• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2002.11a
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• pp.59-61
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• 2002

No Abstract, See Full Text

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 2002.11a
• /
• pp.78-78
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• 2002

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 1999.10a
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• pp.31-31
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• 1999

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 1999.10a
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• pp.32-32
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• 1999

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2005.04a
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• pp.37-38
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• 2005

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 1996.04a
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• pp.18-18
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• 1996

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2003.04a
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• pp.50-50
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• 2003

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09a
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• pp.482-483
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• 2006

Synthesis of iron nanopowder by room-temperature electrochemical reduction process of ${\alpha}-Fe_2O_3$ nanopowder was investigated in terms of phase evolution and microstructure. As process variables, reduction time and applied voltage were changed in the range of $1{\sim}20$ h and $30{\sim}40$ V, respectively. From XRD analyses, it was found that volume of Fe phase increased with increasing reduction time and applied voltage, respectively. The crystallite size of Fe phase in all powder samples was less than 30 nm, implying that particle growth was inhibited by the reaction at room temperature. Based on the distinct equilibrium shape of crystalline particle, phase composition of nanoparticles was identified by TEM observation.

• Journal of Powder Materials
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• v.13 no.5 s.58
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• pp.336-339
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• 2006

Magnetic properties of nanostructured materials are affected in complicated manner by their microstructure such as pain size (or particle size), internal strain and crystal structure. Thus, studies on the synthesis of nanostructured materials with controlled microstructure are necessary fur a significant improvement in magnetic properties. In the present work, nanostructured Fe-Co alloy powders with a grain size of 50 nm were successfully fabricated from the powder mixtures of (99.9% purity) $FeCl_2$ and $CoCl_2$ by chemical solution mixing and hydrogen reduction.

• Journal of Powder Materials
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• v.9 no.5
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• pp.322-328
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• 2002

Fe-Co nanocomposite powders with different composition were prepared by chemical vapor condensation (CVC) process and their characterizations were studied by means of X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. The particles having the mean size of 5~25 nm consisted of metallic cores and oxide shells. The Co contents and particle size increased with increasing the carrier gas flow rate of Co precursor. The saturation magnetization and coercivity increased with increasing Co content. and the saturation magnetization maximized at the 40 wt.%Co. The Fe-Co nanocomposite powder oxidized at $400^{\circ}C$ showed the maximum coercivity of 1739 Oe.