Raman Spectroscopic Analysis of Perovskite-Structured Alkali Metal Fluorides Containing Nickel and Copper Ions |
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| Authors: | R Nagarajan Neetu Tyagi |
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| Institution: | 1. Materials Chemistry Group, Department of Chemistry , University of Delhi , Delhi , India rnagarajan@chemistry.du.ac.in;3. Materials Chemistry Group, Department of Chemistry , University of Delhi , Delhi , India |
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| Abstract: | ABSTRACT The mixed metal fluorides containing alkali metals have a range of important applications in optical and electronic devices. Raman spectrums of two such fluorides were examined. Raman spectrum of KCuF3 at 300 K exhibited bands at 261, 295, 363, 468, 519, and 549 cm?1, indicating site symmetry (orthorhombic) lower than the tetragonal symmetry as observed from the powder X-ray diffraction pattern. Cubic KNiF3 showed bands at 410, 468, and 657 cm?1. The first two bands were attributed to the second-order phonon scattering, and the band at 657 cm?1 was assigned to two-magnon peak. |
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| Keywords: | green synthesis Jahn-Teller distortion mixed metal fluorides Raman spectroscopy |
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