Two mixed alkali-metal fluorooxoborates, Li₂KB₅O₈F₂ and Li₂NaB₅O₈F₂, were designed and synthesized by using the strategy of targeted dimensional modulation through adjusting component ratio in the sealed system. Li₂KB₅O₈F₂ exhibits a short ultraviolet cutoff edge (<196 nm), possessing moderate birefringence (about 0.05@1064 nm) which was mainly contributed by the ${}_{\infty }{}^2\left[{\mathrm{B}}_5{\mathrm{O}}_8{\mathrm{F}}_2\right]$ wave layer. Further, the investigation on the relationship among (A^I + F)/B (A^I: alkali-metal cations) ratio and dimensionality of the anionic framework as well as birefringence has been conducted in available anhydrous alkali-metal fluorooxoborates for providing an idea in the synthesis of fluorooxoborates with desirable performances.

两种混合碱金属氟代硼酸盐Li ₂ KB ₅ O ₈ F ₂和Li ₂ NaB ₅ O ₈ F ₂采用在密封体系中通过调整组分比例进行定向尺寸调制的策略设计合成。Li ₂ KB ₅ O ₈ F ₂具有短的紫外截止边(<196 nm)，具有中等的双折射(约0.05@1064 nm)，这主要是由${}_{\infty }{}^{\mathrm{2个}}\left[{\mathrm{乙}}_{\mathrm{5个}}{\mathrm{欧}}_{\mathrm{8个}}{\mathrm{F}}_{\mathrm{2个}}\right]$波层。此外，在可用的无水碱金属氟代硼酸盐中，对 ( A ^I  + F)/B ( A ^I : 碱金属阳离子) 比率和阴离子骨架的维数以及双折射之间的关系进行了研究，以提供一个想法在具有理想性能的氟代硼酸盐的合成中。