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- W2328515645 abstract "The infrared reflectivity spectra have been observed for sintered MCr 2 S 4 (M=Zn, Cd, Hg) near normal incidence in the range from 30 to 900cm -1 . The effective charges of Cr and S ions are determined from the frequencies of transverse and longitudinal modes within small error. The Szigetieffective charges e s * per effective valency Z eff for anions show the correlation with the low frequency electronic dielectric constant ε ∞ which has been established for selenide and oxide spinels and expressed as ε ∞ -1=2.0/(( e s * / Z eff e )+( e s * / Z eff e ) 2 ). By using this empirical relationship, the magnitude of effective charge of cation M is determined within the error in the charge of Cr ion. By the comparison among the obtained effective charges, dielectric constants ε ∞ and the lattice parameters, the increase of ionicity with the decrease of anion radius and a weak influence of chromium ion in comparison with that of cation M to the dielectric constant are shown. From these results, the similarity and the difference of dielectric properties between binary and ternary compounds are discussed." @default.
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- W2328515645 date "1980-01-01" @default.
- W2328515645 modified "2023-09-25" @default.
- W2328515645 title "Vibrational Spectra and Effective Charges in Some Spinels" @default.
- W2328515645 doi "https://doi.org/10.7567/jjaps.19s3.249" @default.
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