Effect of Post-Deposition Annealing on some Optical Properties of Thermally-Evaporated V2O5 Thin Film

2012 ◽  
Vol 329 ◽  
pp. 139-145
Author(s):  
S.A. Aly
Keyword(s):  
Optical Properties ◽  
Amorphous State ◽  
X Ray Diffraction ◽  
Post Deposition Annealing ◽  
X Ray ◽  
Spectral Behaviour ◽  
Before And After ◽  
Different Temperatures ◽  
Reflectance Measurements ◽  
Post Deposition

A Vanadium Pentoxide Sample with a Film Thickness of 75 Nm Has Been Thermally Evaporated on Unheated Glass Substrate Using V2O5High Purity Powder. the Sample Was Subjected to a Subsequent Post-Deposition Annealing in Air at Different Temperatures for a Period of One Hour. the Optical Properties Were Studied by Transmittance and Reflectance Measurements. the Integrated Visible ,TVis, and Solar, TSol, Transmittance Were Calculated. the Spectral Behaviour of the Refractive Index as Well as the Absorption Coefficient before and after Post-Deposition Heat-Treatment Was Also Reported. X-Ray Diffraction Confirmed that the Film in the as-Deposited as Well as after Annealing up to 400 °C Is in the Amorphous State.

Colossal Magnetoresistance in Thick La0.7Ca0.3MnO3 Films

1995 ◽  
Vol 384 ◽  
Author(s):  
Randolph E. Treece ◽  
P. Dorsey ◽  
M. Rubinstein ◽  
J. M. Byers ◽  
J. S. Horwitz ◽  
...  
Keyword(s):  
Colossal Magnetoresistance ◽  
Single Phase ◽  
Laser Deposition ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
Post Deposition Annealing ◽  
X Ray ◽  
Mr Effect ◽  
Deposited Films ◽  
Post Deposition

ABSTRACTThick films (0.6 and 2.0 μm) of the colossal magnetoresistance (CMR) material, La0.7Ca0.3MnO3 (LCMO), have been grown by pulsed laser deposition (PLD). The films were grown from single-phase LCMO targets in 100 mTorr 02 pressures and the material deposited on (100) LaAlO3 substrates at deposition temperatures of 800°C. The deposited films were characterized by X-ray diffraction (XRD), magnetic field-dependent resistivity, and Rutherford backscattering spectroscopy (RBS). The LCMO films were shown by XRD to adopt an orthorhombic structure. Brief post-deposition annealing led to ~50,000% and ~12,000% MR effect in the 0.6 μm and 2.0 μm films, respectively.

Thin Film Deposition and Transport in 2223 Bi‐Sr‐Ca‐Cu‐O

1989 ◽  
Vol 169 ◽  
Author(s):  
J.T. Kucera ◽  
D.G. Steel ◽  
D.W. Face ◽  
J.M. Graybeal ◽  
T.P. Orlando ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
X Ray Diffraction ◽  
Post Deposition Annealing ◽  
X Ray ◽  
Annealing Conditions ◽  
Sensitive Function ◽  
Post Deposition

AbstractWe have reproducibly prepared thin films of Bi‐Sr‐Ca‐Cu‐O with Tc ≥ 105K. Depositions were done at ambient temperature with a subsequent post‐deposition anneal, and did not include lead substitution. X‐ray diffraction data indicates a majority fraction of the 2223 phase. These films possess very large grains of the order of 20‐30 u.m in size. Post‐deposition annealing conditions are a sensitive function of composition. Detailed transport measurements as a function of temperature and magnetic field have been obtained.

Optical Characteristics of Tungsten Oxide Thin Films Prepared by Sputtering Technique

2010 ◽  
Vol 295-296 ◽  
pp. 11-17
Author(s):  
S.A. Aly
Keyword(s):  
Optical Properties ◽  
Tungsten Oxide ◽  
Energy Gap ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
Remarkable Change ◽  
X Ray ◽  
Glass Substrates ◽  
Tungsten Oxide Thin Films ◽  
Reflectance Measurements

The optical properties of tungsten oxide (WO3) films prepared by DC sputtering on unheated glass substrates with different film thicknesses have been studied. The structural characteristics of the samples were investigated using X-ray diffraction. The optical properties of the prepared films were studied by transmittance and reflectance measurements, and the integrated transmittance (TUV, TVIS, and TNIR) and absorption (AUV, AVIS, and ANIR) in UV, VIS and NIR regions. The integrated UV absorption and transmittance are varied with the film thicknesses, also, no remarkable change in VIS and NIR regions was observed. The dependence of refractive index as well as extinction coefficient on wavelength was also reported. The energy gap was calculated and is located around 3.25 eV.

Amorphous Calcium Phosphates (ACP): Formation and Stability

2005 ◽  
Vol 284-286 ◽  
pp. 7-10 ◽  
Author(s):  
Racquel Z. LeGeros ◽  
Dindo Q. Mijares ◽  
J. Park ◽  
X.-F. Chang ◽  
I. Khairoun ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Synergistic Effects ◽  
Calcium Phosphates ◽  
X Ray Diffraction ◽  
Solution Composition ◽  
X Ray ◽  
Dissolution Properties ◽  
Before And After ◽  
Different Temperatures

Our earlier studies showed that several ions inhibit the crystal growth of apatite and promote the formation of amorphous calcium phosphates (ACP). These ions include: magnesium (Mg), zinc (Zn), stannous (Sn), ferrous (Fe), carbonate (CO3), pyrophosphate (P2O7). The purpose of this study was to investigate the effect of combination of these ions (e.g., Mg & CO3, Mg & P2O7, Mg & Zn, etc) on the formation and stability of ACP. ACP compounds containing the different ions were prepared at 25 and 37oC according to the method we previously described. Chemical stability was investigated by suspending the different ACP preparations in solutions with or without inhibitory ions. Thermal stability was determined by sintering the ACP at different temperatures. Dissolution properties were determined in acidic buffer. The ACP before and after chemical or thermal treatment were analyzed using X-ray diffraction, infrared spectroscopy, and thermogravimetry. Results showed synergistic effects of inhibitory ions on the formation of ACP. ACP materials, regardless of their composition, remained amorphous even after heat treatment at 400oC. Transformation of ACP to other calcium phosphate phases depended on the pH and on the solution composition.

Structures and Optical Properties of Sm-Doped CuInTe2 Semiconductor

2015 ◽  
Vol 1094 ◽  
pp. 218-221
Author(s):  
Xiao Meng Nie ◽  
Yong Quan Guo
Keyword(s):  
Optical Properties ◽  
Raman Scattering ◽  
Electronic Structures ◽  
Chalcopyrite Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fluctuation Phenomenon ◽  
Before And After ◽  
Semiconducting Compounds ◽  
Special Frequencies

Since the rare earth based compounds have shown excellent properties such as luminescence and photo-electric transformation effect due to their 4f electronic structures. A novel Sm-doped CuIn1-xSmxTe2 semiconducting compounds have been designed and their crystal structures, microstructures and optical properties have been investigated using X-ray diffraction(XRD), scan electron microscopy (SEM), ultraviolet and visible spectrophotometer and Raman scattering. The results reveal that the doping of samarium into CuInTe2 (CIT) could stabilize the chalcopyrite structure, the lattice parameters shows fluctuation phenomenon with doping Sm in CIT. The SEM morphologies show that the grains tend to be agglomeration and form the column-like or the flake-like single crystals. The band gap Eg are corresponding to 1.25eV and 1.32eV before and after doping Sm with 0.1 mole into CuInTe2. Raman scattering analysis proves that Sm significantly adjusts the atomic vibrating models, and result in the losses of some vibrating peaks. It reveals that doping of Sm into CuInTe2 is helpful for the absorption of spectra with special frequencies.

Structural and Optical Properties of ZnO Film Precursors for Multilayered Transparent Solar Cell Electrodes

2015 ◽  
Vol 1132 ◽  
pp. 217-223
Author(s):  
E.R. Rwenyagila ◽  
B. Agyei-Tuffour ◽  
M.G.Z. Kana ◽  
O. Akin-Ojo ◽  
W.O. Soboyejo
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Rf Magnetron Sputtering ◽  
Zno Thin Films ◽  
X Ray Diffraction ◽  
Zno Film ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Deposition Power ◽  
Different Temperatures

This work examines the modification of the structural and optical properties of ZnO thin films by control of deposition and post-treatment parameters. ZnO thin films were deposited by RF magnetron sputtering from a ceramic target locally made at SHESTCO in Abuja, Nigeria. X-ray diffraction measurements characterized the different films prior to thermal annealing as extremely amorphous with average UV-VIS transmittance spectra between 80 and 90%. Annealing at different temperatures and time spans influenced the formation of Wurtzite (002) oriented ZnO crystallites. Contrary to the crystallinity of the films, which was strongly influenced by the deposition power, the optical transmission of the films was only slightly influenced by the deposition power and it was less sensitive to the crystallinity of ZnO thin films.

scholarly journals Study the effect by CO2 laser on some optical properties of (Cd) thin film doping by Ni

2008 ◽  
Vol 5 (3) ◽  
pp. 387-390
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Absorption Coefficient ◽  
Co2 Laser ◽  
Energy Gap ◽  
Hexagonal Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Cds Thin Films

In this research study the effect of irradiation by (CW) CO2 laser on some optical properties of (Cds) doping by Ni thin films of (1)µm thickness has been prepared by heat evaporation method. (X-Ray) diffraction technique showed the prepared films before and after irradiation are ploy crystalline hexagonal structure, optical properties were include recording of absorbance spectra for prepared films in the range of (400-1000) nm wave lengths, the absorption coefficient and the energy gap were calculated before and after irradiation, finally the irradiation affected (CdS) thin films by changing its color from the Transparent yellow to dark rough yellow and decrease the value absorption coefficient also increase the value of energy gap.

Structural, Optical and Microstructural Properties of TiNi Thin Films before and after Oxidation

2020 ◽  
Vol 835 ◽  
pp. 193-199
Author(s):  
Hanan Abouarab ◽  
Amal Kassry ◽  
Iman El-Mahallawi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Oxidation Process ◽  
Steel Substrate ◽  
Rf Magnetron Sputtering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Force ◽  
Before And After ◽  
Sputter Deposited

The deposition of composites with tailored optical properties is investigated. This would employ structures consisting of combined metallic and oxides nature. A thin layer of TiNi is obtained by using RF magnetron sputtering on a stainless-steel substrate, followed by oxidation at 400°C and 800°C for four and one hours, respectively. The optical properties of the thin films were characterized by optical 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 TiO2 has been produced through the oxidation process of the sputter-deposited TiNi thin film at high oxidation temperature. The TiNi thin films showed a significant improvement in optical properties after oxidation, as the absorbance increased, and the emittance was reduced. This work introduces oxidized TiNi thin films as candidates for solar selective absorber.

X-Ray Diffraction Patterns of Oil Palm Empty Fruit Bunch Fibers with Varying Crystallinity

2015 ◽  
Vol 1087 ◽  
pp. 321-328 ◽  
Author(s):  
Fatin Afifah Ahmad Kuthi ◽  
Khairiah Haji Badri ◽  
Azlin Mohmad Azman
Keyword(s):  
Acid Hydrolysis ◽  
Oil Palm ◽  
Empty Fruit Bunch ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Before And After ◽  
Different Temperatures ◽  
Diffraction Patterns ◽  
Xrd Patterns

Crystallinity of oil palm fiber from empty fruit bunch (EFB) with and without tretaments was studied by analyzing the X-ray diffraction (XRD) pattern. In this paper, we focused on the effect of acid hydrolysis onto EFB on the crystallinity of the extracted cellulose. The reaction was carried out by soaking EFB in 1% (v/v) aqueous sulfuric acid (H2SO4) at different temperatures of 120, 130 and 140°C for 1 h. The XRD patterns significantly showed changes in the 2θ peaks before and after the treatment. These changes were described in term of polymorphs type present, reflection and allomorphs of the samples. XRD peak high and XRD deconvolution methods were used to calculate and compare the percentage of crystallinity of untreated EFB (UT-EFB) and acid hydrolyzed samples (AH-EFB). Based on the calculation, increment of about 1.3 times and 1.5 times were achieved by using WAXS and XRD deconvolution methods respectively. This is due to the removal of amorphous part contributed by lignin, hemicellulose and cellulose. Fourier Transform infrared (FTIR) spectra showed the presence of similar peaks in AH-EFB and commercial microcrystalline cellulose (C-MCC) at 1427, 1315, 895 and 1022 cm-1. The micrographic features showed the acid hydrolysis had successfully took place and separated the EFB microfibrils bundles.

scholarly journals FACILE SYNTHESIS AND OPTICAL PROPERTIES OF PbO NANOSTRUCTURES

2014 ◽  
Vol 44 (2) ◽  
pp. 159-162
Author(s):  
R. YOUSEFI ◽  
F. JAMALI-SHEINI ◽  
M. CHERAGHIZADE ◽  
A. SA'AEDI
Keyword(s):  
Optical Properties ◽  
Visible Region ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
X Ray ◽  
Different Temperatures ◽  
Diffraction Patterns ◽  
Temperature Scanning ◽  
Nanoporous Surface ◽  
Lead Sheet

PbO nanostructures were synthesized by the oxidation of lead sheets in a tube furnace under oxygen ambient using different temperatures, from 280 °C to 450 °C. X-ray diffraction patterns (XRD) indicated the formation of α-PbO nanostructures from the lead sheet with an increase in the temperature. Scanning electron microscope (SEM) results showed that flake-like shapes were starting to grow on the lead sheet that was placed in the 280 °C. In addition, the SEM studies showed nanoflake and nanoporous morphologies for the lead sheets that were placed at 330 °C and 450 °C, respectively. Raman measurements confirmed the XRD results and indicated two Raman active modes that belonged to the α-PbO phase for the nanoflakes and the nanoporous surface. The optical properties of the products were characterized using a photoluminescence (PL) technique. The PL results for the PbO nanoflakes and nanopores showed a peak in the visible region.

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