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Title: Electrical conductivity of Ca-doped YFeO<sub>3</sub>
Authors: Jacob, K T
Rajitha, G
Dasgupta, N
Keywords: <span style="font-size:11.0pt;font-family: "Times New Roman","serif";mso-fareast-font-family:"Times New Roman";mso-bidi-font-family: Mangal;mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language: HI" lang="EN-GB">Y<sub>1-<i style="mso-bidi-font-style:normal">x</i></sub>Ca<i style="mso-bidi-font-style:normal"><sub>x</sub></i>FeO<sub>3−<i style="mso-bidi-font-style:normal">δ</i></sub>, Ca-doped yttrium ferrite</span>
DC electrical conductivity
Seebeck coefficient
Activation energy
Issue Date: Feb-2012
Publisher: NISCAIR-CSIR, India
Abstract: Electrical conductivity and Seebeck coefficient of calcium-doped YFeO<sub>3</sub>, 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 (<i style="mso-bidi-font-style:normal">n</i>- or <i style="mso-bidi-font-style: normal">p</i>-type) and the types of defects (majority and the minority) present. Compositions of Y<sub>1-<i style="mso-bidi-font-style:normal">x</i></sub>Ca<i style="mso-bidi-font-style:normal"><sub>x</sub></i>FeO<sub>3−<i style="mso-bidi-font-style:normal">δ</i></sub> with <i style="mso-bidi-font-style: normal">x</i> = 0.0, 0.025, 0.05 and 0.1 are studied in <span style="mso-bidi-font-style: italic">the temperature range from 625 to 1250 K. All Y<sub>1-<i style="mso-bidi-font-style:normal">x</i></sub>Ca<i style="mso-bidi-font-style: normal"><sub>x</sub></i>FeO<sub>3−<i style="mso-bidi-font-style:normal">δ</i></sub> samples show <i>p</i>-type semiconducting behaviour. <span style="mso-bidi-font-style: italic">Addition of Ca up to 5% dramatically increases the conductivity of YFeO<sub>3</sub>; increase is more gradual up to 10%. A second phase Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> appears in the microstructure for Ca concentrations in excess of 11%. </span></span>
Description: 47-53
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.19(1) [February 2012]

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