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Energetika / Power Engineering

ISSN 0235-7208


2010 m. Nr. 3-4

Characterization of sol–gel auto-combustion derived spinel ferrite nano-materials
Andris SUTKA, Gundars MEZINSKIS, Arturs PLUDONS, Santa LAGZDINA

CoFe2O4, NiFe2O4 and ferrites ZnFe2O4 were prepared by the auto-combustion method. Scanning electron microscopy (SEM) was used for investigating the microstructural features of combustion reaction products. The structural evolution at different process stages of spinel ferrites are investigated by powder X-ray diffraction (XRD) and Fourier transform infrared techniques (FTIR). The XRD patterns of obtained products after calcination confirm the single-phase cubic spinel type. The average crystallite sizes for different compounds were found to be in nanometer range. The FTIR studies show two fundamental absorption bands which are assigned to the vibration of tetrahedral and octahedral complexes of the spinel structure. The powder-specific surface area was measured using the multi-point Brunauer–Emmet–Teller method (BET). The BET results show that after calcination submicrometer-sized primary particles have been agglomered into larger secondary particles. Atomic force microscopy (AFM) was used to study the dimensions of calcined ferrite particles. AFM images show that particles are of nanometer dimensions. Room temperature D. C. electrical conductivity measurements of the spinel ferrites show that the obtained compounds are of lower coductivity compared with spinel ferrites obtained by the convenctional ceramic technique.

Keywords: spinel ferrite, nanoparticles, combustion reaction, atomic force microscopy

Numeriai:

2011 - T.57
Nr.1, Nr.2, Nr.3, Nr.4

2010 - T.56
Nr.1, Nr.2, Nr.3-4

2009 - T.55
Nr.1, Nr.2, Nr.3, Nr.4

2008 - T.54
Nr.1, Nr.2, Nr.3, Nr.4

2007 - T.53
Nr.1, Nr.2, Nr.3, Nr.4

2006
Nr.1, Nr.2, Nr.3, Nr.4

2005
Nr.1, Nr.2, Nr.3, Nr.4

2004
Nr.1, Nr.2, Nr.3, Nr.4

2003
Nr.1, Nr.2, Nr.3, Nr.4

2002
Nr.1, Nr.2, Nr.3, Nr.4

2001
Nr.1, Nr.2, Nr.3, Nr.4