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Takashi Uchino Tetsuo Sakka Koukichi Hotta Matae Iwasaki 《Journal of the American Ceramic Society》1989,72(11):2173-2175
Attenuated total reflectance Fouriertransform infrared (ATR-FTIR) spectra were measured in the region from 4300 to 400 cm−1 for a hydrated Na2 O–SiO2 glass containing 35 wt% water. The Si–OH bending vibration mode was observed. It was found that the incorporated water, molecular water as well as hydroxyls, affected the Si–O vibrations. The effect of incorporated water upon the glass structure is discussed. 相似文献
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Anhydrous glasses in the series x Li2 O + (1 - x )P2 O5 have been prepared and characterized in the range 0 ≤ x ≤ 0.5. FT-IR spectroscopy and glass transition temperature measurements have been used to explore the structure and a key physical property of the low-alkali phosphate glasses. The structure of v -P2 O5 is proposed to consist of a 3-D network of trigonally connected tetrahedra decorated with a P=O unit. Contrary to what has long been proposed for these glasses, the addition of alkali degrades the 3-D network through the generation of nonbridging oxygens rather than strengthen the network through the proposed alkali ion bridging. The T g of v -P2 O5 is ∼653 K and decreases some 130 K with the addition of 10 mol% Li2 O. T g then reaches a minimum value at 20 mol% Li2 O and increases with further Li2 O additions. The increase in T g , even though the fraction of nonbridging oxygens is still increasing, is interpreted in terms of an increasing entanglement of long-chain PO2 groups in the glass. Such a structural transition from a 3-D network of interconnected PO4 groups for P2 O5 to a 1-D chain structure for LiPO3 is one of the first examples of the importance of intermediate-range order in governing the properties of glass. 相似文献
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The relations between the structure, crystal chemistry, chemical bonds involved, and the infrared spectra of layer-structure silicates established on the basis of recent experiments are discussed and summarized. 相似文献
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Vacuum ultraviolet absorption spectra of silver dissolved in 60 mol% B2 O3 -40 mol% SiO2 glass in oxygen, nitrogen, and oxygen–nitrogen atmospheres at 1000°, 1100°, and 1200°C were measured. Strong absorption which may be attributed to Ag+ -complex was observed around 5.5 and 6.5 eV. It is suggested that an Ag+ -complex/Ag0 redox pair exists in the glass and that this pair shows O-type redox behavior. 相似文献
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Infrared and Raman Spectra of Zirconia Polymorphs 总被引:2,自引:0,他引:2
The infrared and Raman frequencies of monoclinic zirconia and of stabilized and metastable tetragonal and cubic zirconias were established. Infrared spectra were examined by the powder transmission (CsI pellet) and surface reflection techniques. The effects of heating, grinding, and adding stabilizing oxides on the ir spectra were determined. The spectra develop additional bands as the crystal symmetry is lowered, and certain of these bands are highly sensitive to strain-induced distortions of the crystal lattice. Practical applications of ir and Raman spectroscopy to zirconia technology are discussed. 相似文献
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Vijay Mohan Bhatnagar 《Advanced Synthesis \u0026amp; Catalysis》1969,311(2):302-327
Nickel cyanide-ammonia forms clathrate compounds with a variety of organic molecules such as aniline, benzene, pyridine, pyrrole, and thiophene. The present results suggest that there is a definite indication of captured molecules and the absorption characteristics of molecules in their environment in nickel cyanide-ammonia cage are similar to those of the molecules in liquid state. In accepting the guest molecules, the nickel cyanide-ammonia structure is not changed, since apart from the appearance of bands due to the trapped molecules, the bands due to pure nickel cyanide-ammonia remain virtually unchanged. The infrared spectra of nickel cyanide-ammonia clathrates in the 100–4000 cm−1 region are described in this investigation. 相似文献
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Interpretation of the Infrared Spectra of Fused Silica 总被引:1,自引:0,他引:1
A vibrational analysis was performed for fused silica assuming short-range order in the glassy network. This order is described by an average structural unit based on the model α-quartz. The analysis uses a group theoretical method and the Wilson FG-matrix techniques to predict 16 normal mode vibrational frequencies based on a diagonal force field. The most probable values of the force constants, which were obtained from the best fit between the calculated vibrational frequencies and the measured spectral values, are:
Although the selection rules are not adhered to, 15 predicted frequencies are within the ranges of the spectra of fused silica reported in the literature. 相似文献
Although the selection rules are not adhered to, 15 predicted frequencies are within the ranges of the spectra of fused silica reported in the literature. 相似文献
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介绍了红外测温仪系统的原理、构成及其在浮法玻璃生产线上的实际应用情况,并指出了采用红外测温仪应注意的几个问题.实践证明,红外测温仪在优质浮法玻璃生产过程中,能直接精确检测玻璃液或玻璃板的温度,为稳定工艺温度制度起到重要作用. 相似文献
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The effects of deuterium treatment on the in absorption bands infused silica were measured. The deuterium treatment progressively replaces the OH group by the OD group as determined by reduction in the intensity of OH bands. New OD bands of lower intensity were developed at longer wavelengths. The extinction coefficient of the OD group was determined to be 0.57 times lower than that of the OH group . 相似文献
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SCOTT ANDERSON 《Journal of the American Ceramic Society》1950,33(2):45-51
Infrared reflection spectra of a number of glasses are presented. It is apparent that in some cases such a method may be a useful tool in determining the atomic arrangement in glasses, especially when combined with quantitative measurements of the refractive index and extinction coefficient. The dispersion curves of barium-containing silicate glasses show that the network of these glasses contains metals in at least two different types of coordination. One is obviously the silica tetrahedron and the other is probably a octahedrally coordinated barium. The latter is concluded by comparison with the reflection spectrum of benitoite. Reflection spectra of boric oxide glasses are presented. These indicate that pure boric oxide glass is not 100% triangularly coordinated and that the pure glass contains much more tetrahedral coordination than was previously concluded from X-ray-scattering data. 相似文献
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Interpretation of the Kaolinite-Mullite Reaction Sequence from Infrared Absorption Spectra 总被引:2,自引:0,他引:2
The phases in the kaolinite-mullite reaction sequence were reexamined by ir absorption spectrophotometry. Particular attention was paid to the controversial intermediate Al-containing phases. Amorphous materials were leached from fired kaolinite samples with NaOH to help identify crystalline phases. Metakaolinite partially decomposes, releasing amorphous γ-Al2 O3 and SiO2 , before the "950°C" exothermic reaction in which metakaolinite is completely decomposed. The resulting spinel-type phase, which is associated with amorphous SiO2 and some poorly crystalline "primary" mullite, is γ-Al2 03 (crystalline) rather than an Al-Si spinel. There is some evidence, however, that a fraction of the γ-Al2 O3 , may be an Al-Si spinel. At ≥1100°C secondary mullite therefore forms primarily from the γ-Al2 O3 /amorphous SiO2 reaction and the recrystallization of primary mullite, whereas excess amorphous SiO2 eventually crystallizes as cristobalite. 相似文献
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Infrared spectra of two soda-lime silicate glasses were measured after different times of hydration and dehydration. The height of OH and molecular water bands increased proportionally to the square root of time during hydration. The amount of dehydration with time was fit with a diffusion model; the diffusing species was probably molecular water. The rate of dehydration of the two laboratory glasses was many orders of magnitude faster than the rate for a commercial soda-lime glass, consistent with the presence of a transformed layer on the surface of the hydrated laboratory glasses. 相似文献
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温度测量在玻璃瓶生产过程中,对提高产品质量、保障设备的正常运行具有十分重要的作用。介绍了红外热像仪在玻璃瓶生产中模具、料滴等的适时、动态、无接触的温度测量和对运行中的玻璃熔窑、退火窑进行远距离温度场测量中的使用体会 相似文献
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碲卤系红外玻璃光纤的制备及性质 总被引:1,自引:0,他引:1
研究了碲卤系中远红外玻璃光纤的制备及性质,提出了制备碲卤系玻璃预制棒的一个改进的方法,用该方法制备出了高透光率的中远红外玻璃,拉制出了在10.6μm附近光损耗约为10dB/mr Te3Se4I3玻璃光纤,并测试了这种玻璃纤维的最小抗弯曲率半径。 相似文献