Structural characteristics of M-type Ba-Sr hexaferrite nanoparticles prepared using sol-gel method: role of the Srion concentrations and annealing temperatures

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Sabah M. Ali Ridha, Mohmmad A. Awad

Abstract

Strontium substituted M-type Barium hexagonal ferrite Ba1-xSrxFe12O19 (x= 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.0) has
been synthesized via Sol-gel autocombustion method. This method has the potential to produce nanoparticle
materials at low temperatures. The thermal decomposition of the autocombustion product verified by
thermogravimetric (TGA) and differential thermal analysis (DTA). To obtain the hexagonal ferrite phase, the
required annealing temperature estimated by TGA analysis. The fine powders produced by autocombustion at
different temperatures (400, 600, and 800 ⁰C) were annealed for three hours. The influence of annealing
temperature on the structural characteristics of Ba-Sr ferrite was investigate in detail by using XRD, and SEM.
The XRD results showed that increasing the annealing temperature leads to a decrease in the proportion of the
intermediate phase such as γ-Fe2O3, α-Fe2O3, and BaFe2O4 phases, while increasing the phase ratio of ferrite
BaFe12O19. Whereas the ferrite phase, BaFe12O19, increases and exists as the single-phase at a temperature above
800 ⁰C. The average crystallite size calculated from Debye-Scherer's law lies in the range of (27-46 nm). While
Lattice parameters of Ba-Sr ferrite found to increase linearly with increasing Sr-ion content, whereas the particle
size estimated from SEM it found to increase with increasing Sr-ion concentration in the range of (27-48nm).

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