# FAR INFRARED SPECTRA AND LATTICE VIBRATIONS OF PEROVSKITE FLUORIDES $AMF_{3}$ OF TRANSITION METAL IONS

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 dc.creator Nakagawa, Ichiro en_US dc.creator Kohn, Kay en_US dc.date.accessioned 2006-06-15T13:19:05Z dc.date.available 2006-06-15T13:19:05Z dc.date.issued 1970 en_US dc.identifier 1970-G-5 en_US dc.identifier.uri http://hdl.handle.net/1811/8425 dc.description Author Institution: Department of Chemistry Faculty of Science, University of Tokyo en_US dc.description.abstract Far infrared transmission spectra have been observed at room and liquid nitrogen temperatures for the powder samples. Reflection spectra have been measured for the crystalline samples and optical constants have been obtained from a Kramers-Kronig analysis. $KNiF_{3}$, $RbNiF_{3}$ (high pressure phase), $RbMnF_{3}$ and $RbFeF_{3}$ have cubic perovskite structure ($O{_{h}}^{1}$). $RbNiF_{2}$ and $CsMuF_{3}$ (atmospheric pressure phase) have 6L hexagonal structure ($D{_{6h}}^{4}$) $CsNiF_{3}$ of 2L structure ($D{_{6h}}^{4}$) transforms to the 9L structure ($D{_{3d}}^{9}$) under high pressure. $NaNiF_{3}$ is not uniaxial but it may have the orthorhombic structure of $GdFeO_{z}$ type ($D{_{2h}}^{16}$). Vibrational spectra of these crystals exhibit different features, which reflect the structural variations. On the basis of the dynamical model of crystal, the interionic potential constants corresponding to the $M^{2+}\ldots F^{-}$ and $A^{+}\ldots F^{-}$ interactions are evaluated to be 0.5 $\sim$ 0.8 md/{\AA} and ca. 0.1 md/{\AA}, respectively, from the observed optically active transverse frequencies. en_US dc.format.extent 100150 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title FAR INFRARED SPECTRA AND LATTICE VIBRATIONS OF PEROVSKITE FLUORIDES $AMF_{3}$ OF TRANSITION METAL IONS en_US dc.type article en_US