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Journal of Materials Science

, Volume 42, Issue 15, pp 6252–6259 | Cite as

Dielectric and impedance study of lead-free ceramic: (Na0.5Bi0.5)ZrO3

  • Lily
  • K. Kumari
  • K. PrasadEmail author
  • K. L. Yadav
Article

Abstract

Polycrystalline sample of (Na0.5Bi0.5)ZrO3 was prepared using a high-temperature solid-state reaction technique. XRD analysis indicated the formation of a single-phase orthorhombic structure. Dielectric study revealed the diffuse phase transition at 425 °C. AC impedance plots were used as tools to analyse the electrical behaviour of the sample as a function of frequency at different temperatures. The ac impedance studies revealed the presence of grain boundary effect at and above 350 °C. Complex impedance analysis indicated non-Debye type dielectric relaxation and negative temperature coefficient of resistance (NTCR) character of (Na0.5Bi0.5)ZrO3. AC conductivity data were used to evaluate the density of states at Fermi level and activation energy of the compound. DC electrical and thermal conductivities of grain and grain boundary have been assessed.

Keywords

Complex Impedance Cole Plot Diffuse Phase Transition Total Thermal Conductivity Bismuth Titanate 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Materials Research Laboratory, University Department of PhysicsT. M. Bhagalpur UniversityBhagalpurIndia
  2. 2.Department of PhysicsIndian Institute of TechnologyRoorkeeIndia

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