Abstract
A new iron titanyl phosphate Fe 0.50Ti 2(PO 4) 3 was synthesized by both solid-state reaction and Cu 2+–Fe 2+ ion exchange method. The material was then characterized by X-ray diffraction, Mössbauer, magnetic susceptibility measurements and optical absorption. The crystal structure of the compound was refined, using X-ray powder diffraction data, by the Rietveld profile method; it crystallizes in the rhombohedral system, space group R 3 ¯ , with a=8.511(1) Å and c=20.985(3) Å, V=1316.45(3) Å 3 and Z=6. The structure, which is compared to that of Mn 0.50Ti 2(PO 4) 3 is built up from [TiO 6] octahedra and [PO 4] tetrahedra which are linked by corner sharing along the c-axis. Fe 2+ cations are located in half of the antiprism M I sites and are orderly distributed with vacancies within the two possible positions of the M I sites of R 3 ¯ . These results were supported by the Mössbauer studies that showed the presence of one Fe 2+ site in the high spin state ( t 2g 4 e g 2). The Curie–Weiss-type behavior is observed in the magnetic susceptibility. Diffuse reflectance spectrum indicates the presence of octahedrally coordinated Fe 2+ ions.
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