Homogeneous grain growth and fast-firing of chemically modified nanocrystalline MnZn ferrites

Yong Soo Cho, Deborah Schaffer, Vernon L. Burdick, Vasantha R.W. Amarakoon

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A chemical method utilizing sol-gel reactions was investigated to uniformly incorporate small amounts of additives of Si and Ca into nanocrystalline Mn0.6Zn0.4Fe2O4 powders (≈ 14 nm particle size). Sintering behavior of the chemically modified nanocrystalline MnZn ferrites was studied with regard to the effects of the chemical additives and sintering conditions on densification and grain growth. The nanopowder samples without the additives exhibited abnormal grain growth regardless of heating rate after pressing at a relatively low pressure and sintering at 1200°C, while the chemical addition of 2 wt% SiO2 and 0.5 wt% CaO was found to improve microstructural characteristics, i.e., homogeneous grain growth and less porosity. Fast-firing did not seem to favorably affect densification of the chemically modified MnZn ferrite nanopowder, but was found to contribute to the suppression of grain growth in the nanocrystalline ferrite compacts.

Original languageEnglish
Pages (from-to)2361-2368
Number of pages8
JournalMaterials Research Bulletin
Volume34
Issue number14
DOIs
Publication statusPublished - 1999 Jan 1

Fingerprint

Ferrites
Grain growth
ferrites
sintering
Sintering
densification
Densification
Ferrite
Nanocrystalline powders
pressing
Heating rate
Sol-gel process
low pressure
Porosity
Particle size
retarding
gels
porosity
heating

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Cho, Yong Soo ; Schaffer, Deborah ; Burdick, Vernon L. ; Amarakoon, Vasantha R.W. / Homogeneous grain growth and fast-firing of chemically modified nanocrystalline MnZn ferrites. In: Materials Research Bulletin. 1999 ; Vol. 34, No. 14. pp. 2361-2368.
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Homogeneous grain growth and fast-firing of chemically modified nanocrystalline MnZn ferrites. / Cho, Yong Soo; Schaffer, Deborah; Burdick, Vernon L.; Amarakoon, Vasantha R.W.

In: Materials Research Bulletin, Vol. 34, No. 14, 01.01.1999, p. 2361-2368.

Research output: Contribution to journalArticle

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T1 - Homogeneous grain growth and fast-firing of chemically modified nanocrystalline MnZn ferrites

AU - Cho, Yong Soo

AU - Schaffer, Deborah

AU - Burdick, Vernon L.

AU - Amarakoon, Vasantha R.W.

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AB - A chemical method utilizing sol-gel reactions was investigated to uniformly incorporate small amounts of additives of Si and Ca into nanocrystalline Mn0.6Zn0.4Fe2O4 powders (≈ 14 nm particle size). Sintering behavior of the chemically modified nanocrystalline MnZn ferrites was studied with regard to the effects of the chemical additives and sintering conditions on densification and grain growth. The nanopowder samples without the additives exhibited abnormal grain growth regardless of heating rate after pressing at a relatively low pressure and sintering at 1200°C, while the chemical addition of 2 wt% SiO2 and 0.5 wt% CaO was found to improve microstructural characteristics, i.e., homogeneous grain growth and less porosity. Fast-firing did not seem to favorably affect densification of the chemically modified MnZn ferrite nanopowder, but was found to contribute to the suppression of grain growth in the nanocrystalline ferrite compacts.

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