Structural studies of evolution of solid solutions of BaTiO3 doped with Er3+ (solid-state reaction method)
DOI:
https://doi.org/10.3989/revmetalm.129Keywords:
BaTiO3, Doping, Er3 , SinteringAbstract
Erbium doped BaTiO3 compositions were synthetized using the conventional solid-state method in air atmosphere, according to the general formula Ba1-xErxTi1-x/4O3 and x = 0.0, 0.003, 0.005, 0.01, 0.05, 0.1, 0.15, 0.20, 0.25, 0.30, 0.35 Er3+ (wt. %). BaTiO3:Er3+ were prepared using barium carbonate [BaCO3], titanium oxide [TiO2] and erbium oxide [Er2O3] as precursors. The powders were decarbonated at 900 °C for 12 h and sintered at 1400 °C for 12 h. The structural evolution of solid solutions was monitored by X-ray diffraction, Raman spectroscopy, Infrared spectroscopy and scanning electron microscopy. The results showed that the crystal phase of the particles obtained was predominately tetragonal BaTiO3. A secondary phase identified as a pyrochlore (Er2Ti2O7) was found when the Er3+ content was higher than 0.05 wt. %. The solubility limit of Er3+ in the crystal structure of BaTiO3 was reached when x was = 0.05. The results obtained by MEB-EDS indicated the incorporation of erbium in the crystalline structure of BaTiO3. The IR results showed no absorption bands contamination of O-H group into the products.
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