The impact of Eu3+ ion substitution on dielectric properties of Y3−xEuxAl5O12 (0.00 ≤ x ≤ 0.10) ceramics.

This study reported the effect of Eu substitutions on the conductivity and dielectric properties of Y_3−xEu_xAl₅O₁₂ (0.0 ≤ x ≤ 0.1), YAG:xEu³⁺. All products were fabricated by solid state route. The formation of YAG was approved through X-ray diffraction powder diffraction and high-resolution transmission electron microscope. It was found that the lattice parameters are increasing with increase the substitution content due to the difference in ionic radii between Y³⁺ and Eu³⁺. Electrical and dielectric properties of YAG (Y₃Al₅O₁₂) and YAG:xEu³⁺ ceramics were investigated extensively for a variety of concentrations (0.00 ≤ x ≤ 0.1) of the substitutional Eu³⁺ ion from the 4f lanthanide group. The temperature dependence of dielectric loss, dielectric constant, loss tangent and ac/dc conductivity were examined up to 5.0 MHz to understand the electrical and dielectric properties for both doped and undoped YAG ceramics. The experimental results revealed that Eu³⁺ ion substitutions (especially x = 0.05) in YAG ceramics meaningfully influence the lossy mechanisms, conductivity and dielectric constant which is probably due to the contribution to the conduction mechanism of the 4f-Eu and 3d-Al ions. So, this can be incorporated at the exceptional sites of both O_h (octahedral) and T_d (tetrahedral) symmetries in YAG: xEu³⁺ ceramics. [ABSTRACT FROM AUTHOR]