期刊
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
卷 31, 期 3, 页码 1057-1065出版社
SPRINGER
DOI: 10.1007/s10904-020-01708-1
关键词
Glasses; Structural; Mechanical; Glass-ceramic
资金
- Deanship of Scientific Research at King Khalid University [R.G.P. 2/93/41]
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.
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.
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