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Giant dielectric response and low dielectric loss in AlO grafted CaCuTiO ceramics

Journal of Applied Physics, ISSN: 1089-7550, Vol: 117, Issue: 9
2015
  • 28
    Citations
  • 0
    Usage
  • 23
    Captures
  • 0
    Mentions
  • 65
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    28
    • Citation Indexes
      28
  • Captures
    23
  • Social Media
    65
    • Shares, Likes & Comments
      65
      • Facebook
        65

Article Description

This study sheds light on the effect of alumina on dielectric constant and dielectric loss of novel CaCuTiO composite ceramics. Alumina, at several concentrations, was deposited on the surface of CaCuTiO particles via sol-gel technique. The dielectric constant significantly increased for all frequencies and the dielectric loss substantially decreased for low and intermediate frequencies. These observations were attributed to the change in characteristics of grains and grain boundaries. It was found that the insulating properties of the grain boundaries are improved following the addition of AlO. The relative density of CaCuTiO/AlO composite ceramics decreased compared to the pure CaCuTiO and the grain size was greatly changed with the alumina content affecting the dielectric properties. With the addition of alumina into CaCuTiO, tighter interfaces formed. The 6%- and 10%-alumina ceramics showed the minimum dielectric loss and the maximum dielectric constant, respectively. Both the dielectric constant and loss tangent decreased in the 20%-alumina ceramic due to the formation of CuO secondary phase. It was revealed that Al serves as an electron acceptor decreasing the electron concentration, if Al ions substitute for Ti ions, and as an electron donor increasing the electron concentration, if Al ions substitute for Ca ions. We established a processing-microstructure-properties paradigm which opens new avenues for novel applications of CaCuTiO/AlO composite ceramics.

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