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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.19 [2012] >
IJEMS Vol.19(1) [February 2012] >
| Title: | Electrical conductivity of Ca-doped YFeO3 |
| Authors: | Jacob, K T
Rajitha, G
Dasgupta, N |
| Keywords: | Y1-xCaxFeO3−δ, Ca-doped yttrium ferrite
DC electrical conductivity
Seebeck coefficient
Activation energy |
| Issue Date: | Feb-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Electrical
conductivity and Seebeck coefficient of calcium-doped YFeO3, a
potential cathode material in solid oxide
fuel cells (SOFC), are measured as function of temperature and composition in
air to resolve conflicts in the literature both on the nature of conduction (n- or p-type) and the types of defects (majority and the minority)
present. Compositions of Y1-xCaxFeO3−δ with x = 0.0, 0.025, 0.05 and 0.1 are studied in the temperature range from 625 to 1250 K. All Y1-xCaxFeO3−δ
samples show p-type semiconducting behaviour. Addition of Ca up to 5% dramatically increases the conductivity of
YFeO3; increase is more gradual up to 10%. A second phase Ca2Fe2O5
appears in the microstructure for Ca concentrations in excess of 11%.
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| Page(s): | 47-53 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.19(1) [February 2012]
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