ABSTRACT

Barium strontium titanate (BST)-based complex ceramics are lead-free high performance ferroelectric or relaxor materials for applying on electronics and energy storages. Here, based on Ba_0.7Sr_0.3TiO₃, a giant dielectric enhancement is achieved by trace sodium niobate doping. The dielectric constants and strengths are enhanced up to 13850 and 330 kV/cm with acceptable loss behaviours. In combination with structure and property characterisations, such great enhancements can be attributed to disorderly substitutions with resulted relaxor phase transition and interfacial couples. Thus, the present study not only presents an effective method of enhancing the dielectric properties of BST-based materials but also a novel way to achieve lead-free relaxors.

摘要

钛酸锶钡（BST）基复合陶瓷是一种无铅高性能铁电或弛豫材料，用于电子和储能。这里，基于 Ba _0.7 Sr _0.3 TiO ₃，通过微量铌酸钠掺杂实现了巨大的介电增强。介电常数和强度提高到 13850 和 330 kV/cm，具有可接受的损耗行为。结合结构和性质表征，这种巨大的增强可归因于无序取代，导致弛豫相变和界面耦合。因此，本研究不仅提供了一种增强 BST 基材料介电性能的有效方法，而且还提供了一种实现无铅弛豫的新方法。