Crystallization and sintering studies on an anomalous Li₂O‐Al₂O₃‐SiO₂ glass for making tunable thermal expansion ceramic

Abstract

The material with dimensional and thermal stability manifested their importance in widespread applications from kitchen to cosmos. 1,2 Lithium aluminosilicate (LAS) glassceramic is one of such material attracted research as well as industrial community due to their properties namely low coefficient of thermal expansion (CTE), thermal shock resistance, chemical durability, and mechanical strength. [2][3][4] Attracted by their thermal properties, LAS glass-ceramics are studied for dielectric properties. 5,6 The process of making low expansion glass-ceramic (LEGC) relies on precipitating high-quartz type LAS based negative thermal expansion (NTE) crystals uniformly throughout the glass matrix. 7 These stuffed derivatives of quartz structure proposed by Buerger 8 and Li et al. 9 are comparable with magnesium aluminosilicate based -cordierite system. 10 Mg 2+ ions occupy octahedral coordination sites, and Zn 2+ ion occupies tetrahedral sites in high-quartz type crystals. Zn 2+ substitution in the LAS crystals system can result in very high NTE behavior whereas Mg substitution results in low positive thermal expansion (PTE). Mg substitution up to 20% allows the precipitation of high-quartz type s.s. 11 The addition of MgO with CaO in LAS glass system was reported to reduce the crystallization temperature. 12 Alekseeva et al. 13 reported that the addition of PbO, MgO, BaO in LAS glass improves the precipitation of quartz solid solution and ZnO, Na 2 O, and K 2 O addition accelerates the crystallization process. BaO addition in LAS glass reported yielding better dielectric properties. 14 In LAS GC precipitating high-quartz

Research of crystallization kinetics, luminescence and abnormal thermal quenching behavior of Al2O3–B2O3–SrO glass ceramic

“…In DTA, the location of the crystallization peak is dependent on the heating rate, which can be applied for determining the crystallization activation energy of amorphous materials. 20 The Kissinger method 21 and Ozawa method 22 are the most common methods used to calculate the crystallization activation energy.…”

Interpreting the optical properties of oxide glasses with machine learning and Shapely additive explanations

“…Further studies on glass-forming ability and stability should also be considered before manufacturing these glasses. 23,[41][42][43][44][45][46][47] Although the model can capture the details of the composition-property models, the model is too complex to be interpretable. Specifically, the NN models for V d and n d have highly complex structures with multiple hidden layers, and many fully connected hidden layer units.…”