The development of high-temperature electronic equipment places high demands on ultra-wide temperature multilayer ceramic capacitors (UWT-MLCCs). However, the contradiction between the high dielectric constant and excellent temperature stability of existing dielectric materials has hindered the development of UWT-MLCCs. Here, these problems have been solved by constructing localized defect dipoles and heterogeneous structures in BaTiO₃ matrices. A new lead-free dielectric ceramic sample Ba_0.9925Bi_0.005Ti_0.9975Ca_0.0025O_2.9975 (BBTC) has been prepared and the corresponding UWT-MLCCs are fabricated by two-step ball milling process. A record-high dielectric constant (69893.86) together with low dielectric loss (0.044) is achieved over a wide range of -88-400 ^oC for HD-BBTC (which stands for heterogeneous diffusion structure). The excellent results indicate that HD-BBTC can provide a realistic solution for next-generation UWT-MLCC applications and that the material design strategy can be generalized for building higher performance capacitor dielectrics.

中文翻译：

---

基于异质扩散和供体/受体共掺杂的具有超宽温度稳定性的 BaTiO3 基陶瓷


高温电子设备的发展对超宽温多层陶瓷电容器 （UWT-MLCC） 提出了很高的要求。然而，现有介电材料的高介电常数和优异的温度稳定性之间的矛盾阻碍了 UWT-MLCC 的发展。在这里，通过在 BaTiO₃ 基质中构建局部缺陷偶极子和非均相结构来解决这些问题。制备了一种新的无铅介电陶瓷样品 Ba_0.9925Bi_0.005Ti_0.9975Ca_0.0025O_2.9975 （BBTC），并通过两步球磨工艺制备了相应的 UWT-MLCC。HD-BBTC（代表异质扩散结构）在 -88-400 ^oC 的宽范围内实现了创纪录的高介电常数 （69893.86） 和低介电损耗 （0.044）。出色的结果表明，HD-BBTC 可以为下一代 UWT-MLCC 应用提供现实的解决方案，并且材料设计策略可以推广到构建更高性能的电容器电介质中。