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LiBa3Al2B3O11: a deep-ultraviolet transparent optical borate featuring a 2D [Al2B3O11]∞ layered structure
Shuangyue Shang1,2, Fan Liu1,2, Lei Kang1
1Beijing Center for Crystal Research and Development, Technical Institute of Physics and Chemistry (TIPC), Chinese Academy of Sciences, Beijing 100190, China. xywang@mail.ipc.ac.cn.
None:
Borates have garnered significant attention due to their rich structural diversity and versatile applications, particularly in the ultraviolet (UV) and deep-ultraviolet (DUV) transparent optical regions. In this study, a new aluminum borate, LiBa3Al2B3O11, was successfully synthesized for the first time. Its structural framework consists of interconnected [BO3]3- triangles and [Al2O6]∞ chains, with Ba and Li atoms occupying the interstitial sites. Within the a-c plane, the crystal features two-dimensional [Al2B3O11]∞ layers composed of 16-membered rings (Al2B2O6), which remains a unique structure motif among aluminum borates. Experimental results confirmed a UV transmission cut-off edge below 200 nm, indicating its potential for applications in DUV optics.
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