BaLa(SiS)(BS): Structurally Ordered Thioborate-Thiosilicate Obtained by Adjusting the Cationic Size.

Inorg Chem

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.

Published: March 2025


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Article Abstract

Thioborates are of interest as nonlinear optical materials, birefringent materials, and solid-state electrolytes. Under the dilemma that all known thioborate-thiosilates are disordered structures with co-occupied atomic sites, the first structurally ordered thioborate-thiosilicate, BaLa(SiS)(BS), has been successfully obtained by adjusting the cationic size. It features a novel 3D tunnel network assembled by La-B-S chains and La-Si-S bilayers. In addition, BaLa(SiS)(BS) exhibits good chemical and thermal stability (up to 880 °C), wide light transmission range (0.4-11 μm), wide band gap (3.25 eV), moderate birefringence (0.076 @ 546 nm), and high laser-induced damage threshold (6 × AgGaS). Theoretical calculations showed that the [BS] functional group is the main contributor to birefringence. This work enriches the structure types of thioborate-thiosilicate and expands insights into mixed anionic thioborates.

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http://dx.doi.org/10.1021/acs.inorgchem.5c00083DOI Listing

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