Na5[B2P3O13]晶体的紫外-远红外光谱分析

Analysis of ultraviolet-far-infrared spectra of Na5[B2P3O13]crystal

为了探索硼磷酸钠(Na5[B2P3O13],NBP)晶体可能具有的功能特性,发展适用不同光谱范围的硼磷酸盐材料,对其紫外-远红外光谱以及拉曼光谱进行了研究。实验测量了室温下NBP晶体在200~2 000 nm的紫外-可见-近红外透射和反射光谱、50~4 000 cm-1远红外透射光谱以及拉曼光谱。首先根据光学常数间的关系,计算得到吸收系数、消光系数和折射率,并对计算得到的折射率采用Sellmeier方程进行拟合。然后分析由紫外到远红外的宽频透射光谱,最后对晶体的拉曼振动峰进行了指认。研究结果表明:在200~2 000 nm波长范围内最大吸收系数为3.1 cm-1,消光系数数量级为10-6,折射率在1.56~1.80之间,得到Sellmeier方程。在105~120 THz和150~375 THz频率范围内晶体透射率大于80%,在1.5~71 THz的声子吸收带的透射率几乎为零。晶体可作为某些波段的光学窗口材料或者特定波段的滤波器。

In order to determine the latent function of an Na5[B2P3O13]crystal,its ultraviolet-far-infrared spectra and Raman spectra are studied.The ultraviolet-visible-infrared and far-infrared spectra and Raman spectra of an Na5[B2P3O13]crystal were measured at room temperature in the range of 200 to 2 000 nm and in the range of 50 to 4 000 cm-1.The results show that the maximum absorption coefficient is 3.1 cm-1,the extinction coefficient is in the order of 10-6and the refractive index is 1.56 to 1.80.Its Sellmeier equation isthen obtained.In the frequency ranges of 105 to 120 THz and 150 to 375 THz,the transmittance is more than80%,but in the frequency range of 1.5 to 71 THz,the transmittance is nearly zero.It is possible that the Na5[B2P3O13]crystal can be used as an optical window material or filter in some frequency ranges.