CsB₃O₄(OH)₂: a new deep-ultraviolet birefringent crystal with [B₃O₄(OH)₂] anionic group

Abstract

A new cesium hydroxyborate CsB3O4(OH)2, was designed and synthesized by the hydrothermal method. Remarkably, CsB3O4(OH)2 presents novel [B3O4(OH)2]∞ chains formed by [B3O4(OH)2] fundamental building block (FBB). The report of less...

Extending Unique 1D Double-Chains to 2D Layers with Birefringent Gain by Introducing a Hydroxyl Group

“…So, KB5 exhibits a considerable band gap (approximately 7.72 eV) and birefringence (about 0.06). During our investigation of the system above, numerous borates containing hydroxyl groups characterized by outstanding properties or unique structures have been successfully synthesized, such as AE B 8 O 15 H 4 ( AE = Ca, Sr) [ E g = 7.43 and 7.02 eV; SHG = 2 and 1.8 × KH 2 PO 4 (KDP); Δ n = 0.093 and 0.087, respectively], Ba 2 [B 6 O 9 (OH) 4 ] (3 × KDP), Ba 2 [B 4 O 7 (OH) 2 ] (2.2 × KDP), NaSr 3 (OH)­(B 9 O 16 )­[B­(OH) 4 ] (3 × KDP), CsB 3 O 4 (OH) 2 (Δ n = 0.09), Li 2 CsB 7 O 10 (OH) 4 (2.5 × KDP), etc.…”

“…NaSr 3 (OH)(B 9 O 16 )[B-(OH) 4 ] (3 × KDP),26 CsB 3 O 4 (OH) 2 (Δn = 0.09),27 Li 2 CsB 7 O 10 (OH) 4 (2.5 × KDP),28 etc.Based on the above series of hydroxyborates with excellent properties, the hydroxyborate system is worthy of further study. Compared with the traditional borate system, the type i v i du a l n o t d i r e c t l y a s s o c i a t e d w i t h s c i t e i s p r o h i b i t e d .…”

NaB(OH)3CH3: a deep-ultraviolet optical crystal with unprecedented methyl-modified [B(OH)3CH3] units

“…Hydroxyborates can simultaneously enhance the gap and improve the birefringence compared with classic borates, which are also potential DUV materials. [31][32][33][34][35][36][37][38][39][40][41] Hydroxyfluorooxoborates composed of DUV [B-O-F/OH] units as new potential candidates have been proposed and confirmed. [42][43][44][45][46][47] These new deep UV units in borates provide raw materials for exploring new potential DUV materials.…”

K5[B3O3F4(OH)]2(NO3): the first hydroxyfluorooxoborate-nitrate with a short ultraviolet cutoff edge and large birefringence

“…17 This is primarily attributable to the introduction of F atoms, which can transform [BO 4 ] tetrahedra to [BO x F 4− x ] ( x = 1–3) distorted tetrahedra with greater optical anisotropy, and optimize the arrangement of functional modules in the lattice to gain the parallel arrangement [BO 3 ] group with high density. 17 After a long period of exploration, many excellent crystals with large birefringence have been discovered in the hydroxyborate and fluorooxoborate systems, such as NH 4 B 11 O 16 (OH) 2 , CsB 3 O 4 (OH) 2 , AB 4 O 6 F (A = NH 4 , Na, Rb, Cs), and MB 5 O 7 F 3 (A = Ca, Sr, Pb), 18–20 implying that introducing mixed anion groups is effective for exploring birefringent materials.…”