Spectroscopic, thermal, magnetic and structural characterization of K3VF6 prepared at room temperature |
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Authors: | R Nagarajan Neetu TyagiSamuel Lofland KV Ramanujachary |
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Institution: | a Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110007, India b Department of Physics, Rowan University, Glassboro, NJ 08028, USA c Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA |
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Abstract: | A straight forward room-temperature synthesis of V(III) containing complex fluoride K3VF6, using KF and vanadium(III) acetylacetonate is reported. The pale green colored powder was characterized by chemical analysis, powder X-ray diffraction; diffuse reflectance spectroscopy, infrared spectroscopy, Raman spectroscopy, differential scanning calorimetry, scanning electron microscopy, photoluminescence spectroscopy, magnetic susceptibility measurements and photoluminescence spectroscopy. The powder X-ray diffraction pattern was fitted in P21/n space group (monoclinic) with a = 12.106 (1) Å, b = 17.685 (0) Å, c = 11.802 (0) Å, β = 92.23° (1). Differential scanning calorimetry showed phase transitions, occurring at 158 °C and 190 °C. In the FT-IR spectrum, characteristic band for the VF63− group was observed at 508 cm−1. The bands observed in the 335-361 cm−1 region and at 504 cm−1 in the room temperature Raman spectrum of K3VF6 corresponded to the F2g and A1g modes, respectively. The ratio of the frequencies (F2g/A1g) observed in the diffuse reflectance spectrum was fitted on the Tanabe-Sugano diagram to determine the Racah parameter B value of 712 cm−1. Magnetic ordering was not observed down to the lowest measured temperature of 5 K. |
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Keywords: | Complex ternary fluoride Raman spectroscopy Diffuse reflectance spectrum Differential scanning calorimetry Phase transitions Photoluminescence spectroscopy |
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