Topochemical nitridation of Sr2FeMoO6

Topochemical nitridation of Sr2FeMoO6

The topotactic nitridation of cation ordered, tetragonal Sr2FeMoO6 in NH3 at moderate temperatures leads to cubic, Fm3m double perovskite oxynitride Sr2FeMoO4.9N1.1 where double-exchange interactions determine ferromagnetic order with TC ≈ 100 K. Substitution of oxide by nitride induces bond asymmet...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Chemical communications (Cambridge, England) England), 2019, Vol.55 (21), p.3105-3108
Hauptverfasser: Ceravola, Roberta, Frontera, Carlos, Oró-Solé, Judith, Black, Ashley P, Ritter, Clemens, Mata, Ignasi, Molins, Elies, Fontcuberta, Josep, Fuertes, Amparo
Format: Artikel
Sprache:eng
Schlagworte:
Ammonia
Ferromagnetism
Magnetoresistance
Magnetoresistivity
Perovskites
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The topotactic nitridation of cation ordered, tetragonal Sr2FeMoO6 in NH3 at moderate temperatures leads to cubic, Fm3m double perovskite oxynitride Sr2FeMoO4.9N1.1 where double-exchange interactions determine ferromagnetic order with TC ≈ 100 K. Substitution of oxide by nitride induces bond asymmetries and local electronically driven structural distortions, which combined with Fermi level lowering restricts charge itinerancy to confined regions and preclude spontaneous long-range magnetic order. Under a magnetic field, ferromagnetic correlations expand, favoring charge delocalization and a negative magnetoresistance is observed.
ISSN:1359-7345
1364-548X
DOI:10.1039/c8cc09845j