Structural and Mechanical Properties of Lithium Bismuth Borate Glasses Containing Molybdenum (LBBM) Together with their Glass-Ceramics

This study reports that MoO(3)doped glasses (LBB) are produced by a melting traditional process and using the XRD diffractometer technique to check their states. FTIR spectral analysis has examined the functional groups of the glass matrix. FT-IR spectrums reveal that the BO3, BO4. BiO(6)and MoO(6)octahedral have been built up and structural unit BO3 was transformed into BO4. The mechanical characteristics were linked to the FT-IR spectrum results. Ultrasonic velocities, elastic modulus, density, and thermal stability increased, while molar volume decreased. The increase in these parameters is linked with [BO4] the formation of structural units, an increase the strength of Mo - O, and force constant is higher than Li - O, so glass rigidity increases. Therefore, the increase of MoO(3)usually has a significant influence on the bridging oxygen (BO) formation in BBL glasses. The increase in thermal stability connected to an increase in average force constantly, and the replacement of Li-iO with Mo-O linkages. The bond dissociation energy of Li-Li (137.3 +/- 6.3 kJ/mol) is much weaker than the dissociation energy of Mo-Mo (449 +/- 1 kJ/mol). Lithium borate Li2B4O7(diomignite) has been identified in all formed glass-ceramics. With the increasing MoO3, the intensity of diomignite diffraction peaks (Li2B4O7) was reduced and transformed into a less stable lithium borate (Li2B2O5) phase.

Automated summary

The study shows that MoO(3)doped glasses exhibit improved mechanical properties and thermal stability, which can be attributed to the formation of [BO4] structural units, increased Mo-O strength, and the replacement of Li-iO bonds.