INVESTIGADORES
MARTINEZ GARCIA Ricardo
artículos
Título:
Evidence of existence of metastable SrFe12O19 nanoparticles
Autor/es:
RICARDO MARTÍNEZ GARCÍA; V. BILOVOL; L. M. SOCOLOVSKY; K. PIROTA
Revista:
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2011 vol. 323 p. 3022 - 3026
ISSN:
0304-8853
Resumen:
The existence of metastable hexaferrite is reported. Synthesis of strontium hexaferrite, SrFe12O19, at 400ºC was realized under controlled oxygen atmosphere. Such technique allows obtaining SrFe12O19 at lower temperatures than those used by traditional methods (above 800ºC). Phase transformation occurred during a measurement of magnetization vs. temperature (heating up to 625ºC). The heat treatment induces a change from SrFe12O19 to gamma-Fe2O3 (as main phase), and SrFeO2.74 to Sr2Fe2O5. Together with these phase transformations, an increment of the amount of SrCO3 is detected. Magnetic study of the samples, before and after the heating, supports the structural analysis conclusions.
