Study of single crystal Fe2TiO4 by the measurement of magnetization and Moessbauer spectra

A single crystal of Fe2TiO4 was grown with an infrared ray image furnace and its magnetization and Mossbauer spectra were measured. In a specimen squeezed along [001], we found that, at 77 K, the tetragonal axis and the spontaneous moment are fixed along [001], with a slight deviation in (110) or (11-0) plane (about 10 -- 200) for the moment. In Mossbauer measurement, it was observed that the sharpness of the spectrum was largely affected by the domain distribution. We found several peaks which is ascribed to a special group of Fe2+ ions. We conclude that the E.F.G.Z axis of these Fe2+ ions is vertical to the hyperfine magnetic field H sub(n) and they are on B sites with 3d electron orbitals spreading like that of d epsilon sub(yz) or d epsilon sub(zx). (author)