The impact of Eu 3+ ion substitution on dielectric properties of Y 3−x Eu x Al 5 O 12 (0.00 ≤ x ≤ 0.10) ceramics

Almessiere M., Unal B., Baykal A., Ercan I., Yildiz M.

Journal of Materials Science: Materials in Electronics, cilt.30, sa.3, ss.2489-2500, 2019 (SCI-Expanded, Scopus)

Özet

This study reported the effect of Eu substitutions on the conductivity and dielectric properties of Y 3−x Eu x Al 5 O 12 (0.0 ≤ x ≤ 0.1), YAG:xEu 3+ . 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 Y 3+ and Eu 3+ . Electrical and dielectric properties of YAG (Y 3 Al 5 O 12 ) and YAG:xEu 3+ ceramics were investigated extensively for a variety of concentrations (0.00 ≤ x ≤ 0.1) of the substitutional Eu 3+ 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 Eu 3+ 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: xEu 3+ ceramics.