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Rare Earth substituted Sesquioxides compounds, specially Yttria (Y2O3) are essential ceramic materials for solid-state lasers, light-emitting diodes, microchip lasers, and infrared detectors. In the present work, Ytterbium (Yb3+) substituted Y2O3 (Y2−xYbxO3, where, x = 0.0, 0.04, 0.08 and 0.12) ceramics are synthesized using co-precipitation method. The prepared samples were examined for structural, morphological and opto-electrical properties. The X-ray diffraction pattern shows the cubic phase for pure Y2O3 and mixed phase (cubic + monoclinic) for Yb3+doped Y2O3 ceramics. The lattice parameters initially decreases and then slightly increases with the incorporation of Yb3+ ions in Y2O3. Field-emission scanning electron microscopy demonstrate the morphological changes with varying particle size from 41 to 82 nm. The presence of Yb3+ ions in Y2O3 nanopowders have been additionally confirmed by XPS analysis. The optical studies dispaly a strong absorption between 200 and 360 nm with maximum bandgap value of 4.77 eV. The photoluminescence spectra shows characteristic peaks of violet, indigo, blue and green emission at 380 nm, 422 nm, 486 nm and 527 nm respectively. The dielectric constant and dielectric loss were observed to decrease with increasing frequency at room temperature. [ABSTRACT FROM AUTHOR]

Yttrium oxide (Y2O3)$( {{{\mathrm{Y}}}_2{{\mathrm{O}}}_3} )$ has the potential to be used as a host material for creating polycrystalline transparent ceramics (PTCs). This paper presents an experimental study on opto‐electrical properties of Y2O3${{\mathrm{Y}}}_2{{\mathrm{O}}}_3$ using zirconium oxide (ZrO2)$( {{\mathrm{ZrO}}_2} )$ and lanthanum oxide (La2O3)$({\mathrm{La}}_2{{\mathrm{O}}}_3)$ as sintering aids via the co‐precipitation technique. The sintering aids improve the properties, sintering process, and lower the sintering temperature. Five different compositions of Y2O3(((Y1−xZr0.02Lax)2O3),wherex=0,3,6,and9at.%)${{\mathrm{Y}}}_2{{\mathrm{O}}}_3\ ( {({{( {{{\mathrm{Y}}}_{1 - x}{\mathrm{Zr}}_{0.02}{\mathrm{La}}_x} )}}_2{{\mathrm{O}}}_3} ),{\mathrm{\ where\ }}x = 0,\ 3,\ 6,{\mathrm{\ and\ }}9{\mathrm{\ at}}.{\mathrm{\% }})$ were synthesized and they were then used to analyze for their structural, morphological, physio‐chemical, and electrical characteristics. For the system studied, the addition of ZrO2${\mathrm{ZrO}}_2$ and La2O3${\mathrm{La}}_2{{\mathrm{O}}}_3$ does not change the phase of pure Y2O3${{\mathrm{Y}}}_2{{\mathrm{O}}}_3$, but an increase in the crystal and grain size from 31.2$31.2$ to 42.5nm$42.5{\mathrm{\ nm}}$ and 10.2 µm to 16.4 µm was noticed. The thermal characterization over thermogravimetric analysis/differential thermal calorimetry (TGA/DSC) determines the temperature at which pure Y2O3${{\mathrm{Y}}}_2{{\mathrm{O}}}_3$ undergoes a phase transition, specifically over 700°C. A reduction in the band gap due to strain induced by the dopant resulted in a decrease in energy from 5.54$5.54$ to 4.8eV$4.8{\mathrm{\ eV}}$. The dielectric constant of Y2O3${{\mathrm{Y}}}_2{{\mathrm{O}}}_3$ doped with 9at.%La$9{\mathrm{\ at}}.{\mathrm{\% \ La}}$ exhibits a significant increase of ∼50%${\sim}50\%$. [ABSTRACT FROM AUTHOR]