Boroxol groups in vitreous boron oxide: new evidence from neutron diffraction and inelastic neutron scattering studies

Thermal and optical properties of glasses of the system Bi2O3 – B2O3

“…The above results can be set into relation to structural information on bismuth borate glasses derived by spectroscopic studies, but also the structures of the crystalline compounds that occur in the composition range that was studied in this work should be kept in mind. The main structural features of bismuth borate glasses that are commonly accepted can be summarized as follows: In pure B 2 O 3 glass most of the boron is involved in [B 3 O 6 ] boroxol rings [8]. [11,13,20,21,25].…”

“…However, other borate systems may behave differently, an example to illustrate this is the congruently melting boron oxide, B 2 O 3 : Crystals of B 2 O 3 consist of chains of corner-sharing [BO 3 ] triangles, linked to ribbons in the crystal structure [7]. For the corresponding glass and melt, however, the current model claims the predominant presence of [B 3 O 6 ] boroxol rings [8]. Consequently, it is not possible to grow crystals of B 2 O 3 by inserting a seed crystal into a supercooled melt of B 2 O 3 even over a period of several months.…”

La structure des verres étudiée par diffraction des neutrons

“…En particulier, des informations structurales quantitatives sur les formateurs de réseau et le réseau polymérique peuvent être obtenues grâce aux fonctions de corrélation totale, dans lesquelles les paires associées à la matrice vitreuse sont dominantes. Les verres de silice et de bore ont été largement étudiés par cette méthode [40].…”

Boria Effects on the High Temperature Oxidation of Silicon Carbide

“…The v-B2O3 structure has been under considerable debate [47][48][49][50] . Neutron diffraction experiments conducted by Hannon et al supported previous findings that the majority of B atoms make up planar B3O6 boroxol ring structural units and the remaining B atoms make up BO3 triangular structural units 47 . The neutron diffraction results determined 80% of B atoms were occupied in boroxol rings 47 .…”

“…Boria is mainly found in the vitreous state (v-B2O3) 46 and is comprised of trigonally coordinated BO3 units 47 . The v-B2O3 structure has been under considerable debate [47][48][49][50] .…”