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Network Structure and Properties of Lithium Aluminosilicate Glass
Shoujia Huang1, Wenzhi Wang1, Hong Jiang1,2
1State Key Laboratory of Marine Resources Utilization in South China Sea and Special Glass Key Lab of Hainan Province, Hainan University, Haikou 570228, China.
Materials (Basel, Switzerland)
|July 9, 2022
Summary
Optimizing lithium aluminosilicate glass by adding boron oxide enhances its polymerization and connectivity. This modification improves thermal stability, hardness, density, and chemical durability, making it suitable for advanced applications.
Area of Science:
- Materials Science
- Glass Science
- Solid State Chemistry
Background:
- Lithium aluminosilicate glasses are crucial in various technological applications.
- Understanding the structure-property relationships is essential for material optimization.
- The role of boron oxide (B2O3) in modifying glass networks requires further investigation.
Purpose of the Study:
- To investigate the effect of substituting silicon dioxide (SiO2) with boron oxide (B2O3) in lithium aluminosilicate glass.
- To analyze the structural changes and their impact on the thermomechanical and chemical properties of the glass.
- To optimize glass composition for enhanced performance.
Main Methods:
- Systematic variation of B2O3 concentration (0-6.5 mol%) in lithium aluminosilicate glass.
- Structural analysis using spectroscopic techniques to determine coordination states of Al and B.
- Characterization of thermomechanical properties, including thermal expansion coefficient and Vickers hardness.
- Evaluation of chemical durability in acidic (HF) and alkaline (NaOH, KOH) solutions.
Main Results:
- Aluminum oxide (Al2O3) consistently maintained four-coordinated [AlO4] structures.
- Boron oxide (B2O3) predominantly incorporated as four-coordinated [BO4] units.
- Silicon-oxygen-silicon (Si-O-Si) linkages (Q4(0Al)) remained the dominant structural feature.
- Increased B2O3 content enhanced the overall polymerization and connectivity of the glass network.
- A decrease in thermal expansion coefficient and an increase in Vickers hardness and density were observed.
- Overall enhancement in glass durability against hydrofluoric acid and alkaline solutions.
Conclusions:
- The incorporation of B2O3 into lithium aluminosilicate glass effectively modifies the network structure.
- Enhanced polymerization and connectivity due to B2O3 lead to improved thermomechanical properties and chemical resistance.
- Optimized boron-containing lithium aluminosilicate glasses show potential for applications requiring high durability and stability.
Keywords:
boron oxidechemical stabilitylithium aluminosilicate glassmechanical propertiesnetwork structureMore Related Videos
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