Structure and Magnetism of Pr1−xSrxCoO3−δ

✍ Scribed by H.W. Brinks; H. Fjellvåg; A. Kjekshus; B.C. Hauback

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 248 KB
• Volume: 147
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8384

✦ Synopsis

The structural, magnetic, and nonstoichiometric properties of the perovskite-like Pr 1؊x Sr x CoO 3؊ phase (04x40.80) have been studied by powder X-ray and neutron di4raction and magnetic susceptibility measurements between 5 and 295 K as well as by redox titration. In the compostion range 04x40.30 the structure can be described with a GdFeO 3 -type atomic arrangement (space group Pnma), while the structure in the composition range 0.30 < x40.80 involves a lower symmetry (space group P2 1 /n). Samples with 0.104x40.80 exhibit ferromagnetism below a Curie temperature of 4250 K, depending on the composition. The Pr 1؊x Sr x CoO 3؊ phase behaves as a relatively hard magnetic material. For samples prepared and cooled to room temperature in air, the oxidation state of cobalt increases linearly up to x+0.50 and stabilizes at ؉3.4 for higher substitution levels of Sr. On the basis of the present data, it is not possible to prove or disprove that there occurs charge ordering in Pr 1؊x Sr x CoO 3؊ .