Systematics of Mössbauer parameters in Fe57-doped titanate and germanate ilmenites |
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Authors: | Yasuhiko Syono Atsuko Ito Setsu Morimoto |
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Affiliation: | The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai 980, Japan;Department of Physics, Ochanomizu University, Otsuka, Bunkyo-ku, Tokyo 112, Japan |
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Abstract: | The Mössbauer spectra of ilmenite (FeTiO3), Fe2+-doped ilmenites, MTiO3 (M = Cd, Mn, Zn, Co, Mg and Ni) and MGeO3 (M = Mn, Zn and Mg), have been studied from 4.2 K to room temperature. Systematic variations in the isomer shift and quadrupole splitting at room temperature are correlated with the change in ionic radii of the host M ions and the c/a ratio of the host crystal, respectively. The quadrupole splittings show a remarkable temperature variation; the magnetic ilmenites show either a sudden increase or a sudden decrease of quadrupole splittings below the Néel temperature, depending on the orientation of the spin axis with respect to the c axis. |
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