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    Wyświetlanie 1-8 z 8
    Tytuł:
    Stabilization Studies of Crystal Structure of Optimally Th-Doped Lead Zirconate Perovskite
    Autorzy:
    Elsabawy, Khaled M.
    El-Hawary, Waheed F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191373.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Crystal Structure
    Doping
    Perovskite
    Visualization
    XRD
    Opis:
    The optimally thorium-doped Pb0.9Th0.1ZrO3 was selected for studying thorium doping effect on the structural parameters of lead zirconate crystal. The investigations were made on the low concentrations range of thorium doping 0.0 ≤ x ≤ 0.25 mole. The present investigations are concerned by confirming that thorium dopings play an important role as stabilizing agent inside internal structure of crystal lattice of Pb1-xThxZrO3 where x = 0.1 mole. XRD-measurements indicated that Thorium dopant substitutes successfully on the A-sites of lead zirconate without damaging the main crystal structure at x = 0.1 mole. Visualization and theoretical investigations were concerned by matching and comparison of bond distances ,torsions on angles of investigated compound to clarify success of thorium doping on the perovskite structure.
    Źródło:
    World Scientific News; 2016, 33; 56-66
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An overview of current research trends on graphene and it’s applications
    Autorzy:
    Krishna, R. S.
    Mishra, Jyotirmoy
    Das, Shaswat Kumar
    Mustakim, Syed Mohammed
    Powiązania:
    https://bibliotekanauki.pl/articles/1068613.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Concrete
    Doping
    Electrical
    Graphene
    Material
    Mechanical
    Properties
    Sustainability
    Opis:
    Graphene is no doubt called a wonder-material due to its outstanding superlative traits. It has its application near about in every field. Its properties are extraordinary and different from any day-to-day material. Albeit bearing such qualities, its structure is rather simple than most individuals cerebrate of. It has a thickness of an atom. It is a two-dimensional carbon arranged in a honeycomb crystal structure. It could transmute the way we view, in numerous fields of science. Its applications can be an asset to a greener environment for which Graphene engineered cement/concrete composites have an immense potential in the present times when sustainable construction materials are the need of the hour. Graphene can act as a good adsorbent for pollutant abstraction due to its high surface area. Either alone or in coalescence with different materials, it very well may be used for the debasement or deliberation of a sizably voluminous assortment of contaminants through a few strategies. Incipient heights can be achieved as the list of operations for graphene is virtually illimitable. Utilization of graphene in the coming years will give inundating difference to current technologies. This paper fixates on the applications and developments of Graphene in fields like Electronics, Batteries, Filtration, Medicine, Construction, and Composites.
    Źródło:
    World Scientific News; 2019, 132; 206-219
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect Cd Doping on the Structural and Optical Properties of ZnO Thin Films
    Autorzy:
    Najim, J. A.
    Rozaiq, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412167.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ZnO thin films
    semiconductor doping
    optical properties
    structure properties
    Opis:
    ZnO thin films with Cd/Zn nominal ratios of 0 %, 1 %, 3 %, 5 %, and 7 % and thickness of 0.7 μm were prepared by chemical spray pyrolysis. X-ray diffraction patterns showed that the films have polycrystalline structures and peaks matching the hexagonal ZnO structure. Crystallite sizes ranged from about 35 nm to 87 nm. As the doping concentration increased, full width at half maximum values decreased and crystallite sizes increased. The UV-Vis spectra of the ZnO:Cd films showed high transparency in the visible region. The optical band gap of the ZnO:Cd films decreased from 3.255 eV to 3.17 eV with increasing Cd doping concentration. The transition type was direct, thereby allowing transition. The ZnO:Cd thin films were annealed at 400 °C, and annealing treatment showed improvements in the properties of the derived films.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 10, 2; 137-150
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Gamma Irradiation on the Optical Properties of Mg doped CdO Thin films deposited by Spray Pyrolysis
    Autorzy:
    Hassouni, M.H.
    Mishjil, K.A.
    Chiad, S.S.
    Habubi, N.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/412503.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    TCOs
    thin films
    optical properties
    doping film
    gamma radiation
    Opis:
    Thin films of CdO and 9 % Mg doped CdO doped have been prepared using spray pyrolysis technique. Transmission and absorption spectra were recorded in order to estimate these films. The deposited thin films were exposed to γ - rays. We have studied the transmission, absorptions and absorption coefficient as a function of photon energy before and after irradiation. The optical constants such as: reflectance, extinction coefficient, refractive index, real and imaginary parts of the dielectric constant and the electrical conductivity were calculated also.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 11; 26-37
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uranium - Doping Effects on Structural and Spectral Features of Vanadate Ceramics
    Autorzy:
    Elsabawy, Khaled M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192708.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    212 Vanadate
    Ceramic
    ESR
    IR
    Uranium Doping
    X- ray
    Opis:
    212-Vanadate ceramics with formula Bi2SrV2-xUxO9, where (0 ≤ x ≤ 0.6 mole ) were carefully synthesized by solution routes with sintering temperature at 880oC for 24 hrs. Structural analysis with XRD proved that uranium (IV)-dopant can substitute successfully until x = 0.55 mole on the Bi-layered perovskite crystal structure without damaging the original structure . It was observed that U – doping have slight to moderate effects on both ESR-signals and conduction mechanism of U-doped Bi-Sr-V-O regime. Electrical measurements indicated that the energy gap Eg and number of electrons in conduction band Ncb increase as the ratio of U doping increases from x = 0.05 till x = 0.6 mole respectively due to the increasing of paramagnetic character of uranium than vanadium.
    Źródło:
    World Scientific News; 2016, 30; 103-116
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesized and characterization of pure and Er+3 doped ZnO nanoparticles by using laser ablation in ethanol
    Autorzy:
    Ismail, Raid A.
    Habubi, Nadir F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191374.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    AFM
    Er doping
    Heterojunction
    XRD
    Zinc Oxide
    nanocollidal suspension
    Opis:
    Pulsed laser ablation in ethanol at room temperature with laser fluence 4.62 J/cm2 was employed to synthesize pure zinc oxide (ZnO) and Er- doped ZnO nanocolloidal suspension. The structural properties were determined by using x-ray diffraction (XRD) method and was confirmed its hexagonal wurtzite structure. The photoluminescence spectra (PL), AFM and FTIR measurement of the synthesized pure and Er-doped ZnO is carried out. The photoluminescence spectra measurements show that all the samples have ultraviolet emission and green emission and the surface granular morphology. The FTIR spectra indicate the existence of Zn-O, Er-O-Er and Er-O stretching modes. Al/ZnO/P-Si/Al and Al/Er-ZnO/P-Si/Al photodetectors hetrojunction has two peaks of response located at 650 nm for and 790 nm and the first peak shifted to 550nm for the doped hetrojunction with max sensitivity 0.7A/W. The maximum specific detectivity is 4.3×1012 W-1•cm•Hz-1 and 3×1012 W-1 •cm•Hz-1 for undoped and doped hetrojunctions respectively. The values of the built-in potentials 0.9 volt for Al/ZnO/P-Si/Al heterojunction and 0.6 volt for Al/Er-ZnO/P-Si/Al hetrojunction.
    Źródło:
    World Scientific News; 2016, 33; 67-78
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Heat Treatment on the Optical Properties of Cobalt Doped Stannic Oxide
    Autorzy:
    Hasan, J. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/411548.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    thin films
    chemical spray pyrolysis
    dilute magnetic semiconductor
    stannic oxide
    doping
    Opis:
    This study investigates The effect of annealing on The optical properties of (SnO2:Co) films prepared by spray pyrolysis (SP) technique at a glass substrate temperature (Ts = 773 K). The absorbance and transmittance spectra have been recorded in order to calculate the optical constant and the optical band gap energy of the films. It was found that the annealing affects all the parameters under investigations.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 9; 59-70
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Co Doping on Structural and Optical Properties of NiO Thin Films Prepared By Chemical Spray Pyrolysis Method
    Autorzy:
    Bakr, N. A.
    Salman, S. A.
    Shano, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412102.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    NiO thin films
    Co Doping
    Chemical Spray Pyrolysis
    Optical Properties
    Structural Properties
    Opis:
    In this work, nickel-cobalt oxide (Ni(1-x)CoxO) thin films, where x = 0, 4, 6 and 8 % have been successfully deposited on glass substrates by chemical spray pyrolysis (CSP) technique at substrate temperature of (400 °C) and thickness of about 300 nm. The structural and optical properties of these films have been studied using XRD, AFM, and UV-Visible spectroscopy. The XRD results showed that all films are polycrystalline in nature with cubic structure and preferred orientation along (111) plane. The crystallite size was calculated using Scherrer formula and it is found that the undoped NiO sample has maximum crystallite size (51.16 nm). AFM results showed homogenous and smooth thin films. The absorbance and transmittance spectra have been recorded in the wavelength range of (300-900) nm in order to study the optical properties. The optical energy gap for allowed direct electronic transition was calculated using Tauc equation. It is found that the band gap decreases as the Co-concentration increases and the band gap values were in the range of 3.58-3.66 eV and 3.58 eV for the prepared Nickel-Cobalt Oxide thin films. The Urbach energy increases as the Co-concentration increases and the Urbach. The optical constants including (absorption coefficient, real and imaginary parts of dielectric constant) were also calculated as a function of photon energy. Refractive index and extinction coefficient for Nickel- Cobalt Oxide thin films were estimated as a function of wavelength.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 41; 15-30
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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