AZn₂(BO₃)Si₂O₅ (A = Rb, Cs): first examples of KBe₂BO₃F₂ structure type in the borosilicate family exhibiting a deep-ultraviolet cutoff edge

Abstract

Design and synthesis of nonlinear optical (NLO) crystals are of crucial significance owing to their pivotal role in solid-state lasers. Two dimensional (2D) [Be2BO3F2]∞ layers in the famous borate fluoride...

Ba6Zn6(B3O6)6(B6O12): Barium Zinc Borate Contains π-Conjugated [B3O6]3– Anions and [B6O12]6– Anion with Edge-Sharing BO4 Tetrahedra

“…The peaks at 541 and 452 cm –1 belong to the bending of BO 3 , BO 4 , and ZnO 4 . These assignments are consistent with those previously reported. − …”

“…All six Zn 2+ atoms are tetrahedrally coordinated with Zn–O distances of ZnO 4 tetrahedra with bond lengths between 1.884(4) and 2.095(9) Å. These bond distances are consistent with other zincoborates reported previously. − …”

“…Although some of the zincoborates reported, such as ZnB 4 O 6 F 2 (204.96 nm, 0.101@1064 nm), and CaZn 2 (BO 3 ) 2 (<190 nm, 0.081@546 nm), have excellent birefringence and can achieve UV transmission, most zincoborates are much smaller than β-BBO (0.113 at 1064 nm) (see in Table ). − According to the anionic group theory, the number densities of π-conjugated BO 3 units have an equivalent effect on the optical properties. ,, In addition, the best parallel arrangement of the π-conjugate B–O units ([B 3 O 6 ] 3– and [B 6 O 12 ] 6– ) can make the maximum contribution to the optical anisotropy and birefringence. Therefore, it is hoped that the zincoborates will have larger birefringence if we increase the densities of the π-conjugated BO 3 or B 3 O 6 groups in their structures and these groups are in parallel packing fashion.…”

Li3[Al(PO4)2(H2O)1.5] and Na[AlP2O7]: from 2D layered polar to 3D centrosymmetric framework structures

“…As shown in Fig. 3a, the simplified anionic network of NaijAlP 2 O 7 ] can be described as a 2-nodal net topological type with a point symbol 17 {4 2 •6}2{4 4 •6 2 •8 8 •10}, which belongs to an ant/anatase topological type 48 (see Fig. 3a).…”

“…[1][2][3][4][5][6][7] In particular, ultraviolet (UV) NLO crystals work in the region of wavelength λ ∼ 300 nm, or even the deep-ultraviolet region (DUV, λ ≤ 200 nm). [8][9][10][11][12] Deep-UV laser light sources have been widely used in several key fields, such as laser processing technology, biomedicine, precision scientific research equipment, and laser high-resolution lithography. Therefore, compared with UV NLO materials, research into their deep-UV counterparts is a current domestic and international research hotspot.…”