The role of different alkaline earth oxide composition in copper borate glasses: Structure and optical properties

Deciphering the structure and potassium-ion transport mechanism of potassium borate glass

“…19,20 Wright et al 21 − /NBO ratios, alkali and alkaline earth metal cations primarily act as "network formers", while at higher NBO contents, they primarily act as "network modifiers". [23][24][25][26] Furthermore, at higher NBO contents, the main oxygen atoms in B∅ 4 − units are also NBOs. 23 An increase in B∅ 4 − content in this glass helps to enhance its thermal and mechanical stability, while an increase in NBO results in denser glass, 27 because the B-NBO bond is longer than the B-BO bond.…”