Crystal growth, structure and optical properties of a new acentric crystal La₂Al_4.68B₈O₂₂ with a short UV absorption edge

Abstract

A new acentric borate La2Al4.68B8O22 crystal, grown using the top seeded solution growth method, shows a short absorption edge at 193 nm.

Molten Salt Synthesis of an Open-Frame Aluminum Phosphate Ba3Al2P4O16 with a Rare-Pyramidal AlO5 Group

“…With a proper size, the Al 3+ ion can be either 4-, 5-, or 6-coordinated to oxygen atoms in forming anionic groups with tetrahedral, triangular-bipyramidal, square-pyramidal, and octahedral geometries. Nevertheless, despite the rich coordination modes of Al–O groups, the most frequently observed ones are still tetrahedral AlO 4 , octahedral AlO 6 , and, to a somewhat lesser extent, trigonal-bipyramidal AlO 5 groups. − Especially, when it comes to inorganic crystals with a square-pyramidal AlO 5 group, to our best knowledge, very little related work has been reported besides HAl 2 B 3 O 8 and La 2 Al 4.68 B 8 O 22 , , providing much yet to be discovered.…”