Cobalt-substitution effects on dielectric properties of CuZn ferrites

Hsing-I Hsiang, Chi Shiung Hsi, Chi Yao Tsai, Li Then Mei

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The effects of cobalt oxide addition on the microstructure and electrical properties of CuZn ferrites were investigated. CuZn ferrites with compositions of (CuO)0.2(ZnO)0.8-x(Co2O3)x/2 (Fe2O3)0.986; x=0, 0.02, 0.04, 0.08, 0.1 were synthesized using a solid state reaction. It was observed that the addition of cobalt will change the amounts and distribution of Cu2+, Cu+, Fe2+, and Fe3+ in the grain and grain boundary. The different amounts and distribution of Cu2+, Cu+, Fe2+, and Fe3+ in the bulk and grain boundary for samples added with different amounts of cobalt oxide affected the space polarization and dielectric properties. The dielectric constant increased and reached the maximum as the x value was increased from 0 to 0.04 and then declined with further increasing the x value to 0.1. For the samples with the x value of 0.02, the substitution of Co3+ may act as a donor and simultaneously produce electrons. Fe3+ ions in the octahedral sites catch the electrons and then become Fe2+ ions, which led to the larger dielectric constant at low frequency resulting from the space charge polarization. However, as the x value increased to 0.1, the concentration of Fe2+ ions decreased, which resulted in a decrease in the amount of space charge in the grains, leading to a decrease in the dielectric constant at low frequency.

Original languageEnglish
Pages (from-to)4140-4144
Number of pages5
JournalCeramics International
Volume41
Issue number3
DOIs
Publication statusPublished - 2015 Apr 1

Fingerprint

Ferrites
Cobalt
Dielectric properties
Permittivity
Substitution reactions
Ions
Electric space charge
Grain boundaries
Polarization
Oxides
Electrons
Solid state reactions
Electric properties
Microstructure
Chemical analysis
cobalt oxide

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Hsiang, Hsing-I ; Hsi, Chi Shiung ; Tsai, Chi Yao ; Mei, Li Then. / Cobalt-substitution effects on dielectric properties of CuZn ferrites. In: Ceramics International. 2015 ; Vol. 41, No. 3. pp. 4140-4144.
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Cobalt-substitution effects on dielectric properties of CuZn ferrites. / Hsiang, Hsing-I; Hsi, Chi Shiung; Tsai, Chi Yao; Mei, Li Then.

In: Ceramics International, Vol. 41, No. 3, 01.04.2015, p. 4140-4144.

Research output: Contribution to journalArticle

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