Characterization of Inorganic Amorphous Materials by Raman Spectroscopy

在这个项目中，我们研究了拉曼光谱作为无机材料表征工具的实用性。首先，给出了加入几种化合物作为掺杂剂的用于制造光纤的工业玻璃材料的振动谱。证明了石英玻璃拉曼带的波数或带形的变化是可以实现的，也可以根据掺杂剂的种类而不实现。例如，<B_2O_3>作为掺杂剂时，波数和能带形状有明显的变化，而氟掺杂剂则没有这种变化。这一现象表明，在某些情况下，由于掺杂剂的混合，玻璃材料的结构发生了变化。通过将激发激光束插入光纤的一端，对光纤另一端发出的光进行光谱测量，成功地测量了长度为10米至1公里的光纤。在某些情况下，纤维的光谱与玻璃材料的光谱不同。我们认为制造纤维的过程是造成这种光谱差异的原因。接下来，我们用拉曼光谱法对氮化硼进行了检测。样品均为黑色粉末，将样品用KBr粉末稀释后制作片剂，高速旋转片剂，即可完成样品的测量。结果表明，六方型、立方型和纤锌矿型氮化硼均具有独特的拉曼光谱特征。特别是纤锌矿型样品，在拉曼光谱中没有观察到拉曼信号，而在红外吸收光谱中出现了两条清晰的条带。即完全实现了不相容原理。这种现象可能为样品的结构提供重要信息。最后，我们设计了一种显微拉曼测量仪器，配备了目前使用的拉曼分光光度计。通过使用该仪器，证实了在测量光纤内部（核心部分）的情况下，灵敏度显着提高。同时，通过使用显微技术，被测量的纤维部分可以变得清晰，这一点被认为是非常重要的。少

In this project, we examined the usefulness of Raman spectroscopy as a tool of characterization of inorganic materials. In the first, it was shown that the vibrational spectra of industrial glass materials for manufacturing optical fibers, to which several compounds were added as dopants. It was proved that the changes in wavenumbers or band shapes for the Raman bands of quartz glass were realized, or not realized according to the kind of dopants. For example, the wavenumbers and band shapes showed the marked change in the case of <B_2O_3> as a dopant, while no such changes were not observed in the case of fluorine dopant. This phenomenon suggested that there are some cases where the structure of glass materials changes as a result of mixing dopants. The measurement of optical fibers whose lengths are from 10 m to 1 km was successfully made by entering the excitation laser beam into one end of fibers, and measuring spectrally the light coming from the other end of fibers. There are som … More e cases where the spectra of fibers are different from those of glass materials. We consider that the process of manufacturing fibers is responsible for such spectral difference. In the next, we examined boron nitride with Raman spectroscopic method. The samples are all black powders, and the measurement for these samples succeeded by making tablets after the samples are diluted with KBr powders, and rotating the tablet with high speed. It was proved that each boron nitride of hexagonal, cubic and wurzite type exhibited characteristic Raman spectral patterns. Especially, in the case of the sample of wurzite type, no Raman signal was observed in the Raman spectrum, while the two clear bands appeared in the infrared absorption spectrum. That is, the exclusion principle was realized exactly. This phenomenon may give important informations for the structure of this sample. Lastly, we designed to equip a microscopic Raman measurement instrument with the Raman spectrophotometer used till now. By use of this instrument, it was confirmed that the sensitivity in the case of the measurement of the inside of optical fibers (the core parts) increased remarkably. At the same time, it is considered very important that by use of the microscopic technique, the part of fibers, which is being measured, can become clear. Less