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Ba5Zn4(B3O6)2(B12O24): A Borate with Edge-Sharing [BO4] Tetrahedral Connection by Introducing Zn into β-BaB2O4
Kaitong Liu1, Yuan Rao1, Zhaoxue Li1
1Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials, School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi, Xinjiang 830054, China.
Abstract:
The edge-sharing connection mode of [BO4] tetrahedra has greatly enriched the structural chemistry of borates, which provides more options and possibilities for designing more materials with unique structures and excellent performance. A zinc borate Ba5Zn4(B3O6)2(B12O24) (BaZnBO) was synthesized via a high-temperature solid reaction. Its uniqueness lies in not only introducing Zn into the structure of β-BaB2O4 but also containing the unusual edge-sharing [BO4] tetrahedra. The functional building units are isolated [B3O6] and [B12O24] groups. The adjacent [B3O6] groups are linked to a layer in the ab plane and further stack along the [001] direction, while the [B12O24] groups are located in the middle of these layers, thus forming the "sandwich" structure. This work also analyzed the impact of introducing Zn into β-BaB2O4 on the structure of anions. In addition, BaZnBO also exhibits good thermal stability and excellent optical properties including the short cut-off edge (204 nm) and suitable birefringence (0.058@1064 nm).
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