An investigation into the morphology and crystallization process of lithium borate glass containing vanadium oxide

材料科学 玻璃化转变 硼酸盐玻璃 结晶 硼酸锂 退火(玻璃) 陶瓷 微晶 多孔玻璃 无定形固体 复合材料 锂(药物) 矿物学 分析化学(期刊) 化学工程 冶金 结晶学 聚合物 兴奋剂 工程类 化学 光电子学 有机化学 色谱法 多孔性 医学 内分泌学
作者
Ahmed H. Hammad,Mohamed Sh. Abdel-wahab,Sajith Vattamkandathil
出处
期刊:Journal of materials research and technology [Elsevier]
卷期号:16: 1713-1731 被引量:6
标识
DOI:10.1016/j.jmrt.2021.12.131
摘要

A series of lithium borate glasses with V2O5 were successfully prepared by melt annealing. The glass-ceramics were made by heating the glass to the glass transition temperature (Tg), then heating it to the crystallization temperature (Tc), converting it from a vitreous state to a crystalline state. This study found a link between the glass transition (Tg) and V2O5 ratio in the host glass, with Tg rising from 345 °C for base glass to 419 °C for glass containing 2% V2O5. The glass stability of the base sample was higher than that of the V2O5 samples. XRD analysis revealed the main crystalline phase in the derived glass-ceramics to be Li2B4O7 tetragonal, with crystalline traces of Li2B2O4.16H2O phase. Similarly, crystallite growth on plane (112) decreased from 253 Å (the base) to 239 Å (2% V2O5). Vitreous structure was existed in the glass samples, while spherical particles were found in the derived glass-ceramic materials. The spherical particles began to take on large geometric shapes as the V2O5 content increased from 1% to 2%. All glass-ceramic samples have traces of vitreous material. Glass and glass-ceramics with structural units of BO3, BO4, boroxol rings, and B–O–B linkages were also presented. The phonon-energy (Eph) and optical transition (Eg) showed a strong correlation with V2O5 content. As V2O5 increased between the conduction and valence bands, Eph increased from 99 to 232 meV and Eg decreased from 3.164 to 2.250 eV.

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