Low-temperature XRD and Mössbauer spectroscopy studies of CuFeO2 delafossite with dominance of the hexagonal polymorph
Artykuł w czasopiśmie
MNiSW
100
Lista 2024
| Status: | |
| Autorzy: | Siedliska Karolina, Pikula Tomasz, Panek Rafał, Sačer Petar, Gondek Łukasz, Barišić Neven, Komędera Kamila |
| Dyscypliny: | |
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| Rok wydania: | 2026 |
| Wersja dokumentu: | Elektroniczna |
| Język: | angielski |
| Wolumen/Tom: | 655 |
| Numer artykułu: | 174422 |
| Strony: | 1 - 9 |
| Impact Factor: | 3,0 |
| Efekt badań statutowych | NIE |
| Finansowanie: | The research leading to these results was funded within the framework of the pro-quality program of Lublin University of Technology “Grants for grants” (Grant no. 9/GnG/2023). We also acknowledge financial support from the National Science Center, Poland (Grants No. 2021/41/B/ST3/03454). Furthermore, the research was co-funded by resources from the “Mobility Program – Inbound mobility of senior research assistants” (Croatian Science Foundation HRZZ; MOBDOL-2023-12-3850). The work at the University of Zagreb was supported by the Croatian Science Foundation under Project No. IP-2022-10-3382 and by the CeNIKS project, co-financed by the Croatian Government and the European Union through the European Regional Development Fund Competitiveness and Cohesion Operational Program (Grant No. KK.01.1.1.02.0013). This research was also partially funded by the Austrian Science Fund (FWF) [10.55776/F86; 10.55776/P35945]. |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| The structural and hyperfine interaction parameters of CuFeO2 delafossite, dominated by the hexagonal polymorph, were investigated over a broad temperature range. The sample was synthesized via a low-temperature hydrothermal method. Room-temperature measurements revealed a material composition of 78.1% 2H and 18.3% 3R polymorphs, with traces of α-Fe2O3. Temperature-dependent powder X-ray diffraction analysis from 13 to 1100 K shows distinct lattice behaviors: the 3R c-lattice parameter remains nearly constant between 20 and 300 K, while the 2H phase displays an unusual non-monotonic c(T) showing a broad maximum between 50 and 100 K and a subtle discontinuity at 15–16 K, which suggests the onset of magnetic ordering. High-temperature measurements indicate that the lattice of both polymorphs, 2H and 3R, starts to change around 540 K, and decomposes into Fe3-xCuxO4-like and CuO phases near 680 K. Scanning electron microscopy images confirm the presence of agglomerated platelet-shaped crystallites, with an aspect ratio of about 10:1. 57Fe M¨ossbauer spectroscopy (4–300 K) shows a pristine Fe3+ doublet (IS = 0.385 mm/s, QS = 0.627 mm/s) in the paramagnetic state, a partially disordered (PD) phase onset around 20 K, and the development of long-range order below 16 K with an average hyperfine field of 50.6 T at 4 K. The PD boundary correlates with the XRD c-axis anomaly, indicating hexagonal stacking-modulated spin-lattice coupling. |
