Varistor, Dielectric, and Luminescent Properties of Pr₆O₁₁‐doped TiO₂ Multifunctional Ceramics

Abstract

A series of Pr 6 O 11 (x = 0-0.70 mol%)-doped TiO 2 ceramics were synthesized by the conventional solid-state reaction method. The microstructure, electrical, and luminescence properties were systematically investigated. The results showed that the as-prepared TiO 2 ceramics exhibited strong red emission at 606 nm at room temperature and the optimal photoluminescence were obtained at x = 0.30. In addition, the nonlinear coefficient was improved with the amount of Pr 6 O 11 dopant, reaching the maximum value at x = 0.50. Therefore, Pr 6 O 11 -doped TiO 2 ceramics, which simultaneously exhibited luminescent properties and good electrical properties, would be useful in novel multifunctional devices.

PREPARATION AND CHARACTERIZATION OF TiO₂-Ta₂O5-CaCO₃ VARISTOR CERAMICS BY HOT ISOSTATIC PRESSING (HIP) AND POST-ANNEALING

“…Because of nonlinear electrical behavior and sensitivity to instantaneous voltage fluctuations, varistor ceramics are widely used in circuits such as overvoltage protection, high voltage stability and high energy surge absorption [1][2][3]. The nonlinear behavior of a varistor is closely associated with the grain boundary barrier structure of polycrystalline ceramics [4].…”