Preparation of Fe-50 wt.% Co nanopowders by calcination and hydrogen reduction of nitrate powders

Sung Tag Oh; Min Soo Kim; Yong Ho Choa; Ki Hyeon Kim; Sang Kwan Lee

doi:10.1016/j.mee.2011.03.144

Preparation of Fe-50 wt.% Co nanopowders by calcination and hydrogen reduction of nitrate powders

Sung Tag Oh, Min Soo Kim, Yong Ho Choa, Ki Hyeon Kim, Sang Kwan Lee

Dept. of Materials Science & Engineering

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

An optimum route to synthesize Fe-50 wt.% Co nanoparticles and their magnetic properties were investigated. The powder mixture of Fe-oxide and Co₃O₄ were prepared by calcination of Fe- and Co-nitrate powders. The hydrogen reduction behavior of calcined powders was analyzed by DTA-TG. Thermal analysis revealed that the Fe-oxides and Co₃O ₄ were hydrogen-reduced to Fe-Co alloy particles with an average size of 30 nm in the temperature range of 260-420 °C. The powder hydrogen-reduced at 600 °C showed saturation magnetization (M_s) of 204.4 emu/g and coercive force (H_c) of 96.3 Oe. However, in case of the reduced powder at 350 °C, the M_s and H_c values are changed to 120.0 emu/g and 826.8 Oe, respectively. The change of magnetic properties was explained by the formation of ferrimagnetic particles.

Original language	English
Pages (from-to)	97-99
Number of pages	3
Journal	Microelectronic Engineering
Volume	89
Issue number	1
DOIs	https://doi.org/10.1016/j.mee.2011.03.144
State	Published - Jan 2012

Keywords

Calcination of metal-nitrates
Fe-50 wt.% Co nanopowders
Hydrogen reduction
Magnetic properties

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10.1016/j.mee.2011.03.144

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@article{bf9b4a5bdb5b4f24b54cb4c7dc077807,

title = "Preparation of Fe-50 wt.\% Co nanopowders by calcination and hydrogen reduction of nitrate powders",

abstract = "An optimum route to synthesize Fe-50 wt.\% Co nanoparticles and their magnetic properties were investigated. The powder mixture of Fe-oxide and Co3O4 were prepared by calcination of Fe- and Co-nitrate powders. The hydrogen reduction behavior of calcined powders was analyzed by DTA-TG. Thermal analysis revealed that the Fe-oxides and Co3O 4 were hydrogen-reduced to Fe-Co alloy particles with an average size of 30 nm in the temperature range of 260-420 °C. The powder hydrogen-reduced at 600 °C showed saturation magnetization (Ms) of 204.4 emu/g and coercive force (Hc) of 96.3 Oe. However, in case of the reduced powder at 350 °C, the Ms and Hc values are changed to 120.0 emu/g and 826.8 Oe, respectively. The change of magnetic properties was explained by the formation of ferrimagnetic particles.",

keywords = "Calcination of metal-nitrates, Fe-50 wt.\% Co nanopowders, Hydrogen reduction, Magnetic properties",

author = "Oh, \{Sung Tag\} and Kim, \{Min Soo\} and Choa, \{Yong Ho\} and Kim, \{Ki Hyeon\} and Lee, \{Sang Kwan\}",

year = "2012",

month = jan,

doi = "10.1016/j.mee.2011.03.144",

language = "English",

volume = "89",

pages = "97--99",

journal = "Microelectronic Engineering",

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T1 - Preparation of Fe-50 wt.% Co nanopowders by calcination and hydrogen reduction of nitrate powders

AU - Oh, Sung Tag

AU - Kim, Min Soo

AU - Choa, Yong Ho

AU - Kim, Ki Hyeon

AU - Lee, Sang Kwan

PY - 2012/1

Y1 - 2012/1

N2 - An optimum route to synthesize Fe-50 wt.% Co nanoparticles and their magnetic properties were investigated. The powder mixture of Fe-oxide and Co3O4 were prepared by calcination of Fe- and Co-nitrate powders. The hydrogen reduction behavior of calcined powders was analyzed by DTA-TG. Thermal analysis revealed that the Fe-oxides and Co3O 4 were hydrogen-reduced to Fe-Co alloy particles with an average size of 30 nm in the temperature range of 260-420 °C. The powder hydrogen-reduced at 600 °C showed saturation magnetization (Ms) of 204.4 emu/g and coercive force (Hc) of 96.3 Oe. However, in case of the reduced powder at 350 °C, the Ms and Hc values are changed to 120.0 emu/g and 826.8 Oe, respectively. The change of magnetic properties was explained by the formation of ferrimagnetic particles.

AB - An optimum route to synthesize Fe-50 wt.% Co nanoparticles and their magnetic properties were investigated. The powder mixture of Fe-oxide and Co3O4 were prepared by calcination of Fe- and Co-nitrate powders. The hydrogen reduction behavior of calcined powders was analyzed by DTA-TG. Thermal analysis revealed that the Fe-oxides and Co3O 4 were hydrogen-reduced to Fe-Co alloy particles with an average size of 30 nm in the temperature range of 260-420 °C. The powder hydrogen-reduced at 600 °C showed saturation magnetization (Ms) of 204.4 emu/g and coercive force (Hc) of 96.3 Oe. However, in case of the reduced powder at 350 °C, the Ms and Hc values are changed to 120.0 emu/g and 826.8 Oe, respectively. The change of magnetic properties was explained by the formation of ferrimagnetic particles.

KW - Calcination of metal-nitrates

KW - Fe-50 wt.% Co nanopowders

KW - Hydrogen reduction

KW - Magnetic properties

UR - https://www.scopus.com/pages/publications/81855194453

U2 - 10.1016/j.mee.2011.03.144

DO - 10.1016/j.mee.2011.03.144

M3 - Article

AN - SCOPUS:81855194453

SN - 0167-9317

VL - 89

SP - 97

EP - 99

JO - Microelectronic Engineering

JF - Microelectronic Engineering

IS - 1

ER -

Preparation of Fe-50 wt.% Co nanopowders by calcination and hydrogen reduction of nitrate powders

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Keywords

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