Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

The Indium Borate In19B34O74(OH)11 with T2 Supertetrahedra

“…Details of the crystal data and structure refinement as well as the lattice parameters obtained from powder diffraction data can be found in Table 1. The pecularity of this structure are adamantane-like B 4 O 10 supertetrahedra, 6 which to the best of our knowledge only occurred in the borosilicate Cs 2 B 4 SiO 9 4 so far. Thus, In 19 B 34 O 74 (OH) 11 is the first borate to show this structural motif, which is described in detail later in this paper.…”

“…1−3 Recently, Wu et al reported on a borosilicate that shows an association of four BO 4 tetrahedra forming a large B 4 O 10 tetrahedron. 4 Until then, this B−O building block has only been predicted in borate chemistry. 5 However, this structural motif is well-known in sulfides (GeS 2 ) and nitrides (Li 10 P 4 N 10 ) and is called a "supertetrahedron".…”

High-Temperature, High-Pressure Hydrothermal Synthesis, Crystal Structure, Thermal Stability, and Solid State NMR Spectroscopy of an Aluminum Borate, Ba[AlB4O8(OH)]

“…For example, substitution of Be for Al creates the new NLO crystals Rb 3 Al 3 B 3 O 10 F and K 3 Ba 3 Li 2 Al 4 B 6 O 20 F. 4,5 Other beryllium-free borates include a mixed-alkali metals borate Li 4 Sr(BO 3 ) 2 , 6 a zinc borate-phosphate Ba 3 (ZnB 5 O 10 )-PO 4 , 7 and a borosilicate Cs 2 B 4 SiO 9 . 8 All of these borate crystals were grown from fluxes at high temperature. The hydrothermal method is also able to produce crystalline phases which are not stable at the melting point and is particularly suitable for the growth of good quality crystals of silicates, phosphates, and borates.…”

Ba2NaClP2O7: Unprecedented Phase Matchability Induced by Symmetry Breaking and Its Unique Fresnoite-Type Structure

“…Great interest has been focused on the searching of new noncentrosymmetric (NCS) compounds that exhibit efficient nonlinear optical (NLO) properties, especially in the deep UV (DUV) region (wavelength below 200 nm). − Although a NCS structure is the necessary but not always sufficient crystallographic requirement for second-harmonic generation (SHG), the fundamental understanding of the structure–property relationships, including crystallographic structure, bonding, and electronic band structure features that support efficient SHG response, is the solid base of the design of new NLO materials.…”