Abstract
The synthesis of rare-earth-doped barium tungstate has increased in
recent decades due to the attractive electrical and optical properties
of the material. In this study, erbium-doped barium tungstate was
synthesized by the co-precipitation method with three different concentrations: Ba(1-x)ErxWO4 (where x = 0.00, 0.01, and 0.02). The
materials were characterized by X-ray diffraction (XRD), Raman and
Fourier-transform infrared (FT-IR) spectroscopy, scanning electron
microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS).
Subsequently, the samples were subjected to temperature variations in
the range of 123-293 K, and their Raman spectra were collected to
observe the structural changes induced by Er doping. We observed that at
low temperatures, there was no indication of phase transition for pure
tungstate (BaWO4); however, for doped tungstates, changes were observed
in the Raman spectra, showing an unexpected structural phase transition.
(C) 2019 Elsevier B.V. All rights reserved.
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