The luminescence modulation behaviour under the in-situ electric field of rare-earth doped KSr₂Nb₅O₁₅ ceramics opened a new door for the development of dielectric materials. Where the understanding the effect of rare-earth doping on the electric properties of host, especially at the similar doping concentration with luminescence researches (low concentrations) is very important for the exploration of mechanism of electric-luminescent coupling effect. In this work, Nd³⁺-doped KSr₂Nb₅O₁₅ (KSN-xNd) ceramics were synthesized, and the electric properties were investigated systematically. Our results suggest that the Nd³⁺ doping slightly increased the phase transition temperatures and improved the piezoelectric response of KSr₂Nb₅O₁₅. Most importantly, a bidirectional dielectric tunability is revealed in KSr₂Nb₅O₁₅. The dielectric permittivity can be adjusted by the DC electric bias, with tunability ranging from −12.3% to 21.9%. The related mechanism and relationship between the bidirectional dielectric tunability and ferroelectricity are revealed by temperature-dependent dielectric and ferroelectric characterization. The researches of electric properties and bidirectional dielectric tunability of KSN-based ceramics paved the way to further exploration of electric-luminescent coupling mechanism.

稀土掺杂KSr ₂ Nb ₅ O ₁₅陶瓷在原位电场下的发光调制行为为介电材料的发展打开了新的大门。其中了解稀土掺杂对主体电学性质的影响，特别是在与发光研究（低浓度）相近的掺杂浓度下，对于探索电致发光耦合效应的机制非常重要。在这项工作中，合成了Nd ³⁺掺杂的KSr ₂ Nb ₅ O ₁₅ (KSN- xNd ) 陶瓷，并系统地研究了其电性能。我们的结果表明 Nd ³⁺掺杂略微提高了相变温度并改善了KSr ₂ Nb ₅ O ₁₅的压电响应。最重要的是，KSr ₂ Nb ₅ O ₁₅显示出双向介电可调性。介电常数可以通过直流电偏压进行调节，可调范围为-12.3% 至 21.9%。通过温度相关的介电和铁电表征揭示了双向介电可调性与铁电性之间的相关机制和关系。KSN基陶瓷的电学性质和双向介电可调性的研究为进一步探索电致发光耦合机制铺平了道路。