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Physicochemical properties of pseudobrookite Fe2TiO5 synthesized from ilmenite ore by co-precipitation route

Mahmoud Mohamed H. H., Hessien Mahmoud M., Alhadhrami Abdulrahman, Gobouri Adel A.

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 1

290--300

Pseudobrookite (Fe2TiO5) is a semiconductor with numerous potential applications. Low-grade ilmenite ore has been used as an inexpensive source of Fe and Ti for preparation of Pseudobrookite. Ilmenite was first leached with 20% hydrochloric acid for 3 h at 70°C. Co-precipitation of soluble Fe and Ti from the rich filtrate was carried out at pH ≥ 9.1 followed by calcination at different temperatures (900-1300oC) for 2 h. X-ray diffraction patterns (XRD) showed that a single-phase nanocrystalline pseudobrookite powder was produced. The pH was a critical parameter for the evolution of formation the different sizes, structural morphology, and the magnetic properties of the product. Scanning electron microscope (SEM) images showed that particles synthesized at pH 11.2 contained more agglomerations and were more porous than those synthesized at pH 9.1. As the calcination temperature increases, the Fe2TiO5 changes from a small rod-like structure to an elongated rod-like structure, and finally to interconnected aggregated crystals. The magnetization of the synthesized Fe2TiO5 was measured using a vibrating sample magnetometer (VSM) and was found steadily increase with increasing calcination temperature from 1000 (≈9 emu/g) to 1300°C (16 emu/g). Such a large saturation of magnetization might be due to the high phase purity and well-defined crystallinity of Fe2TiO5.

Morphology control of pseudobrookite-type MgTi2O5&ensppowders by LiF doping

Nakagoshi Y., Suzuki Y.

International Letters of Chemistry, Physics and Astronomy

2015

Vol. 46

37--41

Well-controlled fine MgTi2O5 &ensppowders, with pseudobrookite-type structure, are desired toward various industrial applications, however, commercial powders are hardly available to date. In this study, we focused the processing and characterization of well-controlled MgTi22O5 &ensppowders with/without LiF additive. MgCO3 &ensp(basic) and TiO2&ensp anatase powders with/without 0.5 wt. % LiF additive were calcined in air at 1100 °C for 2 h to obtain the MgTi2O5 &ensppowders. SEM observation revealed that the non-doped MgTi2O5 &ensppowder consisted of equiaxed particles with the diameter of 0.51.5 μm, whereas, the LiF-doped MgTi2O5 &ensppowder consisted of elongated particles with the length of ~ 5-10 μm and the diameter of ~1.0-1.5 μm. The smooth surface of elongated MgTi2O5 &enspparticles demonstrates the effect of LiF doping as a flux, i.e., liquid phase formation during the reaction.