Growth, Crystal Structures, and Characteristics of Li₅ASrMB₁₂O₂₄ (A = Zn, Mg; M = Al, Ga) with [MB₁₂O₂₄] Frameworks

Abstract

Two aluminoborates (Li5ZnSrAlB12O24 and Li5MgSrAlB12O24) and one galloborate (Li5ZnSrGaB12O24) were successfully obtained for the first time, and the centimeter-sized crystals were grown by the Kyropoulos method. These crystals possess the [MB12O24] (M = Al, Ga) basic frameworks in their crystal structures, and the [GaB12O24] framework is a new framework in galloborates. The synthesis, single crystal growth, characterizations, and theoretical calculation are reported for these compounds.

Transformation of the B–O Units from Corner-Sharing to Edge-Sharing Linkages in BaMBO4 (M = Ga, Al)

“…Assignments of the respective IR peaks are listed in Table . The results indicate that only the [BO 3 ] 3– units exist in GaBO 4 , while BaAlBO 4 contains both [BO 3 ] 3– and [BO 4 ] 5– units. − It is difficult to undoubtedly distinguish the absorption peaks below 600 cm –1 on account of the overlaps of the stretching modes of M–O (Al, Ga) groups and the bending modes of B–O groups in the low frequency vibrations. − …”

Two layered galloborates from centric to acentric structures: syntheses and NLO properties

“…Similar frameworks appear in the isostructural Li 5 ASrMB 12 O 24 (A = Zn/Mg; M = Al/Ga). 44 Fifth, MO n (M = Al/Ga, n = 4, 5) groups can also be the bridging groups of 3D porous layers, joining single/mixed oxoboron clusters together to form porous layers, such as [H 3 O]K 3.52 Na 3.48 -{Al 2 [B 7 O 13 (OH)][B 5 O 10 ][B 3 O 5 ]}[CO 3 ], 11 Ba[MB 4 O 8 (OH)]·H 2 O (M = Al/Ga) 26 and Ba 3 M 2 [B 3 O 6 (OH)] 2 [B 4 O 7 (OH) 2 ] (M = Al/Ga) 31 (Fig. S6e, ESI†).…”

Two New Ferroborates with Three‐Dimensional Framework and Wide Transmittance Window

“…In the basic structures of borates, there are two types of [BO] units, which are three‐coordination [BO 3 ] triangles and four‐coordination [BO 4 ] tetrahedra. Moreover, the [BO 3 ] triangles and [BO 4 ] tetrahedra can further combine to form the [BO] clusters, chains, layers, and frameworks by sharing corner O atoms . Besides, [BO 4 ] tetrahedra can also connect with each other by sharing edge O atoms .…”

“…Inspired by the above ideas, simple substitution was adopted in exploring new ferroborates. As Al 3+ and Fe 3+ cations own the similar radii and the same charge, we replaced the Al sites with Fe in Li 5 MSrAlB 12 O 24 (M = Mg, Zn) and successfully obtained two new ferroborates Li 5 MSrFeB 12 O 24 (M = Mg, Zn). In this work, the syntheses, crystal growth, and crystal structures of Li 5 MSrFeB 12 O 24 (M = Mg, Zn) were discussed in detail.…”