From β‐Na₂B₆O₁₀ to Na₃AlB₈O₁₅ and Na₃Al₂B₇O₁₅: Structural Tuning of Anionic‐Group Architectures by Substitution of [BO₄] by [AlO₄] Covalent Tetrahedra

Abstract

Two new sodium aluminum borates, Na3AlB8O15 and Na3Al2B7O15, have been successfully synthesized by the high‐temperature solution method. They crystallize in the different space groups, P21/c and P2/c, respectively. The B−O configurations of β‐Na2B6O10, Na3AlB8O15 and Na3Al2B7O15 are compared to feature complicated different dimensional open‐framework structures caused by the substitution of [BO4] by [AlO4] covalent tetrahedra. Moreover, the experimental results indicate that Na3AlB8O15 and Na3Al2B7O15 have short ultraviolet (UV) cutoff edges (<187 nm). The first‐principles calculations show that Na3AlB8O15 and Na3Al2B7O15 have moderate birefringence (0.075 and 0.041@1064 nm, respectively).

Structural Motif Cosubstitution Strategy for Designing Fluoroaluminoborate with the Sr2Be2B2O7-Type Double-Layered Structure

“…The Sr–O and Sr–F bond lengths in two crystallographically Sr–O/F polyhedranamely, [Sr(1)­O 9 F] and [Sr(2)­O 7 F 3 ]are in the ranges of 2.570(5)–3.201(5) and 2.378(4)–2.584(4) Å, respectively (see Table S3 in the Supporting Information). These values are in agreement with those of other reported aluminoborates. − Besides, the bond valence calculations for Sr (1.76–2.41), Al (2.88–3.28), B (2.98–3.28), O (1.82–2.10), and F (1.08–1.18) agree with theoretical values, which further verifies that the structural model is reasonable.…”

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

“…The UV cut-off edge is comparable to that of deep-UV transparent phosphates of Ba 11 [Al(PO 4 ) 4 ](P 2 O 7 )(PO 4 ) 3 , RbNaMgP 2 O 7 , 43 b and aluminium borates Na 3 AlB 8 O 15 , Na 3 Al 2 B 7 O 15 . 50 The IR spectrum showed a very high transmittance in the range of 4000–1600 cm −1 (2.50–6.25 μm) for Li 3 [Al(PO 4 ) 2 (H 2 O) 1.5 ] and 4000–1800 cm −1 (2.50–5.55 μm) for Na[AlP 2 O 7 ]. Optical band gaps were extrapolated from the absorption edge to baseline in the F ( R ) versus E diagrams.…”

Pb2Al2B3O8F3: structure and properties of a new fluoroaluminoborate with non-traditional chain-like B3O8 groups

“…It is comparable to that of other recently reported fluorooxoborates, such as 0.062@1064 nm for Na 2 B 6 O 9 F 2 , 0.0685@1064 nm for PbB 5 O 8 F, 0.06@1064 nm for Na 3 B 7 O 11 F 2 , 0.041@1064 nm for Na 3 Al 2 B 7 O 15 etc. 54–57…”