四硼酸钾晶体的拉曼振动谱

Raman Spectrum of Potassium Tetraborate Crystal

本文报道了四硼酸钾(K_2B_4O_7·4H_2O 简称 KB_4)晶体的拉曼光散射。用拉曼光谱分析了 KB_4晶体的结构特点,指出光谱中的最强峰仍属于畸变 BO_4四面体的振动。但由于其畸变比某些晶体如KTP 中的 TiO_6八面体小,分子极化率低,故散射强度远比 KTP 晶体低。由于分子中存在较多水分子,其引起的氢键使振动频率降低,谱线红移。

The Raman spectrum of potassium tetraborate (K_2B_4O_7,KB_4) was reported in thispaper.The structure features of KB_4 crystal were analysed by use of Raman spectrum.Itis shown that the strongest intensity peakes in spectrum are assigned to distored BO_4 tetra-hedron.Because of the distortion in this crystal is smaller than that of TiO_6 octahedron incertain crystals such as KTP.The relatively smaller molecular polarization of KB(?)esults inmuch lower scattering than KTP crystal.Due to the water molecules existed in the crystalfomed the hydrogen bonds lowered the vibration frequency resulted in red shift of the spec-tral lines.