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Microwave Dehydration of Borax: Characterization, Dehydration Kinetics, and Modelling
Pleiades Publishing Ltd - Tập 48 - Trang 210-218 - 2022
Fatma Tugce Senberber Dumanli, Azmi Seyhun Kipcak, Emek Moroydor Derun
In the present study, borax (Na2B4O7·10H2O) was dehydrated using microwave radiation and the dehydration rate curves were calculated. The kinetic parameters and mathematical constants of several drying models were calculated from the dehydration curve data. The best model was selected using the statistical analyses of R2, χ2, and root mean square error. From the best model, the kinetic parameters ...... hiện toàn bộ
Identification of photoluminescence centers in oxygen- and erbium-doped a-Si(H) films
Pleiades Publishing Ltd - Tập 37 - Trang 406-410 - 2011
G. A. Bordovskii, A. Yu. Dashina, A. S. Naletko, A. V. Marchenko, P. P. Seregin, E. I. Terukov
It has been shown that [Er-O] clusters play the role of photoluminescence centers in films of amorphous hydrogenated silicon a-Si(H) doped with oxygen and erbium. The local symmetry of Er3+ ions in clusters is the same as that in Er2O3. A decrease in the cluster size and an increase in the particle density result in the enhancement of the photoluminescence intensity of a-Si(H): Er at a wavelength ...... hiện toàn bộ
Photon interaction parameters for some ZnO–Al2O3–Fe2O3–P2O5 glasses
Pleiades Publishing Ltd - Tập 43 - Trang 227-232 - 2017
Preet Kaur, Tejbir Singh, Devinder Singh
Some photon interaction parameters such as mass attenuation coefficient, effective atomic number, half value layer, mean free path and electron density for 15ZnO–(17.5–x)Al2O3–xFe2O3–67.5P2O5 glass system (x = 0, 7.5, 12.5, 17.5) and 15ZnO–(25–x)Al2O3–xFe2O3–60P2O5 glass system (x = 0, 25) have been investigated in the photon energy range of 1 keV to 100 GeV. It has been observed that all the phot...... hiện toàn bộ
Effect of fluorine additions on the stability of Mg3Si4O10(OH)2: Computer simulation
Pleiades Publishing Ltd - Tập 37 - Trang 441-444 - 2011
A. N. Chibisov
The computer simulation of the effect of dopant F atoms on the stability of Mg3Si4O10(OH)2 has been carried out using the density functional theory and pseudopotential method. It has been shown that the mechanism of dehydration is implemented by removing first hydrogen, and then (from the same OH positions) oxygen atoms. Incorporation of doped F atoms into the lattice leads to an increase in the O...... hiện toàn bộ
The scientific and technological aspects of foam glass production
Pleiades Publishing Ltd - Tập 41 - Trang 157-162 - 2015
P. A. Ketov, A. A. Ketov, Ya. I. Vaisman
Cellular silicate glass and foam glass-ceramic materials are of considerable interest from scientific and practical perspectives due to their unique performance properties. It is shown that the previous powder technology was based on the sulfate mechanism of gas formation which had inherent disadvantages. Reasons are given for an opportunity to use quite a different, i.e., hydrated, mechanism of g...... hiện toàn bộ
Features of the Hydrothermal Synthesis of Montmorillonite in an Acidic Medium
Pleiades Publishing Ltd - Tập 44 Số 6 - Trang 616-619 - 2018
Golubeva, O. Yu.
The process of the hydrothermal crystallization of montmorillonite Na2x(Al2(1 – x),Mg2x)-Si4O10(OH)2 · nH2O (0 < x ≤ 1) is studied in a weakly acidic medium with pH 4–4.5 at 220°С using HF as a mineralizer. The results of the study showed that montmorillonite samples in the acidic medium can be obtained both with the use of the HF mineralizer and without it. Under any conditions of ca...... hiện toàn bộ
Maxwell equation and classical theories of glass transition as a basis for direct calculation of viscosity at glass transition temperture
Pleiades Publishing Ltd - Tập 39 - Trang 609-623 - 2013
S. V. Nemilov
The main relaxation theories of glass transition (Leontovich-Mandelstam and Volkenstein-Ptitsyn) variously formulate the kinetic criteria of glass transition. Both of the approaches are shown to be equivalent in physical sense and provide a single expression that connects the rate of change of a melt temperature and the structure relaxtion time. The theory characterizes the width of a temperature ...... hiện toàn bộ
Infrared Spectroscopy Study of Silver-Containing Composite Materials Based on Nanoporous Silicate Glass Doped with Tb3+ or Sm3+ Ions
Pleiades Publishing Ltd - Tập 45 - Trang 325-331 - 2019
M. A. Girsova, G. F. Golovina, I. N. Anfimova, L. N. Kurilenko
Composite materials (CMs) doped with AgI or AgBr and Tb3+ or Sm3+ ions are synthesized based on matrices of high-silica nanoporous glass (NPGs). The structure of the CMs is studied by IR spectroscopy in the frequency range of 4000 to 400 cm–1. Bands corresponding to the Ag–O vibrations are found in the IR transmittance spectra of the CMs in the range of 604 to 592 cm–1. The presence of bands is es...... hiện toàn bộ
Phase transformations in glass of the MgO–Al2O3–SiO2–TiO2 system doped with yttrium oxide
Pleiades Publishing Ltd - Tập 41 - Trang 597-606 - 2015
I. P. Alekseeva, O. S. Dymshits, A. A. Zhilin, M. D. Mikhailov, A. A. Khubetsov
Phase transformations upon crystallization of glasses in a magnesium-aluminosilicate system nucleated with TiO2 as a nucleating agent, both doped and undoped with yttrium oxide, which were thermally treated in singleand two-stage modes in the temperature range 750–1200°C, have been investigated. Use of the two-stage mode with the first stage (nucleation) at 750°C yields changes in the phase compos...... hiện toàn bộ
Ion-Exchange Interaction of Glass-Forming Silicate Melts with Mixed Chloride Melts
Pleiades Publishing Ltd - Tập 44 - Trang 85-91 - 2018
S. I. Sviridov, N. G. Tyurnina, Z. G. Tyurnina, L. N. Kurilenko
The ion-exchange interaction of the sodium aluminosilicate and sodium galliumsilicate melts with a mixture of molten Li, Na, K, Rb, Cs, and Ba chlorides is studied. It is established that two alkaline silicate melts are characterized by negative deviations from the ideal behavior, and silicate melts containing alkaline and alkaline-earth cations are characterized by noticeable positive deviations ...... hiện toàn bộ
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