Artículo
Investigation of γ′-Fe 4 N−GaN Nanocomposites: Structural and Magnetic Characterization, Mössbauer Spectroscopy and Ab Initio Calculations
Kurian, Sajith; Bhattacharyya, Sayan; Desimoni, Judith
; Peltzer y Blanca, Eitel Leopoldo
; Gil Rebaza, Arles Víctor
; Gajbhiye, N. S.
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Fecha de publicación:
09/2010
Editorial:
American Chemical Society
Revista:
Journal of Physical Chemistry C
ISSN:
1932-7447
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A controlled, one-step ammonolysis method with three different Fe/Ga ratios (70:30, 50:50, and 30:70) was used to synthesize functional nanocomposite materials consisting of 30-40 nm particles of γ′-Fe4N Fe4-xGaxN phases in a GaN and Fe-doped GaN phase matrix. The γ′-Fe4N, Fe4-xGaxN, and GaN phases were confirmed by the Rietveld analysis of the X-ray diffraction patterns, and the Fe-doped GaN phase was confirmed from Mo¨ssbauer spectroscopy and magnetization measurements. The magnetization of the superparamagnetic nanoparticles was expectedly reduced with the Ga incorporation in the samples. The coexistence of antiferromagnetic Fe4-xGaxN and the ferromagnetic γ′-Fe4N phases resulted in an exchange bias effect (hysteresis loop shift of 28 Oe at 5 K) and a gradual magnetic phase transition from 250 to 55 K. Mo¨ssbauer spectroscopic analysis showed a hyperfine magnetic field distribution that the ab initio calculations duly supported. Ab initio calculations of the equilibrium lattice and Mo¨ssbauer hyperfine parameters were also performed.
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Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Citación
Kurian, Sajith; Bhattacharyya, Sayan; Desimoni, Judith; Peltzer y Blanca, Eitel Leopoldo; Gil Rebaza, Arles Víctor; et al.; Investigation of γ′-Fe 4 N−GaN Nanocomposites: Structural and Magnetic Characterization, Mössbauer Spectroscopy and Ab Initio Calculations; American Chemical Society; Journal of Physical Chemistry C; 114; 41; 9-2010; 17542-17549
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