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KMID : 1059519890330050445
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Journal of the Korean Chemical Society
1989 Volume.33 No. 5 p.445 ~ p.451
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Nonstoichiometry and Electrical Properties of the Er1-xSrxFeO3-y Systems
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Yo Chul-Hyun
Jung Sung-Tae
Pyon Woong-Bum
Lee Seung-Hyun
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Abstract
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A series of solid solutions with formula Er1-xSrxFeO3-y, where ⅹ is from 0.0 to 1.0, has been synthesized by heating at 1200℃ for 24 hours. X-ray diffraction shows these samples to be orthorhombically distorted perovskites for compositions up to x = 0. 6 and apparantly simple cubic perovskite structures from 0.8≤x≤1.0. Lattice volumes are increased with the introduction of Sr. The mixed valence state of two kinds of Fe ion in these ferrite systems is analyzed by the Mohr salt titration method. Mossbauer spectra measured at room temperature for x = 0.0 and 0.5 compositions shows hyperfine splitting for iron (Ⅲ) due to magnetic ordering and indicates that these samples contain octahedrally and tetrahedrally coordinated iron sites. Electrical conductivity measurements indicate that conduction in these samples apparantly occurs over the octahedral sites by a hopping mechanism.
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