Preparation and characterization of new sealing glasses based on Li₂O-NiO-P₂O₅ system

Abstract

A series of glass are synthesized via a melt quenching technique based on the Li₂O-NiO-P₂O₅ system. The concentration of nickel oxide varies from 5% to 15% in molar fraction. XRD pattern verifies the amorphous nature of prepared glass samples with 5%, and 10% nickel oxide in molar fraction. While Li₃P and Ni₂P₄O₁₂ phases are precipitated with a high nickel content up to 15% in molar fraction. As nickel is substituted for lithium, a systematic increase in glass transition temperature (T_g) and glass softening temperatures (T_s) is observed. This is greatly related to the increased structure, coherence in the glass network. Structural investigation showed that Ni²⁺ spectra are present in both octahedral and tetrahedral sites. Physical properties such as glass density ((2.38±0.1)−(2.46±0.1) g/cm³), and molar volume ((42.28±0.1)−(39.15±0.1) cm³/mol) are examined. The NiO/Li₂O replacements led to a decrease in the dissolution rate of the resultant amorphous materials from 1.53×10⁻⁵ to 3.20×10⁻⁶ g/(cm²·min). Thermal expansion coefficients CTE of the glasses are diverse from 157×10⁻⁷to 96×10⁻⁷ °C⁻¹ over the temperature range of 25 −250 °C. The prepared glasses are expected to be useful as a low-temperature sealing material.

Keywords

glass / sealing / nickel oxide / thermal expansion / dissolution rate

References

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