Bismuth octaborate, Bi₂B₈O₁₅

Abstract

In the title compound, Bi(2)B(8)O(15), the Bi atom is coordinated to five or six O atoms. The B atoms exhibit two kinds of hybridization, sp(2) and sp(3), seen in the BO(3) triangles and BO(4) tetrahedra, respectively. Three BO(3) triangles are connected to form a B(3)O(6) planar ring. All atoms in the structure are connected together to form an infinite three-dimensional network.

Structural investigation of bismuth borate glasses and crystalline phases

“…A very interesting result from our density studies is the observation that density of Bi 2 O 3 -4B 2 O 3 glass (sample 1, d = 4.457 ± 0.002 g cm À3 ) is significantly greater than the density value of 4.152 g cm À3 for single crystals of bismuth octaborate phase (Bi 2 B 8 O 15 ) although both materials have same composition [16]. Similarly bismuth triborate glass (25Bi 2 O 3 -75B 2 O 3 , sample 2) has density of 4.815 ± 0.002 g cm À3 which is very close to the reported density of 4.896 g cm À3 for single crystals of bismuth triborate (BiB 3 O 6 ) phase [5].…”

“…These include at least five stable crystalline phases: Bi 24 B 12 O 39 (boron sillenite) [8,9], Bi 4 B 2 O 9 [8,10], Bi 3 B 5 O 12 [8,11], BiB 3 O 6 (bismuth triborate) [5,8,[12][13][14], Bi 2 B 8 O 15 (bismuth octaborate) [8,[15][16][17] and one metastable phase (that was missing in original phase diagram given in reference [8]): BiBO 3 (bismuth orthoborate), and its two polymorphs (BiBO 3 -I and BiBO 3 -II) [18][19][20]. A number of earlier studies have reported the density, thermal, optical and structural studies of Bi 2 O 3 -B 2 O 3 glasses [1,[21][22][23][24][25][26] and melts [27].…”

Structural properties of the boro-bismuthate glasses containing gadolinium ions

“…This bond is too long to be accepted as a chemical bond in the usual sense [27]. The irregular coordination is common for crystalline bismuth borate compounds [28] due to the lone electron pair. In general, it is simply assumed that the central bismuth cation holds a +3 charge by transferring the 6p 3 electrons to the boroxol rings.…”

Structural, electronic properties and charge density distribution of the LiNaB4O7: Theory and experiment

“…For example, BaB 2 O 4 , LiB 3 O 5 , CsB 3 O 5 , and YCa 4 (BO 3 ) 3 O are all well-known NLO crystals [13]. The binary Bi 2 O 3 eB 2 O 3 phase diagram has been investigated by Levin and McDaniel [14], and at least five compounds, Bi 24 B 2 O 39 [15], Bi 4 B 2 O 9 [16], Bi 3 B 5 O 12 [6], BiB 3 O 6 [17], and Bi 2 B 8 O 15 [18], have been proposed and structurally characterized. Among these, Bi 4 B 2 O 9 was reported to have high double refraction [19], Bi 3 B 5 O 12 displays stimulated Raman scattering and luminescence properties [20,21] and BiB 3 O 6 is the most extensively studied because it has been established as an NLO material with promising physical properties and has furthermore been characterized in detail with respect to their piezoelectric, pyroelectric, dielectric, elastic, and thermoelastic properties [22].…”