Abstract
Fluorite-type Sr1−xRxF2+x (R=Er, Yb, Но) phases were precipitated from aqueous citrate solutions. Compounds in the series Sr1−xRxF2+x (R=Er, Yb, Но) formed 5–9nm weakly-agglomerated powders and/or aqueous colloidal solutions. Surfaces of such nanoparticles were modified in situ by citrate complexes. The phase composition, morphology and size of the formed Sr1−xRxF2+x (R=Er, Yb, Но) nanoparticles were affected by several factors, including R:citrate and Sr:citrate precursor ratios, pH and initial solution concentrations, choice of fluorinating agent (HF or NH4F), order of starting material addition, thermal treatment conditions, etc. All synthesized specimens were characterized by X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), and transmission electron microscopy (TEM) techniques.
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