In this work, the phase transition behavior and electrostrictive and photoluminescence properties of Sm₂O₃-modified 0.965(K_0.48Na_0.52)(Nb_0.95Sb_0.05)–0.035Bi_0.5(Na_0.82K_0.18)_0.5HfO₃ (KNNS–0.035BNKH) ceramics were investigated. Results showed that the phase structure of the Sm₂O₃-modified ceramics evolved from coexisting orthogonal and tetragonal ferroelectric phases to a relaxor pseudocubic phase along with the strong destruction of the long-range ferroelectric order. Domain switching in Sm-modified ceramics with a relaxor pseudocubic phase became difficult, evident from the PFM images. Consequently, large electrostrictive effect with an electrostrictive coefficient of 0.022 m⁴/C² was obtained in 1.0 mol% Sm-modified samples. With regard to long-term stability, the materials exhibited temperature-independent (20–100 °C) and fatigue−free (up to 10⁵ cycles) behavior, which guarantees their application in various devices. The KNNS–0.035BNKH–xSm ceramics have the advantages of photoluminescence performance with bright orange emission under 407 nm visible light excitation. Overall, KNNS−0.035BNKH−xSm ceramics have broad application prospects in multifunction devices due to their large electrostrictive effect, excellent photoluminescence performance, and long-term stability.

在这项工作中，相变行为以及Sm ₂ O ₃改性的0.965（K _0.48 Na _0.52）（Nb _0.95 Sb _0.05）–0.035Bi _0.5（Na _0.82 K _0.18）_0.5 HfO ₃（KNNS–0.035研究了BNKH陶瓷。结果表明，Sm ₂ O ₃的相结构改性的陶瓷从共存的正交铁电相和正交铁电相演变为弛豫假立方相，同时强力破坏了长距离铁电有序。从PFM图像中可以明显看出，具有弛豫假立方晶相的Sm改性陶瓷的畴转换变得困难。结果，在1.0mol％的Sm改性样品中获得了具有0.022m ⁴ / C ²的电致伸缩系数的大电致伸缩效果。关于长期稳定性，该材料表现出与温度无关的（20–100°C）和无疲劳（最多10 ⁵个循环）的性能，从而保证了它们在各种设备中的应用。KNNS–0.035BNKH– xm陶瓷具有光致发光性能的优点，在407 nm可见光激发下发出亮橙色。总体而言，KNNS-0.035BNKH- x Sm陶瓷由于其大的电致伸缩效应，出色的光致发光性能和长期稳定性而在多功能设备中具有广阔的应用前景。