PORTO @ 
Archivio Istituzionale della Ricerca
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishMetal-ceramic nanocomposites containing nominal 15% wt. Ni were produced by a smart, scalable process involving a suitable thermal treatment of Ni-exchanged zeolite precursors, and were investigated by dc magnetic techniques between 2 and 300 K. Two main magnetic phases were detected in all studied materials: globular magnetic nanoparticles with average diameters in the 10–20 nm range, and Ni²⁺ ions embedded in the host ceramic matrix. The blocking temperature of Ni⁰ nanoparticles is well above room temperature. The magnetic signal from nanoparticles dominates at high temperature; however, a clear paramagnetic signal from Ni²⁺ ions emerges when the temperature is decreased. The magnetic moment per Ni ion is in agreement with typical values found in Ni-containing zeolites. Magnetic susceptibility and FC/ZFC curves point to the existence of a weak interaction among Ni²⁺ ions (Néel temperature TN < 15 K) which results in the formation of ferrimagnetic-like clusters below about 30 K. In each cluster, the individual magnetic moments respond in a collective way with blocking temperatures less than 5 K.
Magnetic clustering of Ni2+ ions in metal-ceramic nanocomposites obtained from Ni-exchanged zeolite precursors / Barrera, Giancarlo; Tiberto, P.; Esposito, S.; Marocco, A.; Bonelli, B.; Pansini, Michele; Manzoli, M.; Allia, P.. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - 44:14(2018), pp. 17240-17250. [10.1016/j.ceramint.2018.06.182]
| Titolo: | Magnetic clustering of Ni2+ ions in metal-ceramic nanocomposites obtained from Ni-exchanged zeolite precursors | |
| Autori: | ||
| Data di pubblicazione: | 2018 | |
| Rivista: | ||
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.ceramint.2018.06.182 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| Ceramics International 2018.pdf | 2a Post-print versione editoriale / Version of Record | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia |
http://hdl.handle.net/11583/2718519
Copyright © 2022