偏硼酸锂固体及其熔体结构的高温Raman光谱研究

High Temperature Raman Spectra and Micro-Structure Study of Lithium Metaborate and Its Melt

本文对偏硼酸锂 (LiBO2 )从室温到 16 73K进行了Raman光谱测试 ,得到了其在不同温度下的Ra man谱图。通过分析 ,阐述了常温下的链状BO3 三角形结构在熔化后逐渐转变为六角环 (B3 O6) 3 -,即相变过程 ;以及在 12 73K后 ,由长链和六角环结构转化为CRN(ContinuousRulelessNetwork ,BO3 单元组成的连续无规网络 )的新的相平衡移动过程。通过各谱峰在相平衡移动过程中相对量的增减 ,反映出在熔态中 ,样品随温度而引起的微观结构变化 ,显示了体系由长程有序向长程无序演化的过程。

Lithium metaborate (LiBO 2) is studied by high temperature Raman spectroscopy from room temperature up to 1 673 K,and spect ra drawing in different temperature are got.By analyzing,it focus on the phase t ransition,it is that the endless chains of BO 3 triangles transform into rings of (B 3O 6)- 3- at about 1 123 K,and then the different kind of phase ba lance′s motion occurs after 1 273 K which implies that both endless chain and r ing have changed to CRN.In the drawing,the variation of peak′s area rate im plies the micro-structure information,and shows the process from order to disor der.