Transparent ceramics with good electrical performance have recently drawn broad interest as promising multifunctional materials. Here, we report that a superior transmittance (T = 75 % at 2000 nm) and good piezoelectricity (d₃₃ ∼ 150 pC/N) can be simultaneously realized in 0.93K_0.5Na_0.5NbO₃-0.07SrZrO₃ (KNN-SZ) ceramics by Li₂O regulation. The effect of Li₂O regulation has two parts: first, the presence of Li₂O facilitates the grain growth of KNN-SZ, considering that it melts at a relatively low temperature as a proper sintering aid; second, the introduced Li⁺ causes local lattice distortion, resulting in the coexistence of orthogonal and tetragonal (O–T) phases. The enlarged grains reduce the light scattering by grain boundaries for a higher optical transmittance; meanwhile, large grains stand as a prerequisite for the macroscopic domain structure favoured for decent piezoelectricity, which could also be partly caused by the coexistence of O–T phases. We believe that these findings might make KNN-based ceramics a preferable candidate for optoelectronic devices.

具有良好电性能的透明陶瓷近来作为有前景的多功能材料引起了广泛的兴趣。在此，我们报道了优异的透射率（Ť在2000纳米= 75％）和良好的压电（d ₃₃〜150 PC / N）可以以0.93K同时实现_0.5的Na _0.5 NbO的₃ -0.07SrZrO ₃（KNN-SZ）陶瓷按Li ₂ O规定。Li ₂ O调节的作用包括两个部分：首先，考虑到Li ₂ O作为合适的烧结助剂在较低的温度下熔化，Li ₂ O的存在有助于KNN-SZ的晶粒长大。二，李⁺介绍引起局部晶格畸变，从而导致正交和四方（共存O-叔）相。增大的晶粒减少了晶界引起的光散射，从而提高了透光率。同时，大晶粒是获得良好压电性的宏观畴结构的先决条件，这也可能部分由O-T相的共存引起。我们相信，这些发现可能会使基于KNN的陶瓷成为光电子器件的首选。