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Influence of preparation method on structural, optical and magnetic properties of nickel ferrite nanoparticles

Khan A. A., Javed M., Khan R. A., Iqbal Y., Majeed A., Hussain S. Z., Durrani S. K.

Materials Science Poland

2017

Vol. 35, No. 1

58--65

Nanocrystalline NiFe2O4 particles were prepared by conventional sol-gel, citrate-nitrate sol-gel combustion and co-precipitation methods. The synthesized samples were annealed at 1000 ºC for two hours and structural, chemical, morphological, optical and magnetic properties of nickel ferrite were investigated. The structural properties were investigated by X-ray diffraction (XRD) technique which confirmed the formation of single phase NiFe2O4 particles derived by the three methods. The chemical properties were analyzed by Fourier transform infrared (FT-IR) spectroscopy which confirmed the corresponding vibration modes in the samples. The optical properties were studied by UV-Vis spectroscopy. The morphological study of the as-synthesized samples was carried out by scanning electron microscopy (SEM). SEM images showed the agglomerated nanoparticles of NiFe2O4. The magnetic properties were investigated by vibrating sample magnetometer (VSM), which showed that the calcined samples exhibited typical magnetic behavior.

Fabrication of magnesium aluminum silicate glass ceramics by sintering route

Durrani S. K., Hussain M. A., Hussain S. Z., Hussain S. Z., Akhtar J., Saeed A., Hussain N., Ahmed N.

Materials Science Poland

2010

Vol. 28, No. 2

459--466

Magnesium aluminum silicate (MAS) glass ceramic material was prepared by the sintering route. A three-stage heat treatment, consisting of calcination, nucleation and crystallization, was developed with MgF2 as a nucleating agent. The effect of the percentage chemical composition and the sintering temperature on the density of the compacted material was also studied. The thermal stability of MAS was measured by thermogravimetry (TG), differential thermal analysis (DTA). TG/DTA studies revealed that the powder exists as MgO-Al2O3-SiO2-H2O in solid state, and then transforms to MgO-Al2O3-SiO2 via some metastable intermediates above 300 °C. The microstructure and phases were analyzed by X-ray diffractometry (XRD). XRD analysis revealed the formation of various phases such as magnesium silicate, fluorophlogopite, nobergite, siliminite etc. at various processing temperatures.