Cadmium dibromide (CdBr2) optical properties, dielectric constant

The goal of this study was to investigate the optical properties of the prepared polyvinyl chloride (PVC)/zinc oxide (ZnO) nanocomposite films. The PVC/ZnO nanocomposite films consist of the addition of different concentrations with both non-annealed ZnO nanoparticles and ZnO nanoparticles annealed at temperature of 700°C. The PVC/ZnO nanocomposite films by weight concentrations of (0 wt.%, 2.5 wt.%, 5 wt.% and 10 wt.%) have been prepared by the casting method. The optical absorbance and transmittance values of the composites films were measured in the wavelength range between (250 to 1100 nm) at room temperature by using the UV-1800 Shimadzu spectrophotometer. The optical properties (absorption coefficient, dielectric constant, refractive index, and optical conductivity) have been investigated by the ultraviolet (UV) spectrophotometer. The optical parameters (direct optical energy gap, excitation energy for electronic transitions, the dispersion energy, static refractive index, static dielectric constant, optical oscillator strengths, the moments of optical spectrum, linear optical susceptibility, third-order nonlinear optical susceptibility, nonlinear refractive index, high-frequency dielectric constant, the carrier concentration to the effective mass ratio, the long wavelength refractive index and the plasma frequency) were calculated. The results showed that the optical properties behavior of the PVC/ZnO nanocomposite films was found to be dependent on the ZnO concentration, and photon wavelength. In addition, the results of the study show that the optical parameters can be influenced by alter the concentration of the nonannealed and annealed a ZnO nanoparticle in the PVC polymer matrix.

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Study the Effect of Heat Treatment and Pressure on some the Optical Properties of the Pure PVA Nano Polymer

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.900.16 ◽

2021 ◽

Vol 900 ◽

pp. 16-25

Author(s):

Tabarak Mohammed Awad ◽

May A.S. Mohammed

Keyword(s):

Heat Treatment ◽

Dielectric Constant ◽

Refractive Index ◽

Optical Properties ◽

Absorption Coefficient ◽

Polyvinyl Alcohol ◽

Complex Dielectric Constant ◽

Different Temperatures ◽

German Origin ◽

Increasing Temperature

In this study, some optical properties were studied of the pure vinyl polyvinyl alcohol (PVA) nanopolymer (German origin). Under the influence of different temperatures and pressures of PVA. Where 25 samples were prepared for the purpose of conducting the research. Which studied the study of these samples was done by recording the absorbance and transmittance spectra of the wavelengths (200-900) nm. From them, absorbance, transmittance, reflectivity, absorption coefficient, refractive index, extinction coefficient, complex dielectric constant were calculated. At different temperatures (25,40, 80, 120, 160)°C. And with different pressures within the range (7.5,8,8.5,9,9.5) MPa. The results are that the permeability of the polymer (PVA) at different temperatures for each pressure decreases with increasing temperature, and that all other calculated optical properties increase with increasing temperature.

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Preparation and Studying the Optical Properties of (Sb2o3) Thin Films

Journal of University of Babylon for Pure and Applied Sciences ◽

10.29196/jubpas.v26i10.1881 ◽

2018 ◽

Vol 26 (10) ◽

pp. 249-256

Author(s):

Waleed Khalid Kadhim

Keyword(s):

Thin Films ◽

Dielectric Constant ◽

Refractive Index ◽

Optical Properties ◽

Absorption Coefficient ◽

Thermal Evaporation ◽

Glass Slide ◽

Antimony Trioxide ◽

Hot Plate ◽

Different Thickness

In this paper I present the preparation of (Sb2o3) thin films using thermal evaporation in vacuum, procedure with different thickness (100 ,150 ,200 ,and 250) nm, by using ( hot plate) from Molybdenum matter at temperature in ( 9000c) and the period of time (15mint) ,the prepared in a manner thermal evaporation in a vacuum and precipitated on glass bases, pure Antimony Trioxide (sb2o3 ) thin films with various condition have been successfully deposited by (T.E.V) on glass slide substrates. The substrates temperature of about 100oC and the vacuum of about 10-6 torr, to investigated oxidation of evaporated, measure spectra for prepared films in arrange of wavelength (250 – 1100 nm). The following optical properties have been calculated: the absorption coefficient, the forbidden (Eg) for direct and indirect transitions "absorbance, refractive index, extinction coefficient, real and imaginary parts" of the dielectric constant.

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Empirical Relation for Electronic and Optical Properties of Binary Tetrahedral Semiconductors

East European Journal of Physics ◽

10.26565/2312-4334-2021-1-11 ◽

2021 ◽

Keyword(s):

Dielectric Constant ◽

Optical Properties ◽

Atomic Number ◽

Energy Gap ◽

Empirical Relation ◽

Average Energy ◽

Optical Parameters ◽

Dielectric Analysis ◽

Average Atomic Number ◽

Tetrahedral Semiconductors

The concept of ionicity has been developed by Phillips and Van Vechten from the dielectric analysis of the semiconductors and insulators to evaluate various bond parameters of binary tetrahedral (AIIBVI and AIIIBV) semiconductors. In this paper, an advance hypothesis of average atomic number of the elements in a compound has been used to evaluate intrinsic electronic and optical parameters such as ionic gap (Ec), average energy gap (Eg), crystal ionicity (fi) and dielectric constant (ϵ) of binary tetrahedral semiconductors.

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Моды волновода с пороговой нелинейностью

Письма в журнал технической физики ◽

10.21883/pjtf.2020.16.49854.18146 ◽

2020 ◽

Vol 46 (16) ◽

pp. 43

Author(s):

С.Е. Савотченко

Keyword(s):

Dielectric Constant ◽

Optical Properties ◽

Surface Waves ◽

Nonlinear Optical ◽

Layer Structure ◽

Finite Thickness ◽

Critical Value ◽

Field Structure ◽

Finite Width ◽

Border Regions

A three-layer structure consisting of a nonlinear optical medium with a stepwise change in the dielectric constant inside which there is a dielectric layer of finite thickness is considered. The surface waves of two types of symmetry with a special field structure can propagate along the layers. Domains of finite width with different optical properties in the border regions in a nonlinear medium are formed. The formation of domains, as well as the existence of surface waves, occurs at interlayer thicknesses not exceeding a certain critical value.

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

Baghdad Science Journal ◽

10.21123/bsj.8.2.561-565 ◽

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.

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