Abstract
Transparent-yellow ytterbium difluoride YbF2+x single microcrystals up to 0.5 mm were successfully synthesized by the vapor-based comproportionation reaction from YbF3 with excess of Yb0 metallic in an evacuated quartz ampoule at 1150 K. The cubic single-phase YbF2+x crystals with near-stoichiometric composition have lattice parameters a = 5.5983(3) – 5.5964(2) Å for x = 0.01–0.03. Single-crystal structure determination was carried out within the space group Fm-3m. The surface morphology of the grown microcrystalline aggregates was investigated by optical and scanning electron microscopy in detail. Layer-by-layer growth of crystal planes in the 〈100〉 and 〈111〉 directions on the surfaces of the crystal aggregates and characteristic cuboctahedral voids were observed. Some of the physical properties of the synthesized YbF2+x microcrystals were investigated to determine the potential for their use in photonics and solid-state chemisty.
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