A new centrosymmetric modification of synthetic hilgardite Pb2[B5O9](OH) · 0.5H2O

Borate crystal chemistry in terms of the extended OD theory: topology and symmetry analysis

“…The condensation of this chain, as analyzed in [30], leads to block distortion and rotation. In the corrugated layer ( figure 14) the blocks are extended along the chain, as compared to larderellite.…”

Hierarchical Ba2(B5O9)Cl·(H2O)0.5 microspheres: surfactant-assisted facile hydrothermal synthesis, Tb3+ doping and photoluminescence properties

“…So far however, there have been just only a few of 3D hierarchical alkaline earth metal borates reported, including flowerlike Mg 3 B 2 O 6 , 10 hierarchical porous MgBO 2 IJOH) superstructures, 11 hierarchical laminar rhombic priceite (Ca 4 B 10 O 19 •7H 2 O) superstructures, 12 flower-like and urchin-like Mg 3 B 2 O 6 : Eu 3+ , 13 and LiMnBO 3 amorphous nanospheres. 14 In addition, hilgardite-like metal borates, such as M 2 B 5 O 9 X (M = Pb, Ca, Sr, Ba, Eu; X = Cl, Br, I, OH) [15][16][17][18][19][20][21][22][23] and M 2 IJB 5 O 9 )X•YIJH 2 O) (M = Pb, Ca, Ba; X = Cl, OH; Y = 0.5, 1) [24][25][26][27][28][29] containing both BO 3 triangles and BO 4 tetrahedra within the structure and thus exhibiting more complex boron-oxygen groups, have also been synthesized as nonlinear optical materials (NLO), which are widely employed in various fields based on their unique properties. Also as known, fluorescent materials synthesized by matrix borates have attracted worldwide attention because of their simple process, low cost, high fluorescence intensity and excellent mechanical properties.…”