An Ultra‐Broad Working Temperature Dielectric Material of BaTiO3‐Based Ceramics with Nd2O3 Addition

Abstract

An ultra‐broad working temperature dielectric material, BaTiO3–Na0.5Bi0.5TiO3–Nb2O5–MgO–Glass with Nd2O3 addition, was investigated for the first time. Microstructure and dielectric properties of the well‐sintered samples were studied. XRD results showed the formation of tetragonal perovskite and the presence of a second phase of NaBiTi6O14. It is found that the addition of Nd2O3 produces a decrease in tetragonality of perovskite structure which could be interpreted by the substitution of Nd3+ ions into Ti sites. Bulk densities and dielectric properties were measured as a function of Nd2O3 concentration. The 0.4 mol% Nd2O3‐doped sample showed the optimal dielectric performance (εr = 1445, tan δ<2.0%, ΔC/C ≤±12%) that satisfied EIA‐X9R specification. In particular, the ceiling working temperature was significantly enhanced from 200°C to 270°C by doping Nd2O3. Since it possesses large dielectric constant, low dielectric loss, and stable temperature character, this material shows promising applications for the ultra‐broad temperature range components, e.g., multilayer ceramic capacitors.