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    • Keywords


      Perovskite; resistivity; Seebeck coefficient; hopping; lanthanum lead cobalt titanium oxide

    • Abstract


      Measurements of DC electrical resistivity and Seebeck coefficient on the perovskite system La1−xPbxδ Co1−xTixO3−δ for 0·2≤x≤0·9 have been made in the temperature range 300–800 K. AC conductivity,σa.c, of all the samples were measured as a function of temperature (300–573 K) and frequency (1 kHz-1 MHz). DC resistivity behaviour of all the samples is similar. However, the resistivity value, which varies over 5–6 orders of magnitude, depends on both the compositionx and the structure of the samples. All the samples exhibitp-type electronic conduction. The value of Seebeck coefficient,α, for samples withx≤0·5 initially increases with temperature up to a particular temperature. Above this temperature, the behaviour ofα for samples withx≤0·5 and for samples withx>0·5 over the entire temperature range is similar to that of La CoO3. All the samples exhibit frequency-dependent a.c. conductivity at low temperatures.

    • Author Affiliations


      Devendra Kumar1 2 Ch Durga Prasad1 Om Parkash1

      1. School of Materials Science and Technology, Banaras Hindu University, Varanasi - 221 005, India
      2. Department of Ceramic Engineering, Institute of Technology, Banaras Hindu University, Varanasi - 221 005, India
    • Dates

  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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