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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
Synthesis and Research of the Properties of Lanthanum and Neodymium Indates
Pleiades Publishing Ltd - Tập 46 - Trang 434-439 - 2020
L. V. Morozova, I. A. Drozdova
Single-phase nanocrystalline (18–20 nm) lanthanum indate powder (LaInO3) and neodymium indate powder (NdInO3) with the structure of orthorhombic perovskite are synthesized by the coprecipitation of hydroxides with the simultaneous ultrasonic treatment of the precipitation and subsequent firing of the powder-precursors at a temperature of 700°C. Ceramic samples with an open porosity of 4 to 5% are ...... 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
Molecular Dynamics Study of the Mechanism of Ion Diffusion in an Na2O–ZnO–P2O5 Melt
Pleiades Publishing Ltd - Tập 29 - Trang 35-41 - 2003
G. G. Boiko, A. V. Parkachev
The specific features of the dynamics of structure-forming ions in an Na2O · ZnO · P2O5 melt are studied by the molecular dynamics method in the ion approximation of the interparticle interaction potential. It is shown that the oxygen diffusion mechanism in the pyrophosphate system is generally similar to that investigated previously for silicate systems. The main difference of the former mechanis...... hiện toàn bộ
Influence of Modification of Porous Glass with Zinc Oxide on Its Photocatalytic Properties
Pleiades Publishing Ltd - - 2023
А. С. Саратовский, М. А. Гирсова, И. Н. Анфимова, Andrey Moskalev, E. S. Motailo, Т. В. Антропова
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
Crystallization and thermal transformations in nanocrystals of the YPO4-LuPO4-H2O system
Pleiades Publishing Ltd - Tập 33 - Trang 169-173 - 2007
A. V. Osipov, L. P. Mezentseva, I. A. Drozdova, S. K. Kuchaeva, V. L. Ugolkov, V. V. Gusarov
Nanocrystals of yttrium lutetium phosphates of the general formula Y1−x LuxPO4 · nH2O are synthesized. The temperature dependence of the nanocrystal size is investigated in the range 200–1100°C. The formation of a series of continuous solid solutions belonging to the tetragonal crystal system is revealed, and the limits of their thermal stability are determined.
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
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