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      https://www.ias.ac.in/article/fulltext/pram/017/04/0297-0308

    • Keywords

       

      Electrical conductivity; ferroelectric transitions, thermoelectric power; hopping mechanism; stimulated thermocurrent; impurity-vacancy jump mechanism

    • Abstract

       

      Electrical conductivity and stimulated thermocurrent (stc) studies are carried out in dicalcium lead propionate (dlp) in pure, Cu2+, Fe3+ and acetate doped single crystals over a temperature range of 303° to 503° K. Conductivity measurements on pure and doped single crystals ofdlp indicate that both propionate anions and metallic cations are responsible for the transition occurring at 333°K. Thermoelectric power measurements from 340° to 500°K indlp (pure) indicate that the transport charge carriers are electrons. A model for the conduction mechanism is proposed on the basis of hopping ofπ or resonating electrons of carboxyl groups through tunnel paths involving metal ions (Pb2+ and Ca2+). From activation energies estimated from conductivity andstc measurements, thestc peak indlp (Fe3+) occurring at 513°K is attributed to impurity vacancy jump mechanism.

    • Author Affiliations

       

      V Madhusudan1 S G Sathyanarayan1 G Sivarama Sastry1

      1. Department of Physics, Osmania University, Hyderabad - 500 007, India
    • Dates

       
  • Pramana – Journal of Physics | News

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