• M Raghavender

      Articles written in Pramana – Journal of Physics

    • A-site substitution-controlled dielectric dispersion in lead-free sodium bismuth titanate

      M Raghavender G S Kumar G Prasad

      More Details Abstract Fulltext PDF

      Effect of doping in Na0.5Bi0.5Ti$_{O3}$ (NBT) with Ce3+ and Sm3+ at the A-site on dielectric behaviour, impedance and conductivity is being reported. Na0.5Bi$_{0.5−x}𝐴_{x}$TiO3 samples (A being Ce and Sm) are studied with varying values of 𝑥. For Na0.5Bi$_{0.5−x}$Ce$_{x}$TiO3 samples 𝑥 is 0.001, 0.005 and 0.007 and for Na0.5Bi$_{0.5−x}$Sm$_{x}$TiO3 samples 𝑥 is 0.05, 0.1 and 0.15. Dielectric constant and loss are studied in the frequency range 10 kHz to 1 MHz and in the temperature range $30–650^{\circ}$C. Impedance and electric modulus studies are undertaken. The relaxations observed in the samples are non-Debye and activation energies for relaxation and conduction are evaluated.

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