Ultra‐Broad Temperature Stability Obtained with Ce‐Doped BaTiO₃‐Based Ceramics

Abstract

Ce‐doped BaTiO3‐based ceramics were prepared and studied to satisfy ultra‐broad temperature stability (from −55°C to 300°C, capacitance variation rate based on C20°C is within ±15%). The sample with 0.6 mol% CeO2 succeeds to achieve this performance with a remarkably high ceiling temperature of 300°C. Meanwhile, the sample has good dielectric and electrical properties at room temperature (εr = 1667, tanδ = 1.478%, ρV = 5.9 × 1012 Ω·cm). Ce ion can substitute for Ti ion as Ce4+ or Ba ion as Ce3+. The substitution decreases the spontaneous polarization of BaTiO3, and then weakens the ferroelectricity of BaTiO3. As a result, the temperature stability of samples is improved obviously. Besides, CeO2 addition promotes the formation of exaggerated grains, which are consisting of Ba6Ti17O40.

High permittivity and excellent high‐temperature energy storage properties of X9R BaTiO3–(Bi0.5Na0.5)TiO3 ceramics

“…At present, the highest dielectric constant of BaTiO 3 ‐based ceramic is 2458 at 20°C, and the highest dielectric constant of K 0.5 Na 0.5 NbO 3 ‐based ceramic is 2310 . The dielectric constants of most BaTiO 3 ‐based ceramics are lower than 2000 . It is necessary to improve the dielectric constant of BaTiO 3 ‐based ceramic up to 2000 and dielectric loss lower than 2% at temperature of 25°C.…”

Effect of MnO2on the dielectric properties of Nb‐doped BaTiO3‐(Bi0.5Na0.5)TiO3ceramics for X9RMLCCapplications

“…As well known, BaTiO 3 (BT) has a tetragonal structure at room temperature and changes to a cubic structure when it's heated. The temperature of the phase transition from tetragonal to cubic is called Curie temperature ( T c ) . However, it is difficult to prepare pure BT ceramics with week temperature dependence due to its sharp transition at the Curie temperature ( T c = 130°C).…”

The effect of glass addition on the ultra-broad temperature stability of BaTiO3–Na0.5Bi0.5TiO3–Nb2O5-based ceramics

“…In our previous reports, the influence of rare earth and MgO on BNN-based system has been investigated [5][6][7]. However, effects of glass content on the system have not been studied.…”