Raman Spectra of a and Cristobalite
Raman Spectra of a and Cristobalite
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a 和方英石的拉曼光谱
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
J. Bates
中科院分区：
文献类型：
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作者：
J. Bates
在77°K ~ 538°C的基模频率范围内测量了多晶石英晶体的拉曼光谱。在α-β转变温度以上和以下所记录的光谱是显著不同的。在25°C时，α方石英在416和230 cm−1处测得的强谱带在β相的光谱中没有观察到。β方石英的拉曼光谱只有三个谱带，与结晶石英相反，在相变点附近的温度测量中没有观察到强烈的温度依赖性谱带。记录了α方石英的红外反射光谱，测定了其纵光学模频率。β方石英的拉曼光谱表明，这种材料的结构不能作为非晶态SiO2的晶格模型。
Raman spectra of polycrystalline crystobalite were measured over the frequency interval of the fundamental optical modes from 77°K to 538°C. Spectra recorded above and below the α–β transition temperature were strikingly different. The strong bands measured at 416 and 230 cm−1 with α cristobalite at 25°C were not observed from spectra of the β phase. The Raman spectrum of β cristobalite exhibited only three bands and, in contrast to crystalline quartz, a strongly temperature dependent band was not observed from measurements at temperatures near the transition point. Infrared reflection spectra of α cristobalite also were recorded, and the longitudinal optical mode frequencies were determined. Raman spectra of β cristobalite showed that the structure of this material should not be employed as a lattice model for noncrystalline SiO2.