Synchrotron X-ray Diffraction Studies of Thermal Oxidation of Si and SiGe

2019 ◽  
Vol 19 (2) ◽  
pp. 479-493
Author(s):  
Takayoshi Shimura ◽  
Yuki Okamoto ◽  
Daisuke Shimokawa ◽  
Tomoyuki Inoue ◽  
Takuji Hosoi ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
X Ray Diffraction ◽  
X Ray

Influence of Time on Thermal Oxidation of CP-Ti Grade II at 850 °C

2014 ◽  
Vol 614 ◽  
pp. 35-40
Author(s):  
Bogdan Istrate ◽  
Corneliu Munteanu ◽  
Sorin Iacob Strugaru ◽  
Alexandru Barca ◽  
Carmen Biniuc ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Analytical Techniques ◽  
Phase Evolution ◽  
Thermal Treatments ◽  
X Ray Diffraction ◽  
Good Adhesion ◽  
X Ray ◽  
Thick Oxide Layer ◽  
Grade Ii ◽  
Cp Ti

The objective of this work is to understand the influence of time on thermal oxidation of CP-Ti Grade II at 850 oC. Thermal treatments were performed for 5 minutes, 15 minutes, 30 minutes, 60 minutes and 120 minutes of isothermal stage. The response of titanium to oxidation at same temperatures and various timings has been investigated, in terms of layer thickness, phase evolution. A variety of experimental and analytical techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM) and ball cratering test have been used to characterize the result of thermal oxidized surfaces. The results showed that oxygen diffused on Ti structure can produce a thick oxide layer with rutile (TiO2) between 3,50 and 10,34 microns, which exhibited good adhesion with the substrate.

Behavior of UO2 in the RBMK-1000 Spent Fuel under Oxidizing Conditions

2004 ◽  
Vol 824 ◽  
Author(s):  
A. B. Kolyadin ◽  
V. Ya. Mishin ◽  
K. Ya. Mishin ◽  
A. S. Aloy ◽  
T. I. Koltsova
Keyword(s):  
Thermal Oxidation ◽  
Spent Nuclear Fuel ◽  
Oxidation Process ◽  
Spent Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dry Storage ◽  
Different Temperatures ◽  
Xrd Techniques

AbstractThe oxidation of UO2–type spent nuclear fuel (SNF) in gaseousmedia was studied at different temperatures and oxygen contents using gravimetric and powder X-ray diffraction (XRD) techniques. The aim of the study was to determine the mechanism(s) of thermal-oxidation alteration of SNF during long-term dry storage. The samples used in the experiments were chips of RBMK-1000 fuel rods.Oxidation of UO2with a mean burn-up of 10.7 and 19.73 MW d/kg in humid air was observed at a temperature as low as 150°C. At 200°C nearly all of the UO2was transformed into U3O8 between 3500-4000 hours. In a humid nitrogen environment containing of 0.05-1.3 vol. % oxygen at 300°C, the UO2 completely transformed to U3O8 between 2500-3000 hours. Oxidation of UO2in samples with small amounts of jacket damage (e.g., <0.04 MM2)ll progresses more slowly and after â3000 hours the oxygen-to-uranium ratio was 2.56.Stabilization of the oxidation process was not observed in the fuel samples upto an O/U ratio of 2.4, which may be attributed to the smallburn-up of the fuel under investigation.

SURFACE MORPHOLOGY AND X-RAY DIFFRACTION ANALYSIS FOR SILICON NANOCRYSTAL-BASED HETEROSTRUCTURES

2013 ◽  
Vol 20 (05) ◽  
pp. 1350046 ◽  
Author(s):  
EVAN T. SALIM
Keyword(s):  
Surface Morphology ◽  
Thermal Oxidation ◽  
Oxidation Process ◽  
Oxidation Temperature ◽  
Silicon Nanocrystal ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rapid Thermal Oxidation ◽  
O Phase ◽  
Thermal Oxidation Process

In this work, we studied the effect of rapid thermal oxidation process on the structural and surface morphology of silicon nanocrystal-based heterostructures. PLD technique was employed in combination with rapid thermal oxidation process to form multilayers heterostructures. Results show the dependence of the surface roughness and structure on the oxidation temperature. Best surface morphology was achieved at 723 K oxidation temperature, at which, the X-ray diffraction result ensured the formation of the Cu 2 O phase at (111) and (002) diffraction plain with uniform porous surface.

Zinc Oxide Nanostructures Synthesized by Thermal Oxidation of Zinc Powder on Si Substrate

2013 ◽  
Vol 328 ◽  
pp. 710-714 ◽  
Author(s):  
Suttinart Noothongkaew ◽  
Supakorn Pukird ◽  
Worasak Sukkabot ◽  
Bualoy Kasemporn ◽  
Prayoon Songsiririttikul ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Oxidation Process ◽  
Zinc Powder ◽  
Zinc Oxide Nanostructures ◽  
X Ray Diffraction ◽  
Average Width ◽  
X Ray ◽  
Oxide Nanostructures ◽  
Different Temperatures ◽  
Higher Temperature

ZnO nanowhiskers were formed by a simple oxidation of metallic zinc powder 99.9% at different temperatures from 400-900 °C for 2 hours on the silicon substrate. The result can be obtained after the thermal oxidation process, the ZnO nanowhiskers with different morphologies at different temperatures in which these morphologies and composition of ZnO nanostructures were characterized by scanning electron microscope, (SEM) and X-ray diffraction, XRD. It was found that the products were nanowhiskers, the structure are triangular shapes with average width of 10-50 nm at the root, 10-30 nm at the tip and length in the range of 1-3 μm was observed by SEM. Temperature in the range of 600-700 °C was suitable for the preparation of ZnO nanowhiskers. At higher temperature of 800 °C, the concentrations of ZnO structures become lower and stronger. At the oxidized temperature of 900 °C, ZnO nanowhiskers were not found and surface morphology become to porous. These results indicate that the oxidation rate is faster than the diffusion rate of Zn vapor on the surface of ZnO nuclei.

Synthesis of Visible-Light Active Monoclinic WO3 by Thermal Oxidation of Tungsten Powder for Photoreduction of Cr(VI)

2020 ◽  
Vol 1010 ◽  
pp. 405-410
Author(s):  
Nurulhuda Bashirom ◽  
Qiao Ling Lee
Keyword(s):  
Visible Light ◽  
Thermal Oxidation ◽  
Oxygen Vacancies ◽  
Tungsten Powder ◽  
X Ray Diffraction ◽  
Oxide Interfaces ◽  
X Ray ◽  
Air Atmosphere ◽  
Visible Light Active ◽  
Scanning Electron

In this paper, visible-light-active monoclinic WO3 powders were synthesized by thermal oxidation of W powders at 200 – 1000 °C in air atmosphere. Morphology and crystal structure of annealed W powders were characterized by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD), respectively. Based on SEM and XRD results, a spherical orthorhombic-W3O8 obtained at 200 °C was transformed into a dendritic monoclinic WO2 + tetragonal WO3 + monoclinic WO3 structures at 400 °C accompanied by a color transition from grey into green. At 600 °C, yellow monoclinic WO3 + monoclinic WO2.96 powder was produced that ascribed to oxygen vacancies. Photocatalytic activity of annealed W powders demonstrated 70.7% Cr (VI) removal after 150 min on sample annealed at 1000 °C. This ascribed to high photoactivity of monoclinic WO3. Nevertheless, the dendritic monoclinic WO2 + tetragonal WO3 + monoclinic WO3 obtained at 400 °C exhibited the lowest Cr (VI) photoreduction i.e. 45.2% implies less photoactive monoclinic WO2 and sluggish electron transport at oxide-oxide interfaces.

scholarly journals Structural, Optical and Photoelectrochemical Properties of Cuprous Oxide Synthesized by Low Temperature Thermal Oxidation

2016 ◽  
Vol 13 (1) ◽  
pp. 01-06
Author(s):  
A. A Ogacacho ◽  
B. O. Aduda
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Thermal Oxidation ◽  
Ultrathin Films ◽  
Cuprous Oxide ◽  
Photoelectrochemical Properties ◽  
X Ray Diffraction ◽  
Cooling Process ◽  
X Ray ◽  
Dominant Phase

Ultrathin films (50-150nm thick) cuprous oxide (Cu2O) thin films were deposited by low temperature thermal oxidation technique. The structural, optical and photoelectrochemical properties of the thin films were investigated. X-ray diffraction (XRD) and high resolution scanning electron microscope (SEM) was used to study the phase composition and the thin films’ microstructure respectively. XRD results showed that Cu2O was the dominant phase albeit some trace CuO peaks were also observed indicating surface formation of an extremely layer of CuO probably during the cooling process following either deposition or during the annealing steps. SEM showed a highly nanostructure consisting long narrow nanorods with broadening to the surface but with extremely narrow, sharp cylindrical roots standing on the substrate. Photoelectrochemical properties of the films were studied via a standard three electrode using a saturated calomel cell (SCE).

scholarly journals ON THE PHOTOLUMINESCENCE AND OPTICAL PROPERTIES OF ZINC OXIDE THIN FILMS PREPARED BY THERMAL OXIDATION

2018 ◽  
Vol 24 (3) ◽  
Author(s):  
DRAGOȘ-IOAN RUSU
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Thermal Oxidation ◽  
Structural Investigation ◽  
Structural Parameters ◽  
Zno Thin Films ◽  
Metallic Zinc ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray

Zinc oxide (ZnO) thin films were prepared by thermal oxidation of vacuum evaporated metallic zinc films. Some structural investigation, performed by X-ray diffraction technique, showed that films are polycrystalline and have a würtzite structure. We also determined some structural parameters of the films. The optical absorption was studied in the wavelength range from 300 nm to 1700 nm. Photoluminescence spectra at temperatures 293 K and 78 K have been analysed.

scholarly journals Effect of Annealing Temperature on Cu2O Thin Films Prepared by Thermal Oxidation Method

2020 ◽  
Vol 36 (2) ◽  
Author(s):  
Tran Thi Ha ◽  
Nguyen Thi Huyen Trang ◽  
Bach Thanh Cong ◽  
Nguyen Thi Dieu Thu ◽  
Nguyen Thanh Binh ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Oxidation ◽  
Annealing Temperature ◽  
Reflectance Spectroscopy ◽  
Phase Identification ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Oxidation Method ◽  
X Ray ◽  
Cu2o Thin Films

We report a facile process to fabricate cuprous thin films by thermal oxidation of copper substrates. Structure and phase identification were studied by X-ray diffraction measurement and Raman spectroscopy. Scanning electron microscopy was utilized to study surface morphology of the as-fabricated thin films and optical properties of the samples were investigated by diffused reflectance spectroscopy. The study shows that cuprous thin films could be obtained by controlling annealing temperature in the region of 200-300 oC.

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