Bulletin of Materials Science

, Volume 33, Issue 2, pp 129–134

Impedance spectroscopy of Ba3Sr2DyTi3V7O30 ceramic

  • P. S. Sahoo
  • A. Panigrahi
  • S. K. Patri
  • R. N. P. Choudhary
Article

Abstract

Polycrystalline sample of Ba3Sr2DyTi3V7O30 was prepared at 950°C using a high-temperature solid-state reaction technique. X-ray structural analysis indicated the formation of a single-phase orthorhombic structure with lattice parameters: a = 12·2719 (39) Å, b = 8·9715(39) Å and c = 19·7812(39) Å. Microstructural study showed densely packed uniform distribution of grains over the surface of the sample. The a.c. impedance plots were used as tools to analyse the electrical response of the sample as a function of frequency at different temperatures (30–500°C). These plots revealed the presence of grain boundary effect, from 200·C onwards. Complex impedance analysis showed non-Debye type of dielectric relaxation. The Nyquist plots showed the negative temperature coefficient of resistance character of Ba3Sr2DyTi3V7O30. A hopping mechanism of electrical transport processes in the system is evident from the modulus analysis. The activation energy of the compound (calculated both from loss and modulus spectrum) is the same, and hence the relaxation process may be attributed to the same type of charge carrier.

Keywords

Ceramics X-ray diffraction dielectric properties electrical conductivity 

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Copyright information

© Indian Academy of Sciences 2010

Authors and Affiliations

  • P. S. Sahoo
    • 2
  • A. Panigrahi
    • 3
  • S. K. Patri
    • 1
  • R. N. P. Choudhary
    • 1
  1. 1.Department of Physics and MeteorologyIndian Institute of TechnologyKharagpurIndia
  2. 2.Department of PhysicsBetnoti CollegeBetnotiIndia
  3. 3.Department of PhysicsD.N. CollegeItanagarIndia

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