Na_(2)B_(6)SO_(13) with unprecedented [B_(6)SO_(13)]_(∞) double chains and largest birefringence among borosulfates induced by the uniform arrangement of [B_(3)O_(7)] units  

作　　者：Jinbin Fan Ziting Yan Zilong Chen Huimin Li Zhihua Yang Fangfang Zhang Shilie Pan 

机构地区：[1]Research Center for Crystal Materials,State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions,Xinjiang Key Laboratory of Functional Crystal Materials,Xinjiang Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Urumqi 830011,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China Chemistry》2025年第2期475-480,共6页中国科学(化学英文版)

基　　金：supported by the National Key Research Project(2022YFE0134500);the West Light Foundation of Chinese Academy of Sciences(xbzgzdsys-202018);the CAS Youth Interdisciplinary Team(JCTD-2022-19);the National Natural Science Foundation of China(22335007,22361132544);the Tianshan Innovation Team(2022TSYCTD0005);the Xinjiang Major Science and Technology Project(2021A01001).

摘　　要：Birefringence is crucial for birefringent crystals to modulate polarized light and nonlinear optical crystals to enable phasematching.It is closely related to the arrangement of advantageous functional groups with large microcosmic polarizability anisotropy in the structure.Currently,designing crystals with large birefringence by modulating the arrangement of advantageous functional groups is still a challenge.In this work,the arrangement of the advantageous[B_(3)O_(7)]groups is optimized by introducing rigid tetrahedral[SO_(4)]groups,resulting in a novel boron-rich borosulfate,Na_(2)B_(6)SO_(13) ,which exhibits unprecedented[B_(6)SO_(13)]_(∞)double chain and an enhanced birefringence(Δn=0.07 at 589.3 nm)against the borate parent LiB3O5.Theoretical calculations confirm that the birefringence is mainly attributable to the uniform alignment of[B_(3)O_(7)]groups.Na_(2)B_(6)SO_(13) also possesses a deep ultraviolet(DUV)cutoff edge(λ<185 nm).This work provides a feasible method to design DUV birefringent crystals with large birefringence by inducing the arrangement of advantageous functional groups.

关 键 词：borosulfate deep ultraviolet BIREFRINGENCE modulated groups 

分 类 号：TN2[电子电信—物理电子学]