Reduction of electron trapping in silicon dioxide by high‐temperature nitrogen anneal

1981 ◽  
Vol 52 (9) ◽  
pp. 5691-5695 ◽  
Author(s):  
S. K. Lai ◽  
D. R. Young ◽  
J. A. Calise ◽  
F. J. Feigl
Keyword(s):  
High Temperature ◽  
Silicon Dioxide ◽  
Electron Trapping

Luminescence Properties of Electron Trapping Material CaB4O7:Sm3+

2012 ◽  
Vol 502 ◽  
pp. 116-119 ◽  
Author(s):  
Jia Yue Sun ◽  
Wei Zhang ◽  
Hai Yan Du
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Solid State Reaction ◽  
Glow Curve ◽  
Room Temperature ◽  
Luminescent Properties ◽  
Stimulated Emission ◽  
Electron Trapping ◽  
Characteristic Emission ◽  
Exciting Source

A novel electron trapping material of CaB4O7:Sm3+ was synthesized by high temperature solid-state reaction, and its characterization and luminescent properties were investigated at room temperature. The results indicate that ultraviolet light can be used as exciting source to store energy. After exposed under ultraviolet, the sample was stimulated by 980nm laser. As a result, an obvious luminescence at 556, 596 and 643 nm were detected. The photo-stimulated emission spectrum was three bands peaking at 562, 599 and 646 nm that are the characteristic emission of Sm3+ ions due to the f→f transitions 4G5/2→6HJ (J = 5/2, 7/2, 9/2), respectively. The TL glow curve contains two overlapping glow peaks at around 541 and 598 K.was synthesized by high temperature solid-state reaction, and its characterization and luminescent properties were investigated at room temperature. The results indicate that ultraviolet light can be used as exciting source to store energy. After exposed under ultraviolet, the sample was stimulated by 980nm laser. As a result, an obvious luminescence at 556, 596 and 643 nm were detected. The photo-stimulated emission spectrum was three bands peaking at 562, 599 and 646 nm that are the characteristic emission of Sm3+ ions due to the f→f transitions 4G5/2→6HJ (J = 5/2, 7/2, 9/2), respectively. The TL glow curve contains two overlapping glow peaks at around 541 and 598 K.

Production of Nanosilica from Iron Tailing and Characterization

2011 ◽  
Vol 295-297 ◽  
pp. 282-285
Author(s):  
Feng Feng Li ◽  
Ming Xi Zhang ◽  
Yi Shen ◽  
Du Jiao ◽  
Gui Qin Hou ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
High Temperature ◽  
Silicon Dioxide ◽  
Chemical Deposition ◽  
Deposition Method ◽  
Analysis Techniques ◽  
Chemical Deposition Method ◽  
Ft Ir ◽  
Thermal Analysis Techniques ◽  
Amorphous Matter

Nanosilica was extracted from iron tailing by the chemical deposition method, involving pickling, filters washing, alkali dissolving of pickling dregs in high temperature, precipitating silica controlled by diluted acid and so on. The product has been studied by SEM, XRD, FT-IR, and thermal analysis techniques, etc. These study shows that the nanosilica is a kind of amorphous matter consists of hydrous silicon dioxide (97.076%) with small amount of sodium and aluminum trapped inside the Si–O network. The diameter of globular silica particles is 30-50 nm.

Aluminum Nitride Micro-Channels Grown via Metal Organic Vapor Phase Epitaxy for MEMs Applications

2007 ◽  
Vol 1040 ◽  
Author(s):  
L. E. Rodak ◽  
Sridhar Kuchibhatla ◽  
P. Famouri ◽  
Ting Liu ◽  
D. Korakakis
Keyword(s):  
High Temperature ◽  
Aluminum Nitride ◽  
Silicon Dioxide ◽  
Vapor Phase ◽  
High Energy ◽  
Vapor Phase Epitaxy ◽  
Micro Channel ◽  
Organic Vapor ◽  
Micro Channels ◽  
Metal Organic

AbstractAluminum nitride (AlN) is a promising material for a number of applications due to its temperature and chemical stability. Furthermore, AlN maintains its piezoelectric properties at higher temperatures than more commonly used materials, such as Lead Zirconate Titanate (PZT) [1, 2], making AlN attractive for high temperature micro and nano-electromechanical (MEMs and NEMs) applications including, but not limited to, high temperature sensors and actuators, micro- channels for fuel cell applications, and micromechanical resonators.This work presents a novel AlN micro-channel fabrication technique using Metal Organic Vapor Phase Epitaxy (MOVPE). AlN easily nucleates on dielectric surfaces due to the large sticking coefficient and short diffusion length of the aluminum species resulting in a high quality polycrystalline growth on typical mask materials, such as silicon dioxide and silicon nitride [3,4]. The fabrication process introduced involves partially masking a substrate with a silicon dioxide striped pattern and then growing AlN via MOVPE simultaneously on the dielectric mask and exposed substrate. A buffered oxide etch is then used to remove the underlying silicon dioxide and leave a free standing AlN micro-channel. The width of the channel has been varied from 5 ìm to 110 ìm and the height of the air gap from 130 nm to 800 nm indicating the stability of the structure. Furthermore, this versatile process has been performed on (111) silicon, c-plane sapphire, and gallium nitride epilayers on sapphire substrates. Reflection High Energy Electron Diffraction (RHEED), Atomic Force Microscopy (AFM), and Raman measurements have been taken on channels grown on each substrate and indicate that the substrate is influencing the growth of the AlN micro-channels on the SiO2 sacrificial layer.

The Influence of Dy3+ in the Novel Electron Trapping Materials (ETM) (ETM) SrS: Eu2+, Dy3+

2010 ◽  
Vol 663-665 ◽  
pp. 429-433
Author(s):  
Jia Yue Sun ◽  
Zhen Xing Liu ◽  
Hai Yan Du
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Visible Light ◽  
Solid State Reaction ◽  
Emission Peak ◽  
Electron Trapping ◽  
The Novel ◽  
Peak Intensity ◽  
Broadband Spectrum ◽  
Exciting Source

A new electron trapping materials (ETM) SrS: Eu2+, Dy3+, which was prepared by the method of high temperature solid-state reaction. The results indicate that both ultraviolet light and visible light can be used as exciting source to store energy. After exposed under ultraviolet, the sample was stimulated by 980nm laser. As a result, an obvious luminescence at 615 nm was detected. The up-conversion emission spectrum was found to be a continuous broadband spectrum resulted from the multi-transitions of Eu2+ 4f6→4f7 (8S7/2). The emission peak intensity of SrS: Eu2+, Dy3+ was stronger than SrS: Eu2+.

Oxidation of Pentatitanium Trisilicide (Ti5Si3) Powder at High Temperature

2016 ◽  
Vol 868 ◽  
pp. 38-42 ◽  
Author(s):  
Jun-Ichi Matsushita ◽  
Tatsuki Satsukawa ◽  
Naoya Iwamoto ◽  
Xiao Ling Wang ◽  
Jian Feng Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Silicon Dioxide ◽  
Oxidation Resistance ◽  
Surface Film ◽  
High Hardness ◽  
Mass Gain ◽  
Titanium Silicide ◽  
High Melting Point ◽  
Oxidation Resistant ◽  
Resistant Layer

The oxidation of pentatitanium trisilicide (Ti5Si3) powder at high temperature was investigated in order to determine the suitability of this ceramic material for advanced application in an oxidation atmosphere at high temperature. Titanium silicide has been attracted for years as an engineering ceramics due to its high hardness, high melting point, and good chemical stability. The samples were oxidized from 300 to 1000 °C for 1 to 5 h in air. The mass changes were measured to estimate the oxidation resistance of the sample. The mass gain of the sample oxidized at 1000 °C for 5 h was about 26 % of the theoretical oxidation mass change. The commercial powder, Ti5Si3 showed an excellent oxidation resistance at 1000 °C, because the surface film of both titanium dioxide and silicon dioxide formed by oxidation acted as an oxidation resistant layer.

scholarly journals Characterization of magnetic biochar amended with silicon dioxide prepared at high temperature calcination

2016 ◽  
Vol 34 (3) ◽  
pp. 597-604 ◽  
Author(s):  
Shams Ali Baig ◽  
Zimo Lou ◽  
Malik T. Hayat ◽  
Ruiqi Fu ◽  
Yu Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Silicon Dioxide ◽  
Environmental Remediation ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Magnetic Biochar ◽  
Ft Ir ◽  
High Temperature Calcination

AbstractCalcination is considered to increase the hardness of composite material and prevent its breakage for the effective applications in environmental remediation. In this study, magnetic biochar amended with silicon dioxide was calcined at high temperature under nitrogen environment and characterized using various techniques. X-ray diffraction (XRD) analysis revealed elimination of Fe3O4 peaks under nitrogen calcination and formation of Fe3Si and iron as major constituents of magnetic biochar-SiO2 composite, which demonstrated its superparamagnetic behavior (>80 A2·kg−1) comparable to magnetic biochar. Thermogravimetric analysis (TGA) revealed that both calcined samples generated higher residual mass (>96 %) and demonstrated better thermal stability. The presence of various bands in Fourier transform infrared spectroscopy (FT-IR) was more obvious and the elimination of H–O–H bonding was observed at high temperature calcination. In addition, scanning electron microscopy (SEM) images revealed certain morphological variation among the samples and the presence of more prominent internal and external pores, which then judged the surface area and pore volume of samples. Findings from this study suggests that the selective calcination process could cause useful changes in the material composites and can be effectively employed in environmental remediation measures.

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