scholarly journals Investigation of Optical Properties and Radiation Stability of TiO2 Powders before and after Modification by Nanopowders of Various Oxides

2018 ◽  
Author(s):  
Mikhail M. Mikhailov ◽  
Vitaly V. Neshchimenko ◽  
Semyon A. Yuryev ◽  
Alexey N. Sokolovskiy
Keyword(s):  
Optical Properties ◽  
Radiation Stability ◽  
Before And After

Optical Properties of Nano-Structure Tungsten-Doped Vanadium Oxide

2012 ◽  
Author(s):  
W. B. Cai ◽  
F. Wang ◽  
Y. P. Miao ◽  
J. Wei ◽  
K. L. Zhang
Keyword(s):  
Optical Properties ◽  
Transition Temperature ◽  
Oxide Film ◽  
Vanadium Oxide ◽  
High Vacuum ◽  
Infrared Transmission ◽  
Dc Magnetron Sputtering ◽  
Nano Structure ◽  
Before And After ◽  
Deposited Film

Tungsten-doped vanadium oxide has been proved to decrease the transition temperature, which enables vanadium oxide film to be more promising. Besides, the nano-structure can improve the properties of the film when compared with the as-deposited film. In this letter, a nano-structure tungsten-doped vanadium oxide film is proposed. Tungsten-doped vanadium oxide film was deposited on the Si (400) substrate by DC magnetron sputtering. The doping level was controlled by adjusting the sputtering time. Then the as-deposited film was annealed to form a nano-structure film at the temperature of 500 °C for 1 h in high vacuum. The morphology and crystalline structure of such films were characterized by AFM and XRD, respectively. Optical properties of the films were tested by FTIR, mainly comparing the infrared transmission before and after annealing.

Optical properties and radiation stability of BaSO4 powders modified with ZrO2 nanoparticles

2018 ◽  
Vol 151 ◽  
pp. 266-270 ◽  
Author(s):  
M.M. Mikhailov ◽  
S.A. Yuryev ◽  
A.A. Lovitskiy
Keyword(s):  
Optical Properties ◽  
Radiation Stability ◽  
Zro2 Nanoparticles

scholarly journals Annealing Effect on Some Optical Properties of Cr2O3 Thin Films Prepared by Spray Pyrolysis Technique

2011 ◽  
Vol 8 (2) ◽  
pp. 561-565
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Refractive Index ◽  
Optical Properties ◽  
Absorption Coefficient ◽  
Spray Pyrolysis ◽  
Annealing Temperature ◽  
Spray Pyrolysis Technique ◽  
Annealing Effect ◽  
Before And After

Cr2O3 thin films have been prepared by spray pyrolysis on a glass substrate. Absorbance and transmittance spectra were recorded in the wavelength range (300-900) nm before and after annealing. The effects of annealing temperature on absorption coefficient, refractive index, extinction coefficient, real and imaginary parts of dielectric constant and optical conductivity were expected. It was found that all these parameters increase as the annealing temperature increased to 550°C.

scholarly journals Optical properties and radiation stability of SiO2∙nH2O powder modified by ZrO2 nanoparticles

2019 ◽  
pp. 187-188
Author(s):  
M.M. Mikhailov ◽  
◽  
S.A. Yuryev ◽  
A.N. Lapin ◽  
◽  
...  
Keyword(s):  
Optical Properties ◽  
Radiation Stability ◽  
Zro2 Nanoparticles

Impact of laboratory treatment with coloring and fluorescent liquids on the optical properties of zirconia before and after accelerated aging

2018 ◽  
Vol 120 (2) ◽  
pp. 276-281 ◽  
Author(s):  
Caroline Freitas Rafael ◽  
Paulo Francisco Cesar ◽  
Marcio Fredel ◽  
Ricardo de Souza Magini ◽  
Anja Liebermann ◽  
...  
Keyword(s):  
Optical Properties ◽  
Accelerated Aging ◽  
Before And After

Optical radiation stability of ZnO hollow particles

Nanoscale ◽  
2018 ◽  
Vol 10 (47) ◽  
pp. 22335-22347 ◽  
Author(s):  
Vitaly Neshchimenko ◽  
Chundong Li ◽  
Mikhail Mikhailov ◽  
Jinpeng Lv
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Optical Radiation ◽  
Radiation Stability ◽  
Hollow Particles

The research is focused on the effect of irradiation by protons and electrons on the optical properties’ stability of zinc oxide hollow particles as compared with ball, star and flower shaped particles, as well as micro- and nanocrystal powders.

scholarly journals Effect of Thermocycling, Surface Treatments and Microstructure on the Optical Properties and Roughness of CAD-CAM and Heat-Pressed Glass Ceramics

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 381 ◽  
Author(s):  
Roxana-Diana Vasiliu ◽  
Sorin Daniel Porojan ◽  
Mihaela Ionela Bîrdeanu ◽  
Liliana Porojan
Keyword(s):  
Surface Roughness ◽  
Optical Properties ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Ceramic Materials ◽  
Surface Treatments ◽  
Lithium Silicate ◽  
Before And After ◽  
Cad Cam

Dental ceramic restorations are widely spread nowadays due to their aesthetics and biocompatibility. In time, the colour and structure of these ceramic materials can be altered by aging processes. How does artificial aging affect the optical and surface roughness of ceramics? This study aims to assess the effect of thermocycling, surface treatments and microstructure upon translucency, opalescence and surface roughness on CAD-CAM and heat-pressed glass-ceramic. Forty-eight samples (1.5 mm thickness) were fabricated from six types of A2 MT ceramic: heat-pressed and milled glass-ceramic (feldspathic, lithium disilicate and zirconia reinforced lithium silicate). The samples were obtained respecting the manufacturer’s instructions. The resulted surfaces (n = 96) were half glazed and half polished. The samples were subjected to thermocycling (10,000 cycles) and roughness values (Ra and Rz), colour coordinates (L*, a*, b*) and microstructural analyses were assessed before and after thermocycling. Translucency (TP) and opalescence (OP) were calculated. Values were statistically analysed using ANOVA test (one way). TP and OP values were significantly different between heat-pressed and milled ceramics before and also after thermocycling (p < 0.001). Surface treatments (glazing and polishing) had a significant effect on TP and OP and surface roughness (p < 0.05). The heat-pressed and milled zirconia reinforced lithium silicate glass-ceramic experienced a loss in TP and OP. Ra and Rz increased for the glazed samples, TP and OP decreased for all the samples after thermocycling. Microstructural analyse revealed that glazed surfaces were more affected by the thermocycling and especially for the zirconia reinforced lithium silicate ceramic. Optical properties and surface roughness of the chosen ceramic materials were affected by thermocycling, surface treatments and microstructural differences. The least affected of the ceramics was the lithium disilicate ceramic heat-pressed polished and glazed.

scholarly journals Optical Properties and Microstructure of TiNxOy and TiN Thin Films before and after Annealing at Different Conditions

Coatings ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 22 ◽  
Author(s):  
Hanan A. Abd El-Fattah ◽  
Iman S. El-Mahallawi ◽  
Mostafa H. Shazly ◽  
Waleed A. Khalifa
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Pure Titanium ◽  
Rf Magnetron Sputtering ◽  
Visible Range ◽  
Optical Absorbance ◽  
Atomic Force ◽  
Before And After ◽  
Tin Thin Films ◽  
Steel Substrates

TiN and TiNxOy thin films share many properties such as electrical and optical properties. In this work, a comparison is conducted between TiN (with and without annealing at 400 °C in air and vacuum) and TiNxOy thin films deposited by using RF magnetron sputtering with the same pure titanium target, Argon (Ar) flow rate, nitrogen flow rates, and deposition time on stainless steel substrates. In the case of TiNxOy thin film, oxygen was pumped in addition. The optical properties of the thin films were characterized by spectrophotometer, and Fourier transform infrared spectroscopy (FTIR). The morphology, topography, and structure were studied by scanning electron microscope (SEM), atomic force microscope (AFM), and X-ray diffraction (XRD). The results show that both thin films have metal-like behavior with some similarities in phases, structure, and microstructure and differences in optical absorbance. It is shown that the absorbance of TiN (after vacuum-annealing) and TiNxOy have close absorbance percentages at the visible range of light with an unstable profile, while after air-annealing the optical absorbance of TiN exceeds that of TiNxOy. This work introduces annealed TiN thin films as a candidate solar selective absorber at high-temperature applications alternatively to TiNxOy.

Change in yhe Optical Properties of Sapphire Induced by Ion Implantation

1997 ◽  
Vol 504 ◽  
Author(s):  
D. Ila ◽  
E. K. Williams ◽  
S. Sarkisov ◽  
D. B. Poker ◽  
D. K. Hensley
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Full Width Half Maximum ◽  
Rutherford Backscattering Spectrometry ◽  
Full Width ◽  
Half Maximum ◽  
Transmission Electron ◽  
Before And After ◽  
Linear Optical Properties ◽  
Average Size

ABSTRACTWe have studied the formation of nano-crystals, after implantation of 2.0 MeV gold, 1.5 MeV silver, 160 keV copper and 160 keV tin into single crystal of A12O3. We also studied the change in the linear optical properties of the implanted Al2O3 before and after subsequent annealing by measuring the increase in resonance optical absorption. Applying Doyle's theory and the results obtained from Rutherford backscattering spectrometry (RBS) as well as the full width half maximum of the absorption band from Optical Absorption Photospectrometry (OAP), we measured the average size of the metallic clusters for each sample after heat treatment. The formation and crystallinity of the nanoclusters were also confirmed using transmission electron microscopy (TEM) technique.

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