Syntheses and crystal structures of two pentaborates, Na3CaB5O10 and Na3MgB5O10

Synthesis, crystal structure, and optical properties of a novel pentaborate, K2NaZnB5O10

“…The B-O bond lengths in the tetrahedron range from 1.460 (5) (Table 3). These geometric parameters are in good agreement with those observed in the 4 known borates containing similar B 5 O 10 units [9,19,20,27,28]. BVS values for B atoms are also reasonable, lying in the range 3.01-3.09.…”

“…Several other pentaborates with similar formula of Na 3 MB 5 O 10 (M = Mg, Ca, Sr, and Zn) have been previously reported [9,19,20,27,28] and the overall structural information can be summarized as follows: (i) Na 3 CaB 5 O 10 has a superstructure, with the cell volume being about two times of that of the Sr analog. Their crystal structures have zero-dimensional character consisting of discrete [B 5 O 10 ] 5− anions separated by 6-coordinate Ca 2+ or Sr 2+ as well as 5-, 6-and 7-coordinate Na + cations.…”

The new pentaborate Na3SrB5O10

“…The structure of Na 3 CaB 5 O 10 was first reported by Fayos et al (1985). A recent study found that it had a superstructure (Chen, Li, Zuo et al, 2007) with a cell volume twice that reported previously. The present Sr-containing structure has a cell similar to that of the previously reported Ca-containing structure.…”

“…To date, four pentaborates have been described, namely Na 3 MgB 5 O 10 (Chen, Li, Zuo et al, 2007), Na 3 CaB 5 O 10 (Fayos et al, 1985;Chen, Li, Zuo et al, 2007), Na 3 SrB 5 O 10 (this work) and Na 3 ZnB 5 O 10 . The structure of Na 3 CaB 5 O 10 was first reported by Fayos et al (1985).…”

Synthesis, crystal structure and optical properties of a novel sodium lead pentaborate, NaPbB5O9

“…Moreover, anionic radicals in the borate class can be both B-tetrahedra and B-triangles, and the BO 3 and BO 4 groups may be further linked via common oxygen atoms to form isolated rings and cages or polymerize into infinite chains, layers and networks, leading to the rich structural chemistry [4,5]. Since a series of alkali-metal or alkaline-earth metal borate, such as LiB 3 O 5 (LBO) [6], CsB 3 O 5 (CBO) [7,8], CsLiB 6 O 10 (CLBO) [9], b-BaB 2 O 4 (BBO) [10] and KBe 2 BO 3 F 2 (KBBF) [11] are useful NLO materials for efficient SHG of Nd:YAG lasers, these induced a considerable interest in search for new promising compounds in ternary borate systems M 2 O-M 0 O-B 2 O 3 (M¼ alkali-metal and M 0 ¼Mg, Ca, Sr, Ba, Zn, and Cu) [12][13][14][15][16][17][18][19][20][21].…”