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Preparation and electrical and magnetic properties of Sr 2−x Na x CuO 3 (0 ≤ x ≤ 1) solid solutions
Author(s) -
Shin Y. J.,
Manova E. D.,
Dance J. M.,
Dordor P.,
Grenier J. C.,
Marquestaut E.,
Doumerc J. P.,
Pouchard M.,
Hagenmuller P.
Publication year - 1992
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19926161033
Subject(s) - seebeck coefficient , solid solution , antiferromagnetism , polaron , valence (chemistry) , magnetic susceptibility , electrical resistivity and conductivity , ion , materials science , copper oxide , electron paramagnetic resonance , copper , oxide , condensed matter physics , chemistry , analytical chemistry (journal) , crystallography , nuclear magnetic resonance , physics , electron , metallurgy , organic chemistry , quantum mechanics , chromatography
Mixed‐valence copper(II/III) oxide solid solutions Sr 2−x Na x CuO 3 (0 ≤ x ≤ 1) have been prepared by solid‐state reactions in oxygen atmosphere. All solid solutions exhibit the structure of Sr 2 CuO 3 (S.G. Immm). Electrical conductivity and thermoelectric power measurements show a semiconducting behavior in the whole composition range. The electronic structure of Sr 2 CuO 3 is compared with that of La 2 CuO 4 on the basis of an iono‐covalent model. Interpretation of transport properties suggests the formation of small polarons. Magnetic susceptibility and EPR measurements show that the antiferromagnetic ordering of Sr 2 CuO 3 tends to vanish as x increases, however magnetic interactions are still strong for a concentration of Cu 2+ ions corresponding to x = 0.8.
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