Relevant bibliographies by topics / Thermally stimulated desorption

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Academic literature on the topic 'Thermally stimulated desorption'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Thermally stimulated desorption"

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Kalanda, Nikolay A. "Thermally stimulated oxygen desorption in Sr2FeMoO6-δ." Modern Electronic Materials 4, no. 1 (May 1, 2018): 1–5. http://dx.doi.org/10.3897/j.moem.4.1.33270.

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Polycrystalline Sr2FeMoO6-δ specimens have been obtained by solid state synthesis from partially reduced SrFeO2,52 and SrMoO4 precursors. It has been shown that during oxygen desorption from the Sr2FeMoO6-δ compound in polythermal mode in a 5%H2/Ar gas flow at different heating rates, the oxygen index 6-δ depends on the heating rate and does not achieve saturation at T = 1420 K. Oxygen diffusion activation energy calculation using the Merzhanov method has shown that at an early stage of oxygen desorption from the Sr2FeMoO6-δ compound the oxygen diffusion activation energy is the lowest Еа = 76.7 kJ/mole at δ = 0.005. With an increase in the concentration of oxygen vacancies, the oxygen diffusion activation energy grows to Еа = 156.3 kJ/mole at δ = 0.06. It has been found that the dδ/dt = f (Т) and dδ/dt = f (δ) functions have a typical break which allows one to divide oxygen desorption in two process stages. It is hypothesized that an increase in the concentration of oxygen vacancies Vo•• leads to their mutual interaction followed by ordering in the Fe/Mo-01 crystallographic planes with the formation of various types of associations.
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Kalanda, N. A. "Thermally stimulated oxygen desorption in Sr2FeMoO6-δ." Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering 21, no. 1 (June 22, 2019): 48–53. http://dx.doi.org/10.17073/1609-3577-2018-1-48-53.

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Polycrystalline Sr2FeMoO6-δ specimens have been obtained by solid state synthesis from partially reduced SrFeO2.52 and SrMoO4 precursors. It has been shown that during oxygen desorption from the Sr2FeMoO6-δ compound in polythermal mode in a 5%H2/Ar gas flow at different heating rates, the oxygen index 6–δ depends on the heating rate and does not achieve saturation at T = 1420 K. Oxygen diffusion activation energy calculation using the Merzhanov method has shown that at an early stage of oxygen desorption from the Sr2FeMoO6-δ compound the oxygen diffusion activation energy is the lowest Еа = 76.7 kJ/mole at δ = 0.005. With an increase in the concentration of oxygen vacancies, the oxygen diffusion activation energy grows to Еа = 156.3 kJ/mole at δ = 0.06. It has been found that the dδ/dt = f(Т) AND dδ/dt = f(δ) functions have a typical break which allows one to divide oxygen desorption in two process stages. It is hypothesized that an increase in the concentration of oxygen vacancies V ·· leads to their mutual interaction followed by ordering in the Fe/Mo–O1 crystallographic planes with the formation of various types of associations.
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Shleifman, D. E., D. Shaltiel, and I. T. Steinberger. "Thermally stimulated hydrogen desorption from zirconium and tantalum." Journal of Alloys and Compounds 223, no. 1 (May 1995): 81–86. http://dx.doi.org/10.1016/0925-8388(94)01497-3.

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4

Junker, K. H., Z. ‐J Sun, T. B. Scoggins, and J. M. White. "Thermally stimulated desorption of neutral CF3 from CF3I on Ag(111)." Journal of Chemical Physics 104, no. 10 (March 8, 1996): 3788–96. http://dx.doi.org/10.1063/1.471032.

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Kanishchev, V. N., and N. P. Katrich. "Thermally activated and electron-stimulated desorption of gases implanted in metals." Soviet Atomic Energy 61, no. 2 (August 1986): 593–97. http://dx.doi.org/10.1007/bf01123725.

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Volokitina, Tatyana L., Roman S. Laptev, Viktor N. Kudiiarov, Dmitriy V. Gvozdyakov, and Maria N. Babihina. "Investigation of Hydrogen Sorption-Desorption Processes at Gas-Phase Hydrogenation and Defects Formation in Titanium by Means of Electron-Positron Annihilation Techniques." Defect and Diffusion Forum 373 (March 2017): 317–23. http://dx.doi.org/10.4028/www.scientific.net/ddf.373.317.

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The results of hydrogen sorption and desorption processes investigation at commercially pure titanium alloy during hydrogenation at gas atmosphere are shown in this article. Titanium alloy hydrogenation at temperatures 350, 450 и 550 °С leads to δ-hydrides formation in samples’ volume. Hydrogen sorption rates were calculated on the linear parts of sorption curves and equal to 0.15·10-4 wt%/s at 350 °C, 0.86·10-4 wt%/s at 450 °C, 1.55·10-4 wt%/s at 550 °C. Phase transition in titanium-hydrogen system during thermally stimulated hydrogen desorption investigation by the means of short-wave diffraction of synchrotron radiation shows hydrides dissociation until 520-530 °C. Then α→β transition takes place until 690-720 °C and at this temperatures the phase transformation ends and additional hydrogen desorption peak appears in thermally stimulated hydrogen desorption curve. Defect structure at different hydrogen concentration investigation by the means of electron-positron annihilation techniques shows that hydrogen penetration into titanium leads to crystal lattice expansion. It initiates vacancy-type defects formation which reacts with hydrogen and forms defect-hydrogen complexes.
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7

Vigil, O., E. Vasco, and O. Zelaya-Angel. "Oxygen desorption process in CdS thin films studied by thermally stimulated current measurements." Materials Letters 29, no. 1-3 (November 1996): 107–10. http://dx.doi.org/10.1016/s0167-577x(96)00125-5.

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Pozdnyakov, A. O., B. M. Ginzburg, T. A. Maricheva, V. V. Kudryavtsev, and O. F. Pozdnyakov. "Thermally stimulated desorption of C60 and C70 fullerenes from rigid-chain polyimide films." Physics of the Solid State 46, no. 7 (July 2004): 1371–75. http://dx.doi.org/10.1134/1.1778466.

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9

Knat’ko, M. V., M. N. Lapushkin, and V. I. Paleev. "Thermally stimulated desorption of ionized particles from the oxygen-activated Na/Au surface." Technical Physics 49, no. 7 (July 2004): 905–8. http://dx.doi.org/10.1134/1.1778866.

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10

Raposo, Maria, Carlota Xavier, Catarina Monteiro, Susana Silva, Orlando Frazão, Paulo Zagalo, and Paulo António Ribeiro. "Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability." Photonics 8, no. 3 (March 4, 2021): 70. http://dx.doi.org/10.3390/photonics8030070.

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Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 ± 17 kJ/mol. Therefore, it is possible to conclude that PEI/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.
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Dissertations / Theses on the topic "Thermally stimulated desorption"

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Bruzzi, Mara, Riccardo Mori, Andrea Baldi, Ennio Carnevale, Alessandro Cavallaro, and Monica Scaringella. "Thermally Stimulated Currents in Nanocrystalline Titania." MDPI AG, 2018. http://hdl.handle.net/10150/627084.

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A thorough study on the distribution of defect-related active energy levels has been performed on nanocrystalline TiO2. Films have been deposited on thick-alumina printed circuit boards equipped with electrical contacts, heater and temperature sensors, to carry out a detailed thermally stimulated currents analysis on a wide temperature range (5-630 K), in view to evidence contributions from shallow to deep energy levels within the gap. Data have been processed by numerically modelling electrical transport. The model considers both free and hopping contribution to conduction, a density of states characterized by an exponential tail of localized states below the conduction band and the convolution of standard Thermally Stimulated Currents (TSC) emissions with gaussian distributions to take into account the variability in energy due to local perturbations in the highly disordered network. Results show that in the low temperature range, up to 200 K, hopping within the exponential band tail represents the main contribution to electrical conduction. Above room temperature, electrical conduction is dominated by free carriers contribution and by emissions from deep energy levels, with a defect density ranging within 10(14)-10(18) cm(-3), associated with physio- and chemi-sorbed water vapour, OH groups and to oxygen vacancies.
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Sano, Mitsuru, Takashi Hibino, Atsuko Tomita, Pilwon Heo, Toshio Kamiya, and Masahiro Nagao. "Proton Conduction in In^3 + -Doped SnP2O7 at Intermediate Temperatures." The Electrochemical Society, 2006. http://hdl.handle.net/2237/18425.

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3

Captain, Janine Elizabeth. "Non-thermal Interactions on Low Temperature Ice and Aqueous Interfaces." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6995.

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Electron-impact ionization of low-temperature water ice leads to H+, H2+, and H+(H2O)n=1-8 desorption. The threshold energy for ESD of H2+ from CI and H3O+ from PASW and ASW is 22 ± 3 eV. There is also a H2+ yield increase at 40 ± 3 eV and a 70 ± 3 eV threshold for ESD of H+(H2O)n=2-8 from PASW and ASW. H2+ production and desorption involves direct molecular elimination and reactive scattering of an energetic proton. Both of these channels likely involve localized two-hole one-electron and/or two-hole final states containing 4a1, 3a1 and/or 2a1 character. The 70 eV cluster ion threshold implicates either an initial (2a1-2) state localized on a monomer or the presence of at least two neighboring water molecules each containing a single hole. The resulting correlated two-hole or two-hole, one-electron configurations are localized within a complex and result in an intermolecular Coulomb repulsion and cluster ion ejection. The changes in the yields with phase and temperature are associated with structural and physical changes in the adsorbed water and longer lifetimes of excited state configurations containing a1 character. The dependence of the ESD cation yields on the local potential has been utilized to examine the details of HCl interactions on low temperature ice surfaces. The addition of HCl increases cluster ion yields from pure ice while decreasing H+ and H2+ yields. These changes reflect the changes in the local electronic potential due to the changing bond lengths at the surface of the ice as HCl ionizes and the surrounding water molecules reorient to solvate the ions. This work has been extended to ionic solutions at higher temperatures using a liquid jet and ultraviolet photoionization to interrogate the surface of aqueous ionic interfaces. Desorption of protonated water clusters and solvated sodium ion clusters were measured over a range of concentrations from NaCl, NaBr, and NaI solutions. The flux dependence indicated a multiple photon process and the proposed mechanism involves a Coulomb explosion resulting from the repulsion of nearby ions. The surface is investigated with regard to its importance in heterogeneous atmospheric chemistry.
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Reports on the topic "Thermally stimulated desorption"

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Yates, John T., and Jr. Electron Stimulated Desorption-Ion Angular Distribution (ESDIAD): A method for Imaging Chemical Bond Directions and Thermal Disorder in Adsorbed Species. Fort Belvoir, VA: Defense Technical Information Center, August 1993. http://dx.doi.org/10.21236/ada268888.

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