Barrier Layer Formation and PTCR Effect in (1 − x) [Pb(Fe_1/2Nb_1/2)O₃]-xPbTiO₃(x= 0.13) Ceramics

Satendra Pal Singh School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India

Akhilesh Kumar Singh School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India

Dhananjai Pandey School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India

(1 − x)Pb(Fe_1/2Nb_1/2)O₃-xPbTiO₃ (PFN-xPT) ceramics with x = 0.13 sintered at 1200°C show diffuse phase transition and very high dielectric constant at lower frequencies. The high value of dielectric constant at lower frequencies is shown to be due to the barrier layer formation. The resistivity of the PFN-xPT ceramics, obtained by complex impedance analysis, initially decreases with temperature and then shows an upward trend beyond the ferroelectric Curie point reminiscent of BaTiO₃ based thermistors with PTCR effect.

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Acknowledgment

It is a pleasure to acknowledge the interactions with Professor D. Kumar, Professor Om Parkash and Dr. H. Sharma.

Paper originally presented at AMF-4, Bangalore, India, December 12–15, 2003

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Barrier Layer Formation and PTCR Effect in (1 − x) [Pb(Fe_1/2Nb_1/2)O₃]-xPbTiO₃(x= 0.13) Ceramics

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Barrier Layer Formation and PTCR Effect in (1 − x) [Pb(Fe_1/2Nb_1/2)O₃]-xPbTiO₃(x= 0.13) Ceramics