Solidification/stabilization of toxic metals in calcium
· phases or OPC modified by calcium aluminate calcium sulphate and/or admixtures 1-7 occasionally forming new phases with the metallic cations. In addition G. Qian and co-workers have extensively studied the S/S processes of toxic metals in fly ash-calcium sulfoaluminate cement Friedel s salt or fly ashes 8-10 .
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Infrared absorption spectra of some experimental glasses
· ing some rare earth and other coloring oxides. All glasses were made with the same basic compo ition namely Si02 7l.4 percent Na20 18.4 percent and CaO 10.2 percent as computed from the batch materials. Calcium and anhydrous sodium carbonate of reagent quality and powdered crystal line quartz were employed for the base glass. The
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Study on the Influence of Mineralizer on the Preparation
The prepared calcium aluminates can be directly used for the production of polyaluminiumchloride (PAC) polymeric aluminum sulfate sodium aluminate and some other water treatment agents. The calcium aluminates preparation technology was optimized by investigating the mass ratio of raw materials (bauxiteand calcium carbonate) and mineralizer
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Infrared Spectroscopy in the Analysis of Building and
· calcium aluminate cements. Also the hydration of Portland cement and its constituents was developed by Bensted (1974). After that initial period several reports have been done in the study on cementitious materials by infrared. More recent studies in relation with the calcium aluminates cements were reported by Vázquez (1993).
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Characterization of Hydrated Aluminas by Infrared
· Infrared spectra of interaction products in the Na2O-Al2O3-SiO2-Fe2O3-TiO2-H2O system and bayer red slimes. Journal of Applied Spectroscopy 1970 13 (2) .
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Optomechanical Properties of Infrared Materials
· infrared spectrum. But because of the wide range of properties available in this limited list we do have enough variety to produce working systems. What is of importance is the availability of some of these materials and their associated costs. Some materials are very expensive when sold by weight for example germanium and zinc selenide. Others
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IR Window Transmittance Temperature Dependence
· camera (realbody) its transmittance will vary with its temperature and the target temperature. One popular class of IR window is based on fluoride salt crystals. The two IR windows made from these are barium fluoride (BaF 2) and calcium fluoride (CaF 2). BaF 2 is softer than CaF 2. Both have some
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Evaluation of Calcium Aluminate/Calcium Phosphate Based
The curing of calcium aluminate cement occurs with high water consumption during setting and hardening of prepared pastes. The relatively high strength values of calcium aluminate pastes compared to those of calcium phosphate and also wide range variations in the consistency and formulations make it suitable for a wide range of applications 3 4.
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Infrared absorption spectra of some experimental glasses
· Infrared Absorption Spectra of Some Experimental Glasses Containing Rare Earth and Other Oxides By Ralph Stair and Conrad A. F aick This paper gives specLral Lransmi ion data on soda lime glass containing rare earth (Y PI Nd Sm Cd Er) or oLher coloring oxi les (V Cr Mn Co Ni U) in the spectral Calcium and anhydrous sodium
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Infrared Spectroscopy of Calcium-Aluminium-rich Inclusions
We have performed infrared spectroscopy of meteoritic calcium-aluminum-rich inclusions (CAIs) from the CV chondrites Leoville and Allende. While some previous studies have focused on the wavelength range λ lt25 μm we aimed at a detection and identification of CAI bands at wavelengths from 6 to 75 μm. The resulting spectra have been compared with laboratory mineral spectra of typical CAI
Get PriceCharacterization of Hydrated Aluminas by Infrared
· This article is cited by 76 publications. Raffaella Demichelis Yves Noël Piero Ugliengo Claudio M. Zicovich-Wilson and Roberto Dovesi. Physico-Chemical Features of Aluminum Hydroxides As Modeled with the Hybrid B3LYP Functional and Localized Basis Functions.
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Structural Investigation of CaO–Al2O3 and
The structural aspects of aluminate systems have been reported by some scientists. Tarte proposed the characteris-tic frequency ranges for AlO 4 -tetrahedra as 900–650cm 21 and for AlO 6 -octahedra as 680–400cm 21 from the in-frared spectra of inorganic calcium aluminates.5) McMillan et al. interpreted the Raman spectrum of the 50(mol
Get PriceCalcite R050128RRUFF Database Raman X-ray Infrared
Carlson E T Berman H A (1960) Some observations on the calcium aluminate carbonate hydrates Journal of Research of the National Bureau of StandardsA. Physics and Chemistry 64A Porto S P S Giordmaine J A Damen T C (1966) Depolarization of Raman scattering in calcite Physical Review 147
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Synthesis and characterization of some calcium aluminate
· This work aimed to synthesize and characterize some calcium aluminate phases via sol–gel method. These phases were produced by mixing calcium and aluminum nitrates salts Ca(NO 3 ) 2 ·4(H 2 O) Al(NO 3 ) 3 ·9(H 2 O) which have been used as starting raw materials to prepare nano-oxides composite of CaO as well as Al 2 O 3 in different molar ratio for synthesizing CA C 2 A and C 3 A
Get PriceKnow Your Infrared Window TransmittanceIRISS
· accuracy. The research compared a Calcium Fluoride infrared window to a polymer-based window. Both windows were shown to have a 50 transmission rate when new. After just two years in a non-aggressive environment the transmission rate of the calcium fluoride window had dropped significantly. The "Simplified Transmittance Test" Equipment
Get PriceC-S-H gels in blended cements Study by infrared
· kind as calcium aluminate cement (CAC). This fact leads to a decrease of Ca/Si ratio and to an increase of Al/Ca ratio. A lot of works study the structure of C-S-H gel by means RMN technique with isotopes of 27 Al and 29 Si. In the literature there are few works that study the gel by infrared spectroscopy. Yu et
Get PriceOSA Refractive Indices of Infrared Optical Materials and
Calcium aluminate 3.07 594 8.1 770S 1.6731 1.6485 1.6413 1.6357 1.6297 1.6225 1.6140 1.6039 1.5919 3 IR-20 5.18 542 9 760 1.8852 1.8443 1.8347 1.8284 1.8220 1.8147 1.8063 1.7964 1.7848 1.7714 4 Strontium titanate 5.122 595 9.4 2080 2.4776 2.3161 2.2862 2.2679 2.2504 2.2312 2.2091 2.1838 2.1550 2.1223 5 Magnesium oxide 3.576 692 13.8 2800 1.7454
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Calcium Fluoride and Barium Fluoride Crystals in Optics
visible range up to the mid-infrared wavelength range. Calcium fluoride in deep UV applications Calcium fluoride crystals synthetically grown from highly purified CaF 2 pow-der are a high performance optical ma-terial. The extremely high purity of the material enables an internal transmis-sion of > 99.7 at the critical wavelength of 193 nm.
Get PriceInfrared Spectroscopy in the Analysis of Building and
· calcium aluminate cements. Also the hydration of Portland cement and its constituents was developed by Bensted (1974). After that initial period several reports have been done in the study on cementitious materials by infrared. More recent studies in relation with the calcium aluminates cements were reported by Vázquez (1993).
Get Price
Calcite R050128RRUFF Database Raman X-ray Infrared
Carlson E T Berman H A (1960) Some observations on the calcium aluminate carbonate hydrates Journal of Research of the National Bureau of StandardsA. Physics and Chemistry 64A Porto S P S Giordmaine J A Damen T C (1966) Depolarization of Raman scattering in calcite Physical Review 147
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Structural Investigation of CaO–Al2O3 and
The structural aspects of aluminate systems have been reported by some scientists. Tarte proposed the characteris-tic frequency ranges for AlO 4 -tetrahedra as 900–650cm 21 and for AlO 6 -octahedra as 680–400cm 21 from the in-frared spectra of inorganic calcium aluminates.5) McMillan et al. interpreted the Raman spectrum of the 50(mol
Get PriceKnow Your Infrared Window TransmittanceIRISS
· accuracy. The research compared a Calcium Fluoride infrared window to a polymer-based window. Both windows were shown to have a 50 transmission rate when new. After just two years in a non-aggressive environment the transmission rate of the calcium fluoride window had dropped significantly. The "Simplified Transmittance Test" Equipment
Get PriceInfrared Optical SystemsUniversity of Arizona
· October 4 2006 Infrared Optics Seminar 8 IR Signal • The total signal received by the detectors is the product of the target spectral emission the atmospheric transmittance the optical transmittance and the detector spectral response • Of course there s also the radiometric factors such as target size solid angles
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OSA Infrared Transmittance of Optical Materials at Low
· Transmittance measurements of a variety of infrared optical materials were made at approximate temperatures of 50°K 85°K and 300°K in the 1.0-μ to 15.0-μ wavelength region. The effects of these low temperatures on transmittance are presented in the form of curves with transmittance as a function of wavelength. A change in external transmittance was measured for some materials.
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Infrared Spectroscopy in the Analysis of Building and
· materials by infrared. More recent studies in relation with the calcium aluminates cements were reported by Vázquez (1993). Later on different papers have present some characterization of materials and evolution over several exposition conditions using the infrared spectroscopy as a complementary technique join to mainly XRD and SEM analytical
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The Correct Material for Infrared (IR) Applications
The Importance of Using the Correct Material. Since infrared light is comprised of longer wavelengths than visible light the two regions behave differently when propagating through the same optical medium. Some materials can be used for either IR or visible applications most notably fused silica BK7 and sapphire however the performance of
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PREPARATION AND CHARACTERIZATION OF DICALCIUM
· DICALCIUM ALUMINATE HYDRATE (C2AH8) Tomisla CZYKa Faculty of Chemical Engineer of Zagreb Croatia Introduction dTG 2 th of calcium 2 8 Materials m aluminate (CA) and mayenite → C2AH8 C12 H8 or the 12 products were investigated by X-ray Results v MATUSINOVIĆa Juraj ŠIPUŠIĆa Boris ZIMMERMANNb Neven UKRAIN a ing and Technology University
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The Correct Material for Infrared (IR) Applications
The Importance of Using the Correct Material. Since infrared light is comprised of longer wavelengths than visible light the two regions behave differently when propagating through the same optical medium. Some materials can be used for either IR or visible applications most notably fused silica BK7 and sapphire however the performance of
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Infrared absorption spectra of some experimental glasses
· ing some rare earth and other coloring oxides. All glasses were made with the same basic compo ition namely Si02 7l.4 percent Na20 18.4 percent and CaO 10.2 percent as computed from the batch materials. Calcium and anhydrous sodium carbonate of reagent quality and powdered crystal line quartz were employed for the base glass. The
Get PriceC-S-H gels in blended cements Study by infrared
· kind as calcium aluminate cement (CAC). This fact leads to a decrease of Ca/Si ratio and to an increase of Al/Ca ratio. A lot of works study the structure of C-S-H gel by means RMN technique with isotopes of 27 Al and 29 Si. In the literature there are few works that study the gel by infrared spectroscopy. Yu et
Get Price
