Synthesis and characterization of La1+Sr2−CoMnO7− (x=0,0.2; δ=0,1)
| Autor: | T. Herranz, C. Greaves, H. El Shinawi, José F. Marco, Joke Hadermann, Frank J. Berry, B. Santos, A. Bertha |
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| Rok vydání: | 2010 |
| Předmět: |
Neutron diffraction
Space group Mineralogy chemistry.chemical_element Crystal structure Manganese engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Ruddlesden-Popper phase Crystallography Tetragonal crystal system chemistry Materials Chemistry Ceramics and Composites engineering Antiferromagnetism Physical and Theoretical Chemistry Perovskite (structure) |
| Zdroj: | Journal of Solid State Chemistry. 183:1347-1353 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2010.04.018 |
| Popis: | The n =2 Ruddlesden–Popper phases LaSr 2 CoMnO 7 and La 1.2 Sr 1.8 CoMnO 7 have been synthesized by a sol–gel method. The O6-type phases LaSr 2 CoMnO 6 and La 1.2 Sr 1.8 CoMnO 6 were produced by reduction of the O7 phases under a hydrogen atmosphere. The materials crystallize in the tetragonal I 4/ mmm space group with no evidence of long-range cation order in the neutron and electron diffraction data. Oxygen vacancies in the reduced materials are located primarily at the common apex of the double perovskite layers giving rise to square pyramidal coordination around cobalt and manganese ions. The oxidation states Co 3+ /Mn 4+ and Co 2+ /Mn 3+ predominate in the as-prepared and reduced materials, respectively. The materials are spin glasses at low temperature and the dominant magnetic interactions change from ferro- to antiferromagnetic following reduction. |
| Databáze: | OpenAIRE |
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