Jacob, KT and Rajitha, G and Dasgupta, N (2012) Electrical conductivity of Ca-doped YFeO3. In: INDIAN JOURNAL OF ENGINEERING AND MATERIALS SCIENCES, 19 (1). pp. 47-53.
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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-delta 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-delta 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%.
|Item Type:||Journal Article|
|Keywords:||Y1-xCaxFeO3-delta;Ca-doped yttrium ferrite;DC electrical conductivity;Seebeck coefficient;Activation energy|
|Department/Centre:||Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)|
|Date Deposited:||30 Jun 2012 07:53|
|Last Modified:||30 Jun 2012 07:53|
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