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SMN,
Elektrokjemi
Publikasjonar
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Ma, Yan; Jiang, Bo; Moosavi-Khoonsari, Elmira; Andersson, Stefan; Opila, Elizabeth J. & Tranell, Gabriella
(2019).
Oxidation of Liquid Silicon in Air Atmospheres Containing Water Vapor.
Industrial & Engineering Chemistry Research.
ISSN 0888-5885.
58(16),
s. 6785–6795.
doi:
10.1021/acs.iecr.9b00313.
Vis sammendrag
The oxidation of silicon (Si) has been extensively investigated over the past 50 years. Yet, an understanding of the mechanism and rate of liquid Si oxidation in atmospheres containing water vapor, is lacking. The effect of water vapor on the oxidation process is of particular importance in the industrial, metallurgical production and processing of liquid silicon, as a significant amount of silica fume is generated under such conditions. The generation of fume is due to the active oxidation of liquid metal in the tapping, refining, and casting steps—a major occupational health and safety challenge for the Si producers. In this work, the effect of water vapor in the atmosphere on the Si oxidation rate and fume characteristics was investigated experimentally at 1823 K in air–H2O atmospheres. Compared with oxidation in dry air, the rate of oxidation in wet air is higher, and increases to 3-fold compared to that of dry air with increasing water vapor content at 7 kPa, above which the alloy surface was passivated and the oxidation rate stable. To explain the experimental observations, Si oxidation reactions in wet atmosphere were modeled by FactSage 7.1 thermochemical software, by density functional theory (DFT) calculations, and by estimates of detailed reaction thermochemistry and kinetics using statistical thermodynamics and statistical mechanics methods. The increased rate of fuming was explained by the formation of Si–O–H species in the system and the more “sticky” nature of the H2O molecule on the Si surface as compared to the O2 molecule, yielding a higher degree of oxygen utilization toward active Si oxidation, that is, SiO formation.
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Jiang, Bo; Ræder, Trygve Magnus; Lin, De-Ye; Grande, Tor & Selbach, Sverre Magnus
(2018).
Structural Disorder and Coherence across the Phase Transitions of Lead-Free Piezoelectric Bi0.5K0.5TiO3.
Chemistry of Materials.
ISSN 0897-4756.
30(8),
s. 2631–2640.
doi:
10.1021/acs.chemmater.7b05278.
Fulltekst i vitenarkiv
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Jiang, Bo; Grande, Tor & Selbach, Sverre Magnus
(2017).
Local Structure of Disordered Bi0.5K0.5TiO3 Investigated by Pair Distribution Function Analysis and First-Principles Calculations.
Chemistry of Materials.
ISSN 0897-4756.
29(10),
s. 4244–4252.
doi:
10.1021/acs.chemmater.7b00276.
Fulltekst i vitenarkiv
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Wang, Luyang; Sun, Xinwei; Jiang, Bo & Norby, Truls
(2024).
Minority bulk and surface proton conduction in ceramic positrodes for proton ceramic electrochemical cells.
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Jiang, Bo; Skjærvø, Sandra Helen; Meier, Quintin Noel; Božin, Emil S.; Billinge, Simon J. L. & Feygenson, Mikhail
[Vis alle 9 forfattere av denne artikkelen]
(2018).
Combined total scattering and first principles approach to understand structural disorder in Bi0.5K0.5TiO3 and h-YMnO3.
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Vullum-Bruer, Fride; Wang, Lu; Asheim, Karina; Svensson, Ann Mari; Jiang, Bo & Vullum, Per Erik
(2017).
On intercalation and pseudocapacitance in Mg-ion battery electrodes.
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Jiang, Bo; Grande, Tor & Selbach, Sverre Magnus
(2017).
Local structure analysis of (1-x)BKT-xBFO using X-ray pair distribution method.
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Jiang, Bo; Grande, Tor & Selbach, Sverre Magnus
(2017).
Temperature dependence of the local structural disorder in Bi0.5K0.5TiO3.
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Jiang, Bo; Grande, Tor & Selbach, Sverre Magnus
(2017).
Local structure of disordered Bi0.5K0.5TiO3.
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Jiang, Bo; Grande, Tor & Selbach, Sverre Magnus
(2016).
Local structural disorder of Bi0.5K0.5TiO3 investigated by pair distribution function and first principle calculations.
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Jiang, Bo & Selbach, Sverre Magnus
(2015).
Local Structure of doped BiFeO3
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Jiang, Bo & Selbach, Sverre Magnus
(2015).
Relationship Between A/B-site Occupancy and Local Structure of Bi0.5K0.5TiO3-BiFeO3.
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Jiang, Bo & Selbach, Sverre Magnus
(2015).
Relationship Between A/B-SITE Occupancy and Local Structure of Bi0.5K0.5TiO3-BiFeO3.
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Publisert
22. nov. 2023 15:05
- Sist endra
3. juni 2024 10:15