Structural, Optical, Luminescence, and Electrical Properties of Eu/Li- and Eu/Na-Codoped Magnesium Bismuth Niobate Pyrochlores

Eu-doped bismuth-based Bi1.5M0.4Mg0.5Nb1.5O7-delta (M = Li and Na) pyrochlores were synthesized by the organic-inorganic precursor combustion technique. The study examined the effect of rare earth element Eu3+ doping on the structural, dielectric, optical, and luminescence properties of synthesized materials. The analysis showed that the substitution of Bi3+ cations with Eu3+ leads to dielectric permittivity decreasing due to the structural distortion for the Eu-concentrated compositions and low polarizability of Eu3+. The band gap values predicted by electronic band structure calculation using DFT-HSE03 are in line with the experimental ones and tended to increase with the decrease in the unit cell parameters with Eu concentration changing. By the optical and luminescence measurements, the specific roles of Li- and Na-containing host types, additional phases, and dopant concentration in bismuth niobate pyrochlores are shown concerning the dielectric, structural, and Eu3+ emission properties. All Eu-doped bismuth-based pyrochlore ceramics behave as high-frequency dielectrics up to 200 degrees C and have mixed conductivity (electronic, proton, and oxygen) at T > 200 degrees C. The obtained dielectric parameters make them suitable for highfrequency ceramic capacitors.

Automated summary

Eu-doped bismuth-based pyrochlore ceramics were synthesized using the organic-inorganic precursor combustion technique. The study investigated the effect of Eu3+ doping on the structural, dielectric, optical, and luminescence properties, and found that Eu3+ doping caused structural distortion and decreased dielectric permittivity. Additionally, the study also demonstrated the influence of Li and Na content, additional phases, and dopant concentration on the material properties.