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<strong>Impedance and Electric Modulus Spectroscopy of Polycrystalline La<sub>0.5</sub>Sr<sub>0.5</sub>Bi<sub>0.2</sub>Co<sub>0</sub>.<sub>4</sub>Fe<sub>0.4</sub>O<sub>3–</sub><sub>d</sub> Cathode Ceramic for Intermediate Temperature SOFCs</strong>

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Title Statement <strong>Impedance and Electric Modulus Spectroscopy of Polycrystalline La<sub>0.5</sub>Sr<sub>0.5</sub>Bi<sub>0.2</sub>Co<sub>0</sub>.<sub>4</sub>Fe<sub>0.4</sub>O<sub>3–</sub><sub>d</sub> Cathode Ceramic for Intermediate Temperature SOFCs</strong>
 
Added Entry - Uncontrolled Name Singh, Sunder
Kumar, Manindra
Kumar, Anil
Saini, Deepash Shekhar; D. D. U. Gorakhpur University
UGC-India
 
Uncontrolled Index Term Experimental Condensed Matter Physics
Cathode materials; Grain boundary; Porous; Impedance; Electric modulus; Jonscher’s double power law
 
Summary, etc. <p>In the present research work, La<sub>0.5</sub>Sr<sub>0.5</sub>Bi<sub>0.2</sub>Co<sub>0</sub>.<sub>4</sub>Fe<sub>0.4</sub>O<sub>3–</sub><sub>d</sub> cathode ceramic powder is synthesized through cost-effective flash pyrolysis process and further conventional heat treatment for sintering for IT-SOFCs. The crystal structure, unit cell parameters and bond length are determined by using the Rietveld refinement program. The XRD result indicates existence of a pure single phase with <em>R</em> <em>C</em> space group symmetry detected from the sample which has been sintered at 700 ℃. SEM images of fracture surface of sample sintered at 700 ℃ showed a high porosity and nano grain sizes (50-100 nm). Impedance and electric modulus spectroscopic methods are used to identify the relaxation phenomena in La<sub>0.5</sub>Sr<sub>0.5</sub>Bi<sub>0.2</sub>Co<sub>0</sub>.<sub>4</sub>Fe<sub>0.4</sub>O<sub>3–</sub><sub>d</sub> ceramic over a broad range of temperature and frequency. A single relaxation peak is observed in the imaginary part of impedance and electric modulus spectra, which could be due to the contribution of grain boundary of La<sub>0.5</sub>Sr<sub>0.5</sub>Bi<sub>0.2</sub>Co<sub>0</sub>.<sub>4</sub>Fe<sub>0.4</sub>O<sub>3–</sub><sub>d</sub><sub> </sub>ceramic. The imaginary part of modulus ( ) spectra is analyzed with help of non-exponential decay function or Kohlrausch–Williams–Watts (KWW) parameter (<em>β</em>). In the combined plot of the imaginary part of impedance and electric modulus spectra at 210 ℃, only a single peak of  and  is observed at the same frequency which indicates that the conduction process is a long-range motion of the charge carriers. The frequency-dependent conductivity is followed by the Jonscher’s double power law in the temperature range 30-210 ℃.</p>
 
Publication, Distribution, Etc. Indian Journal of Pure & Applied Physics (IJPAP)
2021-08-12 16:06:12
 
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Data Source Entry Indian Journal of Pure & Applied Physics (IJPAP); ##issue.vol## 59, ##issue.no## 8 (2021): Indian Journal of Pure & Applied Physics
 
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