Crystal Structures and Properties
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Abstract
Abstract
Abstract Current birefringent crystals (e.g., MgF2, α-BBO, and YVO4) are limited by either small birefringence or insufficient deep-UV transparency. Achieving both properties simultaneously remains a key challenge. To address this issue, recent research based on the “confined π-conjugated” strategy has turned its attention to fluoroaluminoborates. In this structural design, non-π-conjugated [Al−O/F] units connect and isolate planar π-conjugated groups, effectively broadening the bandgap while maintaining optical anisotropy. Building on this concept and incorporating different cations, this study reports two new fluoroaluminoborate compounds: CaAlB3O6F2 (CABOF) and its isostructural analogue, PbAlB3O6F2 (PABOF). In PABOF, the introduction of Pb2+ induces local structural distortion, thereby enhancing the optical anisotropy. Both CABOF and PABOF exhibit birefringence values exceeding 0.1 at 546 nm, with PABOF demonstrating the largest birefringence among the known fluoroaluminoborates. In addition, both compounds exhibit excellent thermal stability. This work identifies two potential UV-birefringent materials, further enriching the fluoroaluminoborate family.
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@article{Li2026MAlB3O6F2,
title = {MAlB3O6F2 (M = Ca and Pb): Two New Fluoroaluminoborates Featuring π-Conjugated [BO3] and [AlO4F2] Units with Large Birefringence},
author = {Yaozu Li and Chao Wei and Wenjing Zhang and Huiyi Zhang and Bo Zhao and Bingbing Zhang and Ying Wang},
journal = {Crystal Growth & Design},
year = {2026},
doi = {10.1021/acs.cgd.6c00931},
url = {https://doi.org/10.1021/acs.cgd.6c00931}
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