Hydrothermal preparation of high saturation magnetization and coercivity cobalt ferrite nanocrystals without subsequent calcination

S. C. Goh, Chin Hua Chia, Sarani Zakaria, M. Yusoff, C. Y. Haw, Sh Ahmadi, N. M. Huang, H. N. Lim

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

In this work, CoFe2O4 nanocrystals with high saturation magnetization (Ms) and high coercivity (Hc) have been fabricated via a simple hydrothermal method and without subsequent calcination. The resulting CoFe2O4 nanocrystals are characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectrometry, differential scanning calorimetry and vibrating sample magnetometry. The results indicate that CoFe2O4 nanocrystals are single crystal and the average crystallite size is increasing with the hydrothermal temperature. The electron micrographs show that the nanocrystals are well-dispersed and possess uniform size. The shape of CoFe2O4 nanocrystals is transformed from spherical into rod by increasing the hydrothermal temperature. The nanocrystals show relatively high Ms of 74.8 emu g-1 and Hc of 2216 Oe, as compared to previous reported results. The obtained results reveal the applicability of this method for efficiently producing well crystallized and relatively high magnetic properties CoFe2O4 nanocrystals as compared to other methods. More importantly, it does not require further calcination processes.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalMaterials Chemistry and Physics
Volume120
Issue number1
DOIs
Publication statusPublished - 15 Mar 2010

Fingerprint

Saturation magnetization
Coercive force
Calcination
roasting
Nanocrystals
coercivity
Ferrite
ferrites
Cobalt
nanocrystals
cobalt
saturation
magnetization
preparation
Crystallite size
cobalt ferrite
x ray spectroscopy
magnetic measurement
Differential scanning calorimetry
Magnetic properties

Keywords

  • Chemical synthesis
  • Magnetic materials
  • Magnetic properties
  • Nanostructures

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Hydrothermal preparation of high saturation magnetization and coercivity cobalt ferrite nanocrystals without subsequent calcination. / Goh, S. C.; Chia, Chin Hua; Zakaria, Sarani; Yusoff, M.; Haw, C. Y.; Ahmadi, Sh; Huang, N. M.; Lim, H. N.

In: Materials Chemistry and Physics, Vol. 120, No. 1, 15.03.2010, p. 31-35.

Research output: Contribution to journalArticle

@article{e206161086f744e1a2d328a8f1c5f40c,
title = "Hydrothermal preparation of high saturation magnetization and coercivity cobalt ferrite nanocrystals without subsequent calcination",
abstract = "In this work, CoFe2O4 nanocrystals with high saturation magnetization (Ms) and high coercivity (Hc) have been fabricated via a simple hydrothermal method and without subsequent calcination. The resulting CoFe2O4 nanocrystals are characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectrometry, differential scanning calorimetry and vibrating sample magnetometry. The results indicate that CoFe2O4 nanocrystals are single crystal and the average crystallite size is increasing with the hydrothermal temperature. The electron micrographs show that the nanocrystals are well-dispersed and possess uniform size. The shape of CoFe2O4 nanocrystals is transformed from spherical into rod by increasing the hydrothermal temperature. The nanocrystals show relatively high Ms of 74.8 emu g-1 and Hc of 2216 Oe, as compared to previous reported results. The obtained results reveal the applicability of this method for efficiently producing well crystallized and relatively high magnetic properties CoFe2O4 nanocrystals as compared to other methods. More importantly, it does not require further calcination processes.",
keywords = "Chemical synthesis, Magnetic materials, Magnetic properties, Nanostructures",
author = "Goh, {S. C.} and Chia, {Chin Hua} and Sarani Zakaria and M. Yusoff and Haw, {C. Y.} and Sh Ahmadi and Huang, {N. M.} and Lim, {H. N.}",
year = "2010",
month = "3",
day = "15",
doi = "10.1016/j.matchemphys.2009.10.016",
language = "English",
volume = "120",
pages = "31--35",
journal = "Materials Chemistry and Physics",
issn = "0254-0584",
publisher = "Elsevier BV",
number = "1",

}

TY - JOUR

T1 - Hydrothermal preparation of high saturation magnetization and coercivity cobalt ferrite nanocrystals without subsequent calcination

AU - Goh, S. C.

AU - Chia, Chin Hua

AU - Zakaria, Sarani

AU - Yusoff, M.

AU - Haw, C. Y.

AU - Ahmadi, Sh

AU - Huang, N. M.

AU - Lim, H. N.

PY - 2010/3/15

Y1 - 2010/3/15

N2 - In this work, CoFe2O4 nanocrystals with high saturation magnetization (Ms) and high coercivity (Hc) have been fabricated via a simple hydrothermal method and without subsequent calcination. The resulting CoFe2O4 nanocrystals are characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectrometry, differential scanning calorimetry and vibrating sample magnetometry. The results indicate that CoFe2O4 nanocrystals are single crystal and the average crystallite size is increasing with the hydrothermal temperature. The electron micrographs show that the nanocrystals are well-dispersed and possess uniform size. The shape of CoFe2O4 nanocrystals is transformed from spherical into rod by increasing the hydrothermal temperature. The nanocrystals show relatively high Ms of 74.8 emu g-1 and Hc of 2216 Oe, as compared to previous reported results. The obtained results reveal the applicability of this method for efficiently producing well crystallized and relatively high magnetic properties CoFe2O4 nanocrystals as compared to other methods. More importantly, it does not require further calcination processes.

AB - In this work, CoFe2O4 nanocrystals with high saturation magnetization (Ms) and high coercivity (Hc) have been fabricated via a simple hydrothermal method and without subsequent calcination. The resulting CoFe2O4 nanocrystals are characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectrometry, differential scanning calorimetry and vibrating sample magnetometry. The results indicate that CoFe2O4 nanocrystals are single crystal and the average crystallite size is increasing with the hydrothermal temperature. The electron micrographs show that the nanocrystals are well-dispersed and possess uniform size. The shape of CoFe2O4 nanocrystals is transformed from spherical into rod by increasing the hydrothermal temperature. The nanocrystals show relatively high Ms of 74.8 emu g-1 and Hc of 2216 Oe, as compared to previous reported results. The obtained results reveal the applicability of this method for efficiently producing well crystallized and relatively high magnetic properties CoFe2O4 nanocrystals as compared to other methods. More importantly, it does not require further calcination processes.

KW - Chemical synthesis

KW - Magnetic materials

KW - Magnetic properties

KW - Nanostructures

UR - http://www.scopus.com/inward/record.url?scp=74149084875&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=74149084875&partnerID=8YFLogxK

U2 - 10.1016/j.matchemphys.2009.10.016

DO - 10.1016/j.matchemphys.2009.10.016

M3 - Article

AN - SCOPUS:74149084875

VL - 120

SP - 31

EP - 35

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

SN - 0254-0584

IS - 1

ER -