An Ultra‐Broad Working Temperature Dielectric Material of <scp> <scp>BaTiO</scp> </scp> ₃ ‐Based Ceramics with <scp> <scp>Nd</scp> </scp> ₂ <scp> <scp>O</scp> </scp> ₃ Addition

Abstract

An ultra‐broad working temperature dielectric material, BaTiO 3 – Na 0.5 Bi 0.5 TiO 3 – Nb 2 O 5 – MgO –Glass with Nd 2 O 3 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 NaBiTi 6 O 14 . It is found that the addition of Nd 2 O 3 produces a decrease in tetragonality of perovskite structure which could be interpreted by the substitution of Nd 3+ ions into Ti sites. Bulk densities and dielectric properties were measured as a function of Nd 2 O 3 concentration. The 0.4 mol% Nd 2 O 3 ‐doped sample showed the optimal dielectric performance (ε r = 1445, tan δ&lt;2.0%, Δ C / C ≤±12%) that satisfied EIA ‐ X 9 R specification. In particular, the ceiling working temperature was significantly enhanced from 200°C to 270°C by doping Nd 2 O 3 . 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.