Interplay of valence states and magnetic interactions in the perovskite system LaNi1–xRhxO3
| Autor: | Ø. Slagtern Fjellvåg, A. Slagtern Fjellvåg, A. Olafsen Sjåstad, Susmit Kumar, Amund Ruud |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Valence (chemistry) Absorption spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Synchrotron 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention Inorganic Chemistry Crystallography Ferromagnetism Oxidation state law Phase (matter) Materials Chemistry Ceramics and Composites Antiferromagnetism Physical and Theoretical Chemistry 0210 nano-technology Perovskite (structure) |
| Zdroj: | Journal of Solid State Chemistry |
| ISSN: | 0022-4596 |
| Popis: | We report on the structural, magnetic and electronic properties of Rh substituted LaNiO3, LaNi1–xRhxO3 (0 ≤ x ≤ 1). Increased Rh contents are associated with increased structural distortion, and we observe a phase transformation and an immiscibility gap between 0.15 ≤ x ≤ 0.25, separating the R-3c and Pnma perovskite structure regimes. Structural evaluation by synchrotron X-ray diffraction, X-ray absorption spectroscopy and DC magnetic measurements suggest variations in oxidation state for the B-site cations, with Ni(II)/Rh(IV), in addition to Rh(III), dominating for high Rh-contents. Although ordering of Ni(II)/Rh(IV) is possible, no B-site ordering between Ni and Rh is observed for any composition. A metal-to-insulator transition occurs upon Rh-substitution, correlating with the structural transition. DC- and AC magnetic measurements reveal that several of the compositions are magnetically frustrated with both antiferro- and ferromagnetic behaviour at low temperatures. The antiferromagnetic interactions are dominating, while the ferromagnetic interactions increase with increasing Rh-content, to a maximum at x = 0.80 and x = 0.90 in LaNi1–xRhxO3. The mixed valence states are assumed to contribute with a ferromagnetic super-exchange interaction between Ni(II) and Rh(IV). |
| Databáze: | OpenAIRE |
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