BaTiO₃-based multilayer ceramic capacitors (MLCCs) with Ni inner electrodes face two critical challenges: DC bias causes a sharp decrease in the dielectric constant, and the material may become semiconducting during sintering in a reducing atmosphere. To overcome these issues, we adopted a multi-element (Y, Mn, Mg) doping strategy to successfully construct a core-shell architecture. This design significantly suppresses the decay of the dielectric constant in the core under a DC bias. A systematic analysis was conducted on the effects of sintering atmosphere and annealing on the microstructure and dielectric properties. The results reveal that the sample Y-N, sintered in a reducing atmosphere, exhibits excellent DC bias stability. This can be attributed to its higher defect concentration, which effectively inhibits the migration of oxygen vacancies. Consequently, Y-N shows only a −0.61% decay rate of the dielectric constant at 2 V/μm, while achieving remarkable temperature stability (meeting the EIA X8R specification) and frequency stability (with a −2.1% variation from 1 kHz to 1 MHz). In contrast, samples annealed in air exhibit degraded DC bias stability at high electric fields due to shell thinning. This work provides valuable insights for the development of highly reliable dielectric materials for base-metal electrode MLCCs applications.

Recently, NaNbO₃-based ceramics with excellent energy storage performances (ESPs) and fast charge-discharge characteristics have attracted great attention. In this case, BaTiO₃ modified 0.85NaNbO₃-0.15Bi(Zn_2/3Nb_1/3)O₃ (0.85NN-0.15BZN-yBT) ceramics were designed and successfully fabricated using solid state synthesis. The discharge storage density of the ceramics increases from 1.22 J/cm³ at y = 0–1.84 J/cm³ at y = 8%, which is 1.5 times higher than pure 0.85NN-0.15BZN ceramics. This ceramic reveals excellent temperature stability up to 150 ℃, good discharge cycling after 10⁵ cycles and high discharge speed of 2.0 μs, broadening the scope of NaNbO₃-based ceramics for energy storage applications.

In the current work, the bulk ternary (0.85-x) BiFeO₃-xBaTiO₃-0.15PbTiO₃ (BF-BTx-PT, x=0.08-0.35) system has been studied as a potential high-temperature piezoceramics. Samples with various content of BT were prepared via solid-state route, and pure perovskite phase was confirmed by X-ray diffraction. The temperature dependence of dielectric constants confirmed the decrease of Curie temperature with increasing BT content. It was found that the morphotropic phase boundary (MPB) composition of BF-BTx-PT ceramics was in the vicinity of x=0.15, which exhibits optimal properties with piezoelectric constant d₃₃ of 60 pC/N, high Curie temperature of 550 ℃, and low sintering temperature of 920 ℃. Measurements also showed that the depoling temperature was 300 ℃, about 150 ℃ higher than that of commercialized PZT ceramics, which indicated good temperature stability. BF-BTx-PT ceramics are promising candidates for high temperature applications.