Ba₄Bi₂(Si_8−xB_4+xO₂₉) (x = 0.09): a new acentric metal borosilicate as a promising nonlinear optical material

Abstract

A novel acentric metal borosilicate, Ba4Bi2(Si8–xB4+xO29) (x = 0.09), exhibits the strongest NLO effects in borosilicates.

Key Factors Controlling the Large Second Harmonic Generation in Nonlinear Optical Materials

“…This analysis carried out for LiCs 2 PO 4 (LCPO) , showed that the contributions of the metal cations (particularly, a large polarizable metal cation such as Cs + ) to the SHG response are significant. This finding has been supported by recent experimental studies on new NLO materials. − This observation prompts us to see if large polarizable metal cations such as Ba 2+ , Cs + , and K + also play an important role in the SHG responses of the well-known NLO borates β-BaB 2 O 4 (BBO), LiB 3 O 5 (LBO), CsB 3 O 5 (CBO), CsLiB 6 O 10 (CLBO), and KBe 2 BO 3 F 2 (KBBF), which were studied in the past by the anionic group theory (AGT). ,, These borates are very important for technical applications (see Section S1 in the Supporting Information for details).…”

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

“…21–28 Anionic group combinations not only initiate structural diversities, but also modulate the physio-chemical properties of the NLO crystals. Within the mixed anions based NLO crystal classes, inorganic borate derivatives were enthusiastically explored, by involving boron-based anionic units into other systems, a new set of NLO materials classes can be obtained, such as borophosphates, 29,30 borogermanates, 31 borosilicates, 32,33 borosulfates, 34,35 borate–iodates, 36,37 and so on. Among the above classes, borophosphates captured relatively early attention, and some promising results were achieved.…”

“…Subsequently, other novel borosilicate UV NLO crystals have been unearthed, such as Ba 4 (BO 3 ) 3 (SiO 4 )·Ba 3 X (X = Cl, Br) (1 × KDP), 40 CsSiB 3 O 7 (0.8 × KDP), 41 and LaBSiO 5 (1.1 × KDP). 42 Furthermore, owing to the corporative effect of the anionic and cationic polyhedral units in Ba 4 Bi 2 (Si 8− x B 4+ x O 29 ) ( x = 0.09), 33 the largest SHG response (5.1 × KDP) among the known borosilicates was achieved. These studies suggest that borosilicates are also plausible candidates for NLO applications and are worthy of further exploration.…”

A new barium-containing alkali metal silicate fluoride NaBa3Si2O7F with deep-UV optical property

“…More recently, considerable advanced applications of silicates in catalysis, molecular sieves, microelectronics, biomedicine, phosphors, laser hosts and ceramic materials have been established [11][12][13][14][15][16][17]. Generally, the immensely wide applications of silicates are derived from the diversity of their properties, which are essentially determined by their luxuriant structures [18][19][20][21][22][23]. For example, the artificial compounds Yb 3+ : [24][25][26][27][28].…”