A位阳离子调制对KSr2Nb5O15基陶瓷光致变色行为的影响

Due to the inherent chromogenic response limitation， the further development of conventional photochro• mic materials in applications such as multi-dimensional information storage and dynamic anti-counterfeiting has been restricted.To address the issue of monotonous photochromism in KSr 2 Nb 5 O 15 -based ceramics， this work proposes a structural tuning strategy via A-site cation modification.The KSr 2+x Nb 5 O 15+δ ceramic system was prepared by tuning the K + /Sr 2+ ratio， and the effects of Sr 2+ content variations on the microstructures and photochromic properties of sam • ples were systematically investigated.The results reveal that Sr 2+ content significantly influenced the crystal lattice structure， oxygen vacancy concentration， and trap distribution， thereby modulating the environmental size around the color centers.By increasing the Sr 2+ content， the sizes around photochromic color centers were regulated， and the characteristic light absorption in red spectral range(550 nm to 750 nm) was significantly enhanced after photochro• mic reaction， enabling controlled modulation of the photochromic behavior.This work proposed a novel approach and experimental foundation for modulating the properties of inorganic photochromic materials.Keywords： photochromic； ceramics； KSr 2 Nb 5 O