摘要
A series of glass are synthesized via a melt quenching technique based on the Li_(2)O-Ni O-P_(2)O_(5) 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 Li_(3)P and Ni_(2)P_(4)O_(12)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 Ni_(2+) spectra are present in both octahedral and tetrahedral sites.Physical properties such as glass density((2.38±0.1)-(2.46±0.1)g/cm^(3)),and molar volume((42.28±0.1)-(39.15±0.1)cm^(3)/mol)are examined.The NiO/Li_(2)O 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/(cm^(2)·min).Thermal expansion coefficients CTE of the glasses are diverse from 157×10^(-7) to 96×10^(-7)℃^(-1) over the temperature range of 25-250℃.The prepared glasses are expected to be useful as a low-temperature sealing material.
基于Li_(2)O-NiO-P_(2)O_(5)体系,改变氧化镍的浓度(摩尔分数从5%到15%),采用熔体淬火技术合成系列玻璃样品。XRD图谱表明含5%和10%氧化镍制备的玻璃样品具有非晶性质,在Li_(3)P和Ni_(2)P_(4)O_(12)相沉淀中镍含量高,摩尔分数高达15%。随着镍取代锂,可以观察到玻璃化转变温度(T_g)和玻璃化软化温度(T_s)呈系统性升高。这与玻璃网格中结构的增加、结构的连惯性有关。结构研究表明,Ni^(2+)存在于八面体和四面体的位置。系列玻璃样品的密度为(2.38±0.1)~(2.46±0.1) g/cm^(3),摩尔体积为(42.28±0.1)~(39.15±0.1) cm^(3)/mol。用NiO替代Li_(2)O合成的非晶材料的溶解速率从1.53×10~(-5)降低到3.20×10^(-6 )g/(cm^(2)·min)。在25~250℃的温度范围内,玻璃的热膨胀系数从157×10^(-7)到96×10^(-7)℃^(-1)变化。所制备的玻璃有望用作低温密封材料。
