Phase transition at ambient pressure in complex oxide Sr3ScCoO6+δ. Morphotropic row Sr3ScMO7-δ (M = Ni–Cr)
| Autor: | T. I. Chupakhina, L.B. Vedmid, Yu.A. Deeva, Dina G. Kellerman, Inna V. Baklanova |
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| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Materials science Spin states Transition temperature Oxide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Magnetic susceptibility 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography Paramagnetism chemistry.chemical_compound Differential scanning calorimetry chemistry Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry 0210 nano-technology Cobalt |
| Zdroj: | Journal of Solid State Chemistry. 300:122265 |
| ISSN: | 0022-4596 |
| Popis: | A phase transition from a quasi-one-dimensional hexagonal structure (1D) to a two-dimensional layered structure (2D) of the second homolog of the Ruddlesden-Popper series was detected in the Sr3ScCoO6+δ complex oxide. The transition is unique since it occurs when the temperature increases without the use of high pressures and changes in the oxygen partial pressure. Using high-temperature X-ray diffraction and differential scanning calorimetry in situ, a transition temperature range 1296 K–1433 K was established. It is shown that in the quasi-one-dimensional phase the scandium and cobalt cations are ordered by prismatic and octahedral positions, while in the two-dimensional perovskite-like oxide they are statistically distributed by octahedral positions. Sr3ScCoO6+δ is the only compound in the Sr3ScMO7-δ (M = Ni - Cr) morphotropic series, which exists in two structural types. The 1D → 2D transformation is associated with the ability of cobalt to be in various combinations of oxidation states and spin states. The temperature dependence of the magnetic susceptibility of oxides of both types of structure in the Sr3ScMO7-δ (M = Ni - Cr) series is paramagnetic due to magnetic dilution with Sc ion. The tetragonal modification of Sr3ScCoO6+δ has a significantly larger magnetic moment compared to the hexagonal one. |
| Databáze: | OpenAIRE |
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