Indium sulphide (In2S3) thin films were deposited by vacuum thermal evaporation a base pressure o... more Indium sulphide (In2S3) thin films were deposited by vacuum thermal evaporation a base pressure of 1.5times10-5 mbar. The structural and optical properties of these films are studied by X-ray diffraction, X-ray reflectometry and optical transmission in the UV-Visible-Near infrared region. X-ray diffraction analysis showed that the as-deposited In2S3 films are amorphous. The measured optical transmission enabled the determination of the
ABSTRACT Thermal properties of polypyrrole/polymethylmethacrylate (PPy/PMMA) composites were anal... more ABSTRACT Thermal properties of polypyrrole/polymethylmethacrylate (PPy/PMMA) composites were analyzed by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). A decrease in the glass transition temperatures with PPy concentration reveals the increase of segmental motion. The dielectric properties of these composites were studied for several weight concentrations of PPy in the frequency range between 500 Hz and 0.2 MHz, over the temperature range 23-110 degrees C. Jonscher's phenomenological model has been used for modeling the dielectric response of the composite materials. This study shows that the results obtained for the dielectric response are in good agreement with the results of TGA and DSC measurements.
Barium–strontium titanate, Ba1−xSrxTiO3 (BST), is a continuous solid solution between barium tita... more Barium–strontium titanate, Ba1−xSrxTiO3 (BST), is a continuous solid solution between barium titanate, BaTiO3, and strontium titanate, SrTiO3, over the whole composition range. The Curie temperature (TC) of this system increases with the concentration of Sr in the BaTiO3 lattice, and hence can be tailored through different Ba/Sr molar ratios to obtain a desired TC.In this work we present dielectric permittivity for the system Ba1−xSrxTiO3, with 0≤x≤1, at 2.7GHz. The measurements were made using the small perturbation method, where resonance frequency and the quality factor of a cavity, with and without the sample, were used to calculate the complex dielectric permittivity, ε*=ε′−iε″, of the material.
Indium sulphide (In2S3) thin films were deposited by vacuum thermal evaporation a base pressure o... more Indium sulphide (In2S3) thin films were deposited by vacuum thermal evaporation a base pressure of 1.5times10-5 mbar. The structural and optical properties of these films are studied by X-ray diffraction, X-ray reflectometry and optical transmission in the UV-Visible-Near infrared region. X-ray diffraction analysis showed that the as-deposited In2S3 films are amorphous. The measured optical transmission enabled the determination of the
ABSTRACT Thermal properties of polypyrrole/polymethylmethacrylate (PPy/PMMA) composites were anal... more ABSTRACT Thermal properties of polypyrrole/polymethylmethacrylate (PPy/PMMA) composites were analyzed by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). A decrease in the glass transition temperatures with PPy concentration reveals the increase of segmental motion. The dielectric properties of these composites were studied for several weight concentrations of PPy in the frequency range between 500 Hz and 0.2 MHz, over the temperature range 23-110 degrees C. Jonscher's phenomenological model has been used for modeling the dielectric response of the composite materials. This study shows that the results obtained for the dielectric response are in good agreement with the results of TGA and DSC measurements.
Barium–strontium titanate, Ba1−xSrxTiO3 (BST), is a continuous solid solution between barium tita... more Barium–strontium titanate, Ba1−xSrxTiO3 (BST), is a continuous solid solution between barium titanate, BaTiO3, and strontium titanate, SrTiO3, over the whole composition range. The Curie temperature (TC) of this system increases with the concentration of Sr in the BaTiO3 lattice, and hence can be tailored through different Ba/Sr molar ratios to obtain a desired TC.In this work we present dielectric permittivity for the system Ba1−xSrxTiO3, with 0≤x≤1, at 2.7GHz. The measurements were made using the small perturbation method, where resonance frequency and the quality factor of a cavity, with and without the sample, were used to calculate the complex dielectric permittivity, ε*=ε′−iε″, of the material.
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Papers by A. Oueriagli