Commercially significant Li₂O-Al₂O₃-SiO₂ (LAS) glass composition with P₂O₅ content varying between 0 – 6.8 mol% were prepared through the conventional melt-quenching route. From high-temperature dilation results, it was found that different amount of P₂O₅ in the LAS glass greatly influences the phase transformation (glass transition, softening and melting) characteristics. Two LAS glass systems, namely 3.1 mol% of P₂O₅ (P3.1) and without P₂O₅ (P0) were considered further towards making low expansion glass-ceramic using bulk and sintering route due to their contrary thermal behaviour. The optimum nucleation temperature for P0 and P3.1 glass system was determined to be 640 and 700 °C, respectively using the Marotta method. Effect of heat-treatment temperature on the thermal expansion behaviours of the LAS glass-ceramic is explained in detail. Negative thermal expansion (NTE) and low expansion glass-ceramics were produced from bulk and sintering route. Transparent β–quartz s.s. based ultra-low thermal expansion (0.04 ×10^–6 °C^–1 between –60 °C and 400 °C) glass-ceramic was produced.

通过常规的熔融淬火途径制备了商业上有意义的Li ₂ O-Al ₂ O ₃ -SiO ₂（LAS）玻璃组合物，其中P ₂ O ₅含量在0 – 6.8 mol％之间变化。从高温膨胀结果，发现在LAS玻璃中不同量的P ₂ O ₅极大地影响相变（玻璃化转变，软化和熔融）特性。两个LAS玻璃系统，即3.1摩尔％的P ₂ O ₅（P3.1）和不含P ₂ O ₅由于其相反的热行为，（P0）被认为进一步朝着使用本体和烧结路线制造低膨胀率玻璃陶瓷的方向发展。使用Marotta方法将P0和P3.1玻璃系统的最佳成核温度分别确定为640和700°C。详细说明了热处理温度对LAS微晶玻璃热膨胀行为的影响。负热膨胀（NTE）和低膨胀玻璃陶瓷是通过本体和烧结途径生产的。制作了基于透明β–石英ss的超低热膨胀（在–60°C和400°C之间为0.04×10 ^–6 °C ^–1）玻璃陶瓷。