Low-Temperature Synthesis and Characterization of Ferrite Powders with Spinel Structure

V.S.Bushkova,
 
B.K.Ostafiichuk
 

Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2015, #09/10
http://www.materials.kiev.ua/article/1992

Abstract

Nanoparticles of NiAlxFe2-xO4 (х = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) are synthesized by sol–gel method with auto-combustion. X–ray diffraction patterns confirm the single phase spinel structure of the samples produced. The scanning electron microscope images indicate that the particle size of the samples lies in the nanometer range. Prepared in this manner, the powder is synthesized with high crystallinity and good morphological homogeneity. It is observed that the grain size decreases from 46 nm to 18 nm as the nonmagnetic Al content increases. The lattice constant and X-ray density of ferrites depending on the content of the component x are determined. Structural and adsorption characteristics of the synthesized samples are determined by analysis of the N2 isotherms measured at 77 K. It is demonstrated that the samples produced are mesoporous for possessing the pores in the 2–5 nm range. The thermal processes are investigated by thermal analysis and infrared spectroscopy. It is established that the nitrate–citrate gel burns automatically and directly transforms into nanosized ferrite particles, after burning.


INFRARED SPECTROSCOPY, NANOPARTICLES, NI–AL FERRITE, SOL-GEL METHOD, THERMAL ANALYSIS