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  Physics Express 2012, 2: 19
  Research Article
Frequency-Temperature dependence of Dy doped Ba(Zr0.25Ti0.75)O3 Ceramic: Impedance and modulus spectroscopy
  T.Badapandaa, V.Senthila, S.K.Routb, S.Panigrahia, T.P. Sinhac  
a Department of Physics, National Institute of Technology, Rourkela-769008, India
b Department of Applied Physics, Birla Institute of Technology, Mesra, Ranchi-835215, India
c Department of Physics, Bose Institute, Kolkata-700009, India

  In this work, we report the impedance and modulus spectroscopy of polycrystalline Ba1-xDy2x/3Zr0.25Ti0.75O3 (x=0.05) (BDZT) ceramic prepared by solid state reaction route. This ceramic was structurally characterized by X-ray diffraction (XRD) pattern which revealed that the ceramic shows a cubic structure. Impedance and modulus spectroscopy of the BDZT ceramic are investigated in the temperature range 340–400°C. Impedance spectroscopy shows a non-Debye type relaxation and relaxation frequency shifts to higher frequency with increase in temperature. A significant shift in impedance loss peaks toward higher frequency indicates conduction in material and favoring the long range motion of mobile charge carriers. The Nyquist plot shows two semicircles, ascribed to grain and grain boundary effect of BDZT ceramic. The frequency dependent AC conductivity at different temperatures indicates that the conduction process is thermally activated and the spectra follow the universal power law. The hopping frequency shifts toward higher frequency with increase in temperature, below which the conductivity is frequency independent. The variation of DC conductivity confirms that the BDZT ceramic exhibits negative temperature coefficient of resistance behavior in high temperature.
  Ceramics; Electrical properties; Thermal conductivity; AC conductivity  

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