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Influence of colloidal environment on the properties of Mg-Cu-Zn nanoferrites prepared by precursor method of self-combustion

P. D. POPA1, C. DOROFTEI1,* , N. REZLESCU1

Affiliation

  1. Institute of Technical Physics, Bd. D. Mangeron 47, 700050 Iasi, Romania

Abstract

Mg-Cu-Zn nanoferrites prepared by precursor method of self-combustion are magnetic materials used at high frequency due to their high electrical resistance, thermal stability, low sintering temperature and reduced production cost. In the present paper two compositions, Mg0.3Cu0.2Zn0.5Fe2O4 (A) and Mg0.2Cu0.3Zn0.5Fe2O4 (B), were prepared by precursor method of self-combustion in four colloidal environments with the ratio polyvinyl alcohol /metal (a/m) of 0.5, 1, 2, and 3. The a/m ratio determines the combustion temperature and rate, as well as its oxidizing or reducing character; the structure and composition of nanoparticles resulted from the combustion process are also affected by a/m ratio. The variation of the volume shrinkage and magnetic properties were investigated as a function of the a/m ratio and thermal treatment duration at 1000 oC. It was noticed that for higher concentrations of colloidal environment, the volume shrinkage increases during the sintering, the saturation magnetization decreases, magnetic permeability decreases, and the slope of the curve of permeability versus temperature is controllable (positive, negative or null) according to the duration of the heat treatment. These results are of great importance for electronic applications..

Keywords

Magnesium nanoferrite, Self-combustion, Colloidal environments, Shrinkage, Permeability, Density, Saturation magnetization.

Submitted at: April 7, 2010
Accepted at: April 26, 2010

Citation

P. D. POPA, C. DOROFTEI, N. REZLESCU, Influence of colloidal environment on the properties of Mg-Cu-Zn nanoferrites prepared by precursor method of self-combustion, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 4, pp. 876-880 (2010)