Abstract
Abstract Reaction of rare earth acetylacetonates with rubidium fluoride in methanol medium at room temperature produced crystalline phases and they were characterized using various analytical techniques. Fluorite structured products with RbREF4 stoichiometry were obtained for RE = Pr, Nd, Sm, Eu and Tb as revealed from their powder X-ray diffraction (PXRD) patterns, and wet chemical analysis. RbRE2F7 crystallizing in orthorhombic symmetry resulted for the rare earths from Dy to Yb as illustrated by their PXRD patterns, HR-TEM and selected area electron diffraction (SAED) techniques. While cubic RbPrF4 showed three phonon modes at 197, 281 and 324 cm−1, orthorhombic RbEr2F7 exhibited 10 modes at 128, 191, 236, 277, 341, 435, 520, 587, 642 and 726 cm−1, respectively in its Raman spectrum at room temperature. Optical transitions arising from the f-shell of the rare earth ions have been observed in UV–visible and photoluminescence spectra and analyzed.
Published Version
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