摘要
针对硼氧酸盐晶体结构和溶液体系中硼氧配阴离子的复杂多变性,采用X射线粉末衍射、综合热分析和傅里叶变换红外光谱对五硼酸铵晶体进行了综合表征,分析了其晶相结构、组成和热稳定性。记录了不同p H值条件下五硼酸铵饱和溶液的拉曼光谱,分析了五硼酸铵水溶液的离子结构变化特征。研究结果表明:在五硼酸铵晶体和溶液中,硼均以多聚硼氧配阴离子的形式存在,且在饱和溶液中以多种离子形式动态平衡共存,可相互转化。溶液p H值的降低有利于硼氧配阴离子的聚合。
The composition and structure of polyborate anions in borate crystals and related solution systems were quite complex. The comprehensive characterization for ammonium pentaborate crystal with typical hydrated borate was carried out by means of X-ray diffraction,thermal analysis and Fourier transform infrared spectroscopy. The crystal structure,composition and thermal stability were analyzed. In order to probe the changing feature of the polyborate anions in saturated solution,the Raman spectroscopy of ammonium pentaborate saturated solution at different p H values was also recorded. The results show that in both ammonium pentaborate crystal and saturated solution,the boron exists as polyborate anions. There exist lots of various ions which can coexist and transform to one another in the saturated solution of ammonium pentaborate.Reduction of the p H value of the saturated solution is in favor of the polymerization of polyborate anions.
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2016年第3期100-104,10,共5页
Journal of Henan University of Science And Technology:Natural Science
基金
国家自然科学基金项目(21576073)
洛阳市矿产资源化工重点实验室建设基金项目(1003016A)
关键词
五硼酸铵
晶体
饱和溶液
谱学研究
结构分析
ammonium pentaborate
crystal
saturated solution
spectroscopy study
structure analysis
