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<p>In this article, the pyrochlore phase Y<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> doped with erbium (Er) and/or ytterbium (Yb) was successfully synthesized via hydrothermal-assisted sol–gel approach followed by systematic calcination steps. The pure phase pyrochlore Y<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> nanoparticles were obtained by the mixed titanium-yttria matrix. The crystallization of the pyrochlore phase of all samples was investigated with X-ray diffraction. It has been clearly shown that the doping with erbium or ytterbium improves the crystallization of the pyrochlore oxide phase at low temperature. Spherical doped and undoped Y<sub>2</sub>O<sub>3</sub>–TiO<sub>2</sub> nanoparticles with a 19–60&#xa0;nm diameter size was dispersed in water, ethanol, and methanol using an original method which is ultrasound as a second step. The purpose of this work was to prepare a stable suspension for a certain period to use it in many chemical and biotechnological applications. The measurement of zeta potential and particle size distribution indicates a rapid decantation of the prepared suspensions due to the magnification of the particle size after annealing. The results showed that the optimal conditions were obtained for the pure Y<sub>2</sub>O<sub>3</sub>–TiO<sub>2</sub> when the water is the solvent. This suspension exhibited high stability during aging time. The results of Hamaker 2.2 software confirm the experimental results obtained.</p>

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The good colloidal stability and the aggregation kinetics of sol–gel pyrochlore-type Y2Ti2O7 nanoparticle doped with rare earth (Er, Yb) element

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Ikram Benammar,
  • Ridha Elleuch,
  • Rached Salhi,
  • Jean-Luc Deschanvres,
  • Ramzi Maalej

摘要

In this article, the pyrochlore phase Y2Ti2O7 doped with erbium (Er) and/or ytterbium (Yb) was successfully synthesized via hydrothermal-assisted sol–gel approach followed by systematic calcination steps. The pure phase pyrochlore Y2Ti2O7 nanoparticles were obtained by the mixed titanium-yttria matrix. The crystallization of the pyrochlore phase of all samples was investigated with X-ray diffraction. It has been clearly shown that the doping with erbium or ytterbium improves the crystallization of the pyrochlore oxide phase at low temperature. Spherical doped and undoped Y2O3–TiO2 nanoparticles with a 19–60 nm diameter size was dispersed in water, ethanol, and methanol using an original method which is ultrasound as a second step. The purpose of this work was to prepare a stable suspension for a certain period to use it in many chemical and biotechnological applications. The measurement of zeta potential and particle size distribution indicates a rapid decantation of the prepared suspensions due to the magnification of the particle size after annealing. The results showed that the optimal conditions were obtained for the pure Y2O3–TiO2 when the water is the solvent. This suspension exhibited high stability during aging time. The results of Hamaker 2.2 software confirm the experimental results obtained.