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本文用X射线多晶衍射分析、热学分析和红外吸收光谱分析等方法,对LiBO_2玻璃晶化机制和固态相变进行了研究。LiBO_2玻璃在晶化过程中首先析出一亚稳相-δ-LiBO_2,δ-相的硼氧基团结构与玻璃态相近。继续升温δ-相转变为常压下难以制备的γ-相,而后γ-相再转变成α-相。玻璃晶化过程的比热研究表明,玻璃晶化之前先经过结构弛豫。对于同一种升温速率,颗粒度愈大,晶化温度愈高。
In this paper, X-ray diffraction analysis, thermal analysis and infrared absorption spectroscopy were used to study the crystallization mechanism and solid state transformation of LiBO_2 glass. LiBO_2 glass first precipitates a metastable phase-δ-LiBO_2 in the crystallization process, and the δ-phase boron-oxygen group structure is similar to the glassy state. Continue to heat up the δ-phase to a γ-phase that is difficult to prepare at atmospheric pressure, and then turn the γ-phase into an α-phase again. Specific heat studies of the glass crystallization process show that the glass undergoes structural relaxation before it is crystallized. For the same heating rate, the greater the particle size, the higher the crystallization temperature.