Hydrothermal synthesis and characterizations of Ti substituted Mn-ferrites

AbstarctA series of well-crystallized Mn1−2xTixFe2O4 nanoparticles with x values of 0.0, 0.1, 0.2, 0.3 and 0.4 have been synthesized by hydrothermal route at 180 °C in the presence of NaOH as mineralizer. The obtained ferrite samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and vibrating sample magnetometer (VSM). The XRD analysis showed that pure single phases of cubic ferrites were obtained with x up to 0.2. However, samples with x > 0.2 showed traces of unreacted anatase. The increase in Ti-substitution up to x = 0.2 leads to an increase in the lattice parameter of the prepared ferrites. On the other hand, the increase in Ti-substitution over x = 0.2 leads to a decrease in the lattice parameter. The average crystallite size was in the range of 39–57 nm, where it is increased by increasing the Ti-substitution up to x = 0.3, then decreased for x = 0.4. According to VSM results, the saturation magnetization increased with Ti ion substitution of x = 0.1 and decreased for x > 0.1.

► Hydrothermal synthesized of well-crystallized Ti-substituted MnFe2O4 nanoparticles at 180 °C without any calcination step. The chemical composition was represented by Mn1−2xTixFe2O4 with x having values 0.0, 0.1, 0.2, 0.3 and 0.4.
► The change in lattice parameter and saturation magnetization with increasing Ti-substitution was investigated and explained.
► The change in microstructure due to Ti4+ ions substitutions was investigated using TEM analysis.