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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Structure and electrical properties of La
1-x
Sr
x
Co
1-y
Fe
y
O
3
. Part 1. The system La
0.8
Sr
0.2
Co
1-y
Fe
y
O
3
Solid State Ionics, Volume 76, No. 3-4, Year 1995
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Description
Crystal structure, thermal expansion, thermogravimetry, thermoelectricity, and electrical conductivity of compositions in the system La0.8Sr0.2Co1-yFeyO3 with 0 ≤ y ≤ 1 were studied as function of Co Fe ratio and temperature, in air. The electrical conduction mechanism is attributed to the adiabatic-hopping of p-type small polarons. At high temperatures, oxygen deficiency causes lattice expansion and a reduction in electrical conductivity. The observed temperature dependence of the Seebeck coefficient is attributed to changes in carrier concentration caused by a thermally excited charge disproportionation of Co3+ ions and by the ionic compensation of induced oxygen vacancies. The measured electrical conductivity and Seebeck coefficient as a function of the Co Fe ratio is interpreted using a two-site hopping and the site-percolation model. It is suggested that a preferential electronic compensation of Fe ions over Co ions may occur in this system. © 1995.
Authors & Co-Authors
Tai, Lone Wen F.
United States, Detroit
General Motors
Nasrallah, Magdi M.
Egypt, Cairo
Faculty of Engineering
Anderson, Harlan U.
United States, Rolla
Missouri University of Science and Technology
Sparlin, Don M.
United States, Rolla
Missouri University of Science and Technology
Sehlin, S. R.
United States, Rolla
Missouri University of Science and Technology
Statistics
Citations: 708
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1016/0167-2738(94)00244-M
ISSN:
01672738
Research Areas
Environmental