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Varistor Beahavior in Lead Based Perovskite Comounds

Published online by Cambridge University Press:  17 March 2011

Seema Sharma and
R.N.P. Choudhary
Seema Sharma
Affiliation:
Department of Physics, A.N.College, Patna- 800013, India
R.N.P. Choudhary
Affiliation:
Department of Physics, Indian Institute of Technology, Kharagpur-721302, India
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Polycrystalline samples of Pb(Cd1/2W1/2)O3 and Pb(Mo1/2W1/2)O3 were synthesized by a high-temperature solid-state reaction technique. Preliminary crystal structure and microstructure of the compounds at room temperature were studied using X-ray diffraction (XRD) technique and Scanning electron microscopy (SEM), respectively. The dielectric permittivity (⊏) and losstangent (tan ⊏) of the compounds were obtained both as a function of frequency(103-104Hz) atroom temperature and temperature (30-3200C) at 10 kHz. Both the ac and dc conductivity have been studied over a wide range of temperature. The current– voltage (I-V) characteristics of the compound studied at different temperatures reveal that the Pb(Cd1/2W1/2)O3 also has excellent varistor behavior. A PTCR effect and NTCR effect was exhibited by Pb(Cd1/2W1/2)O3 and Pb(Cd1/2Mo1/2)O3 respectively.

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