无水五硼酸钾晶体高温性质振动光谱的研究

利用自行设计的反应器研究了高温条件下水蒸汽对无水五硼酸钾晶体结构的影响,借助于X射线衍射、红外光谱、Raman光谱等手段分析了无水五硼酸钾晶体高温性质的振动光谱.在水蒸汽的作用下,五硼酸钾的B2O3/K2O(摩尔比)变小,X射线衍射分析表明750℃时晶体中有K5B19O31存在,而红外光谱与Raman光谱分析表明由于水蒸汽的作用使得晶体中的三角形B(3)-O结构单元向四面体B(4)-O结构单元转变,四面体的B(4)-O含量增加并且硼氧网络结构被进一步打断.

Study on Vibration Spectrum and Properties of Anhydrous Potassium Pentaborate Crystal at High Temperature

The effect of water vapor on the structure of anhydrous potassium pentaborate was studied at high temperature by self-designed reactor in the present paper. The vibration spectra of anhydrous potassium pentaborate crystal at high temperature were analyzed by X-ray diffraction spectrum(XRD), infrared spectrum (IR) and Raman spectrum. The ratio of B2O3 to K2O in potassium pentaborate was diminished by reacting with water vapor. XRD analysis shows that K5B19O31 exists inpotassium pentaborate crystal at 750 degrees C, while IR and Raman analysis show that some triangular structure units(B(3)--O) are changed to tetrahedral structure units(B(4)-O) in the crystal. The content of tetrahedral structure unit(Br(4) -O) increases and the network configuration between boron and oxygen is farther broken.