ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
La1-xCaxCrO3 (0.1≤ x ≤ 0.4) is usually used as interconnect material for solid oxide fuel cells(SOFCs). In this paper, composite material, the two-phase mixtures of face-centered cubic fluoritestructure CayCe1-yO2-y (0 ≤ y≤ 0.2) and orthorhombic perovskite structure [Sm(Eu,Gd)]1-zCazCrO3 (0 〈 z 〈0.3), was prepared by an auto-ignition process in which mixed rare earth oxides (Sm2O3, Gd2O3, Eu2O3and CeO2) are substituted for La2O3 in La1-xCaxCrO3. The direct current (DC) four-probe techniquemeasurement indicated that the electrical conductivities of specimens increased along with the increase ofCa2+ content (x), especially when x=0.3 and 0.4. The material (x=0.4, about 94% relative density) showedexcellent electrical conductivities of 48 Scm-1 in air and 13 Scm-1 in H2 (purity 99.999%) at 700°Crespectively, which is about 3 times as high as that of La0.7Ca0.3CrO3
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.448.pdf
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