Journal
MATERIALS RESEARCH INNOVATIONS
Volume 19, Issue 1, Pages 1-6Publisher
MANEY PUBLISHING
DOI: 10.1179/1433075X13Y.0000000195
Keywords
Pseudobrookite; Nanocrystallite; Crystal structure; Homogeneous precipitation; Optical property
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Funding
- Special Funds for Major State Basic Research Program of China [2012CB720300]
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Pseudobrookite (Fe2TiO5) is the prototype of a series of semiconductor materials, which have similar crystal structures, and has various applications. To study its structure, formation mechanism and optical properties, we synthesised well-crystallised Fe2TiO5 nanocrystallites at 800 degrees C using a precursor consisting of equimolar Ti4+ and Fe3+ ions. The precursor was prepared via a homogeneous precipitation method, in which urea was used as the precipitator when it gradually hydrolysed. Both X-ray diffraction analysis and high-resolution transmission electron microscope images indicate that the synthetic Fe2TiO5 is an orthorhombic structure. It is suggested that all Ti4+ ions occupy certain 8f sites in the Fe2TiO5 crystal structure. We think that the synthetic Fe2TiO5 originated from anatase and Fe2O3, and Fe3+ ions in the precursor promoted the transforming of anatase into rutile. The synthetic Fe2TiO5 has an absorption threshold (similar to 580 nm) in visible light region and has a band gap of similar to 2.05 eV.
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