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Ionics

, Volume 24, Issue 4, pp 1161–1171 | Cite as

Impedance and modulus spectroscopic analysis of single phase BaZrO3 ceramics for SOFC application

  • Deepash Shekhar Saini
  • Shuvendu Tripathy
  • Aparabal Kumar
  • Sanjeev Kumar Sharma
  • Avijit Ghosh
  • Debasis Bhattacharya
Original Papers

Abstract

In the present work, the proton-conducting BaZrO3 (BZO) ceramics powder was synthesized by cost-effective flash pyrolysis route followed by conventional sintering. The structural analysis (crystal symmetry and unit cell parameters) of X-ray diffraction (XRD) pattern using Rietveld refinement method was investigated systematically under the influence of different temperature. The XRD results indicate that a single phase with \( Pm\overline{3}m \) space group symmetry obtained from all the calcined and sintered samples. The fractured surface of the sample sintered at 1600 °C for 8 h showed a high degree of densification with fairly large uniform grain sizes (4–6 μm) through FESEM analysis. The impedance and electric modulus spectroscopic studies of the sample were evaluated over broad temperature (250–700 °C) and frequency (1 Hz–10 MHz) ranges. Two types of relaxation signatures were distinguished from the above study, which could be associated with the contribution from grain interior and grain boundary of BZO ceramics. Furthermore, the Kohlrausch-Williams-Watts parameter (β) corresponding to grain interior (bulk) and grain boundary indicates that its deviation towards the ideal Debye behavior as the temperature increases. The total electrical conductivity of sample was detected to be 1.0 × 10−5 S cm−1 at 700 °C under 3% humidified atmospheric condition, which is one order higher magnitude than that measured in air.

Keywords

Perovskite materials Densification Impedance Electric modulus Conductivity 

Notes

Acknowledgements

The authors are thankful to Dr. Rajendra Nath Basu, Fuel Cell and Battery Division, Central Glass and Ceramic Research Institute (CGCRI) Kolkata, India for providing impedance measurement facility. Also, one of the authors Dr. Deepash Shekhar Saini gratefully thanks the MHRD, Government of India, in part of the financial support.

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Deepash Shekhar Saini
    • 1
  • Shuvendu Tripathy
    • 1
  • Aparabal Kumar
    • 1
  • Sanjeev Kumar Sharma
    • 1
  • Avijit Ghosh
    • 2
  • Debasis Bhattacharya
    • 1
  1. 1.Materials Science CentreIndian Institute of TechnologyKharagpurIndia
  2. 2.Centre for Applied PhysicsCentral University of JharkhandRanchiIndia

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