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    • Keywords


      Microwave processing; sintering; giant dielectrics; microstructure.

    • Abstract


      CaCu3Ti4O12 (CCTO) was synthesized and sintered by microwave processing at 2.45 GHz, 1.1 kW. The optimum calcination temperature using microwave heating was determined to be 950°C for 20 min to obtain cubic CCTO powders. The microwave processed powders were sintered to 94% density at 1000°C/60 min. The microstructural studies carried out on these ceramics revealed the grain size to be in the range 1–7 𝜇m. The dielectric constants for the microwave sintered (1000°C/60 min) ceramics were found to vary from 11000–7700 in the 100 Hz–100 kHz frequency range. Interestingly the dielectric loss had lower values than those sintered by conventional sintering routes and decreases with increase in frequency.

    • Author Affiliations


      P Thomas1 2 L N Sathapathy3 K Dwarakanath1 K B R Varma2

      1. Dielectric Materials Division, Central Power Research Institute, Bangalore 560 080, India
      2. Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India
      3. Ceramic Technological Institute, Bharat Heavy Electrical Limited, Bangalore 560 012, India
    • Dates

  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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