a thickness of about 3 nm. The shell does not exhibit the layered structure typical for graphite. It can be assumed that the coat consists of Fe3C or a mixture of Fe3C and C.

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A2 - Ross, C.

A2 - Weller, D.

A2 - Folks, L.

A2 - Hill, E.

A2 - Vazquez Villalabeitia, M.

A2 - Bain, J. A.

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Nikitenko S, Koltypin Y, Gedanken A, Markovich V, Rosenberg E, Gorodetsky G. Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization. In Fidler J, Hillebrands B, Ross C, Weller D, Folks L, Hill E, Vazquez Villalabeitia M, Bain JA, De Boeck J, Wood R, editors, INTERMAG Europe 2002 - IEEE International Magnetics Conference. Institute of Electrical and Electronics Engineers Inc. 2002. 1001263. (INTERMAG Europe 2002 - IEEE International Magnetics Conference). doi: 10.1109/intmag.2002.1001263

Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization

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