Bi4B2O9—crystal growth and some new attractive properties

Structural investigation of bismuth borate glasses and crystalline phases

“…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]. The density of 2Bi 2 O 3 -B 2 O 3 glass (66 mol% of Bi 2 O 3 , sample 14, d = 7.765 ± 0.020 g cm À3 ) is again close to the density of 8.208 g cm À3 for single crystals of Bi 4 B 2 O 9 (monoclinic) phase (66 mol% Bi 2 O 3 ) [10]. These observations are very unusual as conventionally volume of glassy phase is higher than its crystalline phase of equal composition.…”

“…(11). The second peak at 672°C is the melting peak of Bi 4 B 2 O 9 phase [8,10]. Finally, the last glass sample (sample 14) containing 66 mol% of Bi 2 O 3 exhibits only one crystallization peak at 370°C and, one very sharp melting peak at 680°C.…”

“…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].…”

Room, low, and high temperature dehydration and phase transitions of kernite in vacuum and in air

“…Due to their high glassforming ability, excellent nonlinear optical properties (β- [1][2][3][4][5] and BiB 3 O 6 [6][7][8]), piezoelectricity (Li 2 B 4 O 7 [9]), high double-refraction (Bi 4 B 2 O 9 [10]) and luminiscence properties (Bi 3 B 5 O 12 [11]) borates are considered nowadays as highly promising materials for technical applications. Recently hydrated sodium tetraborates, Na 2 B 4 O 5 (OH) 4 ·3H 2 O (tincalconite) and K 2 B 4 O 5 (OH) 4 ·2H 2 O [12], were studied as the promising materials for piezoelectricity, linear electro-optic effect and the generation of the second harmonic of laser radiation [13].…”

Synthesis, crystal structure, spectrum properties, and electronic structure of a novel non-centrosymmetric borate, BiCd3(AlO)3(BO3)4

“…Among them, Bi 4 B 2 O 9 was reported to have high double-refraction [9], Bi 3 B 5 O 12 displays stimulated Raman scattering and luminescence properties [10,11], and BiB 3 O 6 is the most extensively studied because it has been established as a NLO material with promising physical properties [12]. Theoretical studies have shown that the presence of irregular Bi-O coordination polyhedra and their favorable structural arrangement lead to the extraordinarily large optical SHG effect in BiB 3 O 6 [13].…”