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

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/8425

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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.title FAR INFRARED SPECTRA AND LATTICE VIBRATIONS OF PEROVSKITE FLUORIDES $AMF_{3}$ OF TRANSITION METAL IONS en_US
dc.type article en_US