Characterization of nanosized maghemite particles prepared by microemulsion using an ionic surfractant

We have characterized a system of maghemite, γ -Fe2 O3 , nanosized particles prepared by a microemulsion method using an ionic surfactant. The Mössbauer spectra from 21 to 298 K evolve from a totally magnetically split signal at low temperatures to a single superparamagnetic (sp) doublet at 298 K with a blocking temperature of ≈150 K. The real component of the AC susceptibility (5Hz< ν< 10E4 Hz) displays a behavior characteristic of a system of interacting particles. A broad distribution of the particle sizes is revealed by the much higher average energy barrier obtained by AC susceptibility than Mössbauer.

Ver el registro completo

Archivos asociados

Tamaño: 80.46Kb

Formato: PDF

Descargar

Licencia

Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)

Identificadores

URI: http://hdl.handle.net/11336/59956

URL: https://link.springer.com/article/10.1023/B:HYPE.0000003770.22742.e7

Colecciones

Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE

Articulos(CINDECA)
Articulos de CENTRO DE INV EN CS.APLICADAS "DR.JORGE J.RONCO"

Articulos(IFLP)
Articulos de INST.DE FISICA LA PLATA

Citación

Tueros, Matias Jorge; Baum, Lorena Alejandra; Borzi, Rodolfo Alberto; Stewart, Silvana Jacqueline; Mercader, Roberto Carlos; et al.; Characterization of nanosized maghemite particles prepared by microemulsion using an ionic surfractant; Kluwer Academic/Plenum Publ; Hyperfine Interactions; 148; 1; 12-2003; 103-108