2004 年 15 巻 p. 140-142
Two new phosphates Fe0.5TiO(PO4) and Fe0.5Ti2(PO4)3 have been prepared and characterised by X-ray diffraction, Mössbauer spectroscopy and magnetic measurements. Fe0.5TiO(PO4) is isostructural to the oxyphosphate Ni0.5TiO(PO4) while Fe0.5Ti2(PO4)3 belongs to the Nasicon family. Their structures are formed by a 3D framework of TiO6 octahedra and PO4 tetrahedra linked by corners. Fe2+ ions occupy isolated octahedral cavities situated between two TiO6 octahedra. The magnetic and Mössbauer parameters are typical of Fe2+ ions in octahedral sites with high spin configuration t2g4e2g.