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Electrical Properties of Co-Doped Ceria Electrolyte Ce_{0.8-x}Gd_{0.2}Sr_{x}O_{2-δ} (0.0 ≤ x ≤ 0.1)

100%

Ramesh S., Vishnuvardhan Reddy C.

Acta Physica Polonica A

2009

vol. 115

issue 5

909-913

Effects of strontium doping on electrical properties of gadolinium-doped ceria were investigated. The Ce_{0.8-x}Gd_{0.2}Sr_{x}O_{2-δ} (0.0 ≤ x ≤ 0.1) compositions were prepared by sol-gel method and sintered at 1300°C for 8 h, the bulk densities were over 93% of theoretical density. These results were consistent with scanning electron microscope. The crystallite size of these materials was determined using the X-ray powder diffractometer and the sizes range from 19.4 nm to 24.4 nm. From the experimental results, it was observed that the composition Ce_{0.8-x}Gd_{0.2}Sr_{x}O_{2-δ} (x=0.02) exhibits higher conductivity (23.6× 10^{-3} S cm^{-1}) and minimum activation energy (0.83 eV) at 700°C. This composition is thus a potential candidate for use as electrolyte applications in intermediate temperature solid oxide fuel cells.

Elastic Properties of Double-Layered Manganite La_{1.2}Sr_{1.8-x}Ba_xMn_2O_7 (x=0.0-0.4)

61%

Reddy Y., Prashanth Kumar V., Ramesh S., Venkanna S., Ramana Reddy M., Kistaiah P., Vishnuvardhan Reddy C.

Acta Physica Polonica A

2008

vol. 113

issue 6

1687-1694

The elastic behavior of the sol-gel prepared double-layered manganite system La_{1.2}Sr_{1.8-x}Ba_xMn_2O_7 (x = 0.0-0.4) was investigated at 300 K, employing ultrasonic pulse transmission technique at 1 MHz. The values of elastic moduli and acoustic Debye temperature (θ_D) were computed from longitudinal and shear velocities. The measured values were corrected to zero porosity using Hasselman and Fulrath's formula. The elastic constants of the samples, estimated using Modi's heterogeneous metal-mixture rule, were also reported. The variation of elastic moduli with Ba concentration was interpreted in terms of strength of interatomic bonding.

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2 Acta Physica Polonica A

1 2009

1 2008

2 Ramesh S.

2 Vishnuvardhan Reddy C.

1 Kistaiah P.

1 Prashanth Kumar V.

1 Ramana Reddy M.

1 Reddy Y.

1 Venkanna S.

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Electrical Properties of Co-Doped Ceria Electrolyte Ce_{0.8-x}Gd_{0.2}Sr_{x}O_{2-δ} (0.0 ≤ x ≤ 0.1)

Elastic Properties of Double-Layered Manganite La_{1.2}Sr_{1.8-x}Ba_xMn_2O_7 (x=0.0-0.4)