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Wyszukujesz frazę "Co Doping" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-14 z 14
    Tytuł:
    Highly Compensated GaAs Crystal Obtained by Molecular CO Doping
    Autorzy:
    Bożek, R.
    Korona, K. P.
    Nowak, G.
    Wasik, D.
    Słupiński, T.
    Kaczor, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929707.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    78.55.-m
    78.20.Jq
    Opis:
    GaAs:C crystal was grown by liquid encapsulated Czochralski technique with large partial pressure of CO in ambient atmosphere p$\text{}_{CO}$/p$\text{}_{tot}$ = 0.2 and investigated using near and infrared absorption, photoluminescence, photoconductivity, photo-induced current transient spectroscopy and photo-Hall measurements. High resistivity of the crystal was found in electrical measurements (10$\text{}^{7}$ Ω cm, the Fermi level at 0.67 eV below conduction band at 300 K). Local vibrational mode revealed increased concentration of carbon acceptor and presence of oxygen related complexes. Photoluminescence spectra were dominated by two bands with peak energies at 1.49 eV and 0.8 eV. The near band gap emission shifts with excitation intensity up to 4 meV/decade. In photocurrent spectrum a strong photoionization band with E = 0.55 eV is observed.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 669-672
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Dielectric Properties of V and Y Disorder Doped SrBi2Nb2O9 Ceramics
    Autorzy:
    Afqir, Mohamed
    Elaatmani, Mohamed
    Zegzouti, Abdelouahad
    Tahiri, Nabiha
    Daoud, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/2174596.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    molten salt method
    Co-doping
    characterization
    Opis:
    Y and V codoped SrBi2Nb2O9 ceramics, which have been characterized by XRD, FTIR and SEM techniques, were prepared through molten salt using NaCl-KCl medium. Through X-ray diffraction analysis, all prepared samples were matched by undoped SrBi2Nb2O9. The lattice parameters do not depend on the amount of dopants. Under the optimized experimental conditions, the compounds are composed of small crystallites of varying size and orientation, resulting in many micros train defects. FTIR spectra revealed that the dopant promotes a slight decrease in the 612 cm-1 band. A plate-like morphology was revealed by scanning electron microscopy, while Nyquist plots indicate non-Debye relaxation for all compounds. V and Y were incorporated into SrBi2Nb2O9 lattice in order to reduce dielectric loss tangent. Thus, the codoping increases the of SrB1.9Y0.1Nb1.95V0.05O9 (Y0.1V0.05) ceramic whereas, they were significantly decreased in the case of SrB1.8Y0.2Nb2O9 (Y0.2) ceramic. Y0.1V0.05 sample makes up the highest efficient charge transfer, followed by Y0.2 sample representing the lowest.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1455--1458
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Co Doping on Crystal and Magnetic Properties of $Gd_2Cu_2In$
    Autorzy:
    Gondek, Ł.
    Szytuła, A.
    Kaczorowski, D.
    Szewczyk, A.
    Gutowska, M.
    Tyvanchuk, Yu.
    Kalychak, Ya.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419907.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    75.30.Kz
    75.50.Ee
    Opis:
    Physical properties of $Gd_2Cu_{2 - x}Co_{x}In$ (x = 0.1, 0.2, 0.3) samples are investigated. The paper brings results of X-ray diffraction, magnetometric as well as specific heat studies. It was found that only sample with x = 0.1 exhibits desired crystal structure. Other compositions show existence of impurities due to lack of dissolution Co atoms. For $Gd_2Cu_{1.9}Co_{0.1}In$ sample the Curie temperature of 92.5 K was evidenced. Thus, an enhancement of ferromagnetic correlations with comparison to $Gd_2Cu_2In$ sample was evidenced. It was found that $Gd_2Cu_{1.9}Co_{0.1}In$ sample exhibits magnetocaloric effect within broad temperature range.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 216-219
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Lutetium Co-Doping on the Main Dosimetric Peak of YAP:Mn²⁺ Thermoluminescent Detectors
    Autorzy:
    Zhydachevskyy, Ya.
    Głowacki, M.
    Martynyuk, N.
    Ubizskii, S.
    Berkowski, M.
    Suchocki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030950.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Hx
    Opis:
    An effect of lutetium co-doping on photoluminescent and thermoluminescent properties of the Mn²⁺-doped (Lu-Y)AP crystals (with Lu content from 0 to 20% with respect to Y) grown by the Czochralski technique has been studied. It was found that the maximum of the thermoluminescent peak at 200°C is shifted towards higher temperatures at Lu content more than 5%. At the same time the position of the second thermoluminescent peak near 350°C remains unchanged. The observed changes in the thermoluminescent peak position are discussed in terms of the point defects of the material.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 973-976
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of Co and Cu co-doping ZnO thin films on structural and optical properties
    Autorzy:
    Saoud, Tayeb
    Benramache, Said
    Diha, Abdallah
    Powiązania:
    https://bibliotekanauki.pl/articles/31342694.pdf
    Data publikacji:
    2023
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    ZnO
    thin films
    Co
    Cu
    co-doping
    TCO
    spray pneumatic method
    cienkie warstwy
    współdomieszkowanie
    Opis:
    Using a spray pneumatic technique, cobalt (Co) and copper (Cu) co-doped zinc oxide thin films were effectively deposited on a glass substrate. The goal of this work was to create a semiconductor with good optical and electrical properties by co-doping ZnO thin films with Cu and Co. The ZnO thin films obtained from the Co and Cu co-doping exhibit patterns of x-ray diffraction spectra that suggest they are hexagonal ZnO (wurtzite, JCPDS 36-1451). The thin film elaborated with 2 % Co and 7 % Cu has the lowest value of crystallite size (D = 14.67 nm). The transmission spectra demonstrate that all films have good optical transparency in the visible spectrum, with 7 % Cu achieving the highest transmission. Increasing Cu contents raised the band gap energy. The value at the minimum was 3.31 eV. The optical band gap’s broadening is a significant characteristic of advanced materials and may be useful in applications involving metal oxide nanostructures for visible light gas sensing.
    Źródło:
    Chemistry-Didactics-Ecology-Metrology; 2023, 28, 1-2; 171-178
    2084-4506
    Pojawia się w:
    Chemistry-Didactics-Ecology-Metrology
    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
    Tytuł:
    The influence of fabrication conditions on the physical properties of PLZT:Nd3+ ceramics
    Wpływ warunków otrzymywania na fizyczne właściwości ceramiki PLZT:Nd3+
    Autorzy:
    Płońska, M.
    Pisarski, W.A.
    Wodecka-Duś, B.
    Czekaj, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/353194.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PLZT
    ferroelectric ceramics
    luminescence
    Nd3+co-doping
    ceramika PLZT
    ceramika ferroelektryczna
    luminescencja
    Opis:
    The aim of this work was to study the effect of fabrication conditions and neodymium co-doping on the physical properties of (Pb0.98La0.02)(Zr0.65Ti0.35)0.98O3, known as PLZT:Nd3+ ceramics. All ceramic powders of these materials were synthesized by the conventional mixed oxide method, from the high purity raw materials (>99.9%). The bulk ceramic samples were sintered by the pressure less sintering and the hot-uniaxial pressing techniques. The study gives a detailed account of the relationships between doping and preparing conditions on the dielectric and optical properties of obtained ceramic materials. Optimal conditions of PLZT:Nd3+ preparation as well as Nd3+ activator concentration were determined in relation to the potential opto-electronic applications.
    Celem niniejszej pracy było zbadanie wpływu warunków wytwarzania i zastosowanej domieszki neodymu na właściwości fizyczne ceramiki (Pb0.98La0.02)(Zr0.65Ti0.35)0.98O3, określanej mianem PLZT:Nd3+. Wszystkie proszki przygotowanych składów syntetyzowano metodą konwencjonalną, z tlenków o wysokiej czystości (>99.9%). Próbki ceramiczne zagęszczano techniką swobodnego spiekania i jednoosiowego prasowania na gorąco. Wykonane badania dały szczegółowy opis zależności między stosowaną domieszką oraz przyjętymi warunkami wytwarzania oraz wpływu na dielektryczne i optyczne właściwości otrzyma- nych materiałów ceramicznych. Optymalne warunki przygotowania PLZT:Nd3+, jak również zastosowane stężenia aktywatora Nd3+ zostały określone w odniesieniu do potencjalnych zastosowań optoelektronicznych.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 4; 1365-1369
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Multiple Cation (Al, Si, Ti, Co) Doping on Electrochemical Performance οf $LiMn_2O_4$ Cathode Active Material
    Autorzy:
    Kılıç Dokan, F.
    Şahan, H.
    Veziroğlu, S.
    Akkuş Taş, N.
    Aydın, A.
    Patat, Ş.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399894.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.80.ff
    Opis:
    In order to improve the cycling performance of $LiMn_2O_4$, the spinel phases base and multiple cation doped $LiMn_{1.95}Al_{0.0125}Si_{0.0125}Ti_{0.0125}Co_{0.0125}O_4$, $LiMn_{1.9}Al_{0.025}Si_{0.025}Ti_{0.025}Co_{0.025}O_4$ spinels were synthesized by the glycine-nitrate combustion process. The structures of the products were investigated by X-ray diffraction, scanning electron microscopy and electrochemical tests.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 365-367
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of fluorine and tungsten co-doping on optical, electrical and structural properties of tin (IV) oxide thin films prepared by sol–gel spin coating method
    Autorzy:
    Keskenler, E F
    Turgut, G
    Aydin, S.
    Dogan, S
    Duzgun, B
    Powiązania:
    https://bibliotekanauki.pl/articles/175016.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    tin (IV) oxide (SnO2)
    fluorine (F) and tungsten (W) co-doping
    sol-gel
    Opis:
    Fluorine and tungsten co-doped tin (IV) oxide (WFTO) thin films have been prepared first time by a sol–gel spin coating method. The effect of F and W co-dopant ratio on optical, electrical and structural properties of SnO2 was investigated. It was found that the optical properties of the films were obviously affected by the co-dopant ratio. When the F:W co-dopant ratio increases from 0.25:0.25 to 0.75:0.50, the transmittance in the short wavelengths slightly increases and transmittance edge shifts towards shorter wavelength. With an increase in the co-dopant ratio, the reduction and red shifts in the optical transmittance edge are very obvious at all wavelengths. Transmittance values at 550 nm for the films have varied between 79.64% and 50.20%. The indirect and direct band gap values for WFTO-1, WFTO-2, WFTO-3 and WFTO-4 samples were calculated to be 3.73, 3.79, 3.48, 3.40 eV and 4.03, 4.04, 3.98, 3.97 eV, respectively. The crystal structure of the films has been investigated by X-ray diffraction patterns. It has been observed that WFTO-1 and WFTO-2 samples have (111) preferential orientation corresponding to SnO2 cubic phase. This orientation almost disappears and changes to tetragonal phase (110) orientation for WFTO-3 and WFTO-4. To the best of our knowledge, this is the first cubic structure observation for SnO2 grown by the sol–gel technique. The electrical properties were also changed with co-doping ratio. The best optical, electrical and structural properties were obtained for mole ratio 0.75:0.50 (F:W).
    Źródło:
    Optica Applicata; 2013, 43, 4; 663-677
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Co Doping on Induced Anisotropy and Domain Structure in Magnetic Field Annealed $(Fe_{1-x}Co_x)_{79}Mo_8Cu_1B_{12}$
    Autorzy:
    Kunca, B.
    Marcin, J.
    Švec, P.
    Kováč, J.
    Švec Sr., P.
    Škorvánek, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398273.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.50.Tt
    75.60.Ch
    75.60.Nt
    Opis:
    The effect of heat treatment in applied magnetic field on the induced anisotropy and domain structure of $(Fe_{1-x}Co_x)_{79} Mo_8 Cu_1 B_{12}$ (x=0, 0.2, 0.5) nanocrystalline alloy system was investigated. A heat treatment of Co-doped samples under the application of longitudinal magnetic field resulted in squared hysteresis loops characterized by very low coercive field values. Sheared loops with tunable slope and good field linearity were obtained after annealing in transverse magnetic field. Corresponding domain structure showed uniform character, oriented in the direction parallel or perpendicular to the ribbon axis after longitudinal or transverse magnetic field annealing, respectively. No effect of magnetic field annealing was found in Co-free sample. Correlations between Co-doping, the Curie temperature, and soft magnetic properties after magnetic field annealing are discussed.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 759-761
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ionic conductivity of the CeO2-Gd2O3-SrO system
    Przewodnictwo jonowe w układzie CeO2-Gd2O3-SrO
    Autorzy:
    Dudek, M.
    Mosiałek, M.
    Mordarski, G.
    Socha, R.
    Rapacz-Kmita, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/352955.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    elektrolity stałe tlenku ceru
    roztwór stały
    stałotlenkowe ogniwo paliwowe
    solid oxide electrolytes
    ceria-based solid solutions
    co-doping
    solid oxide fuel cell
    Opis:
    The Pechini method was used to synthesize nanopowders of CeO2-based solid solutions with the formula Ce0.8-xGd0.2SrxO2- for 0
    Jednofazowe proszki roztworów stałych Ce0:8-xGd0:2SrxO2- dla 0
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 1249-1255
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Doping Effects of Co, Ni, and Cu in $FeTe_{0.65}Se_{0.35}$ Single Crystals
    Autorzy:
    Bezusyy, V.
    Gawryluk, D.
    Berkowski, M.
    Cieplak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431291.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.F-
    74.25.Op
    74.62.Dh
    74.70.Xa
    Opis:
    The resistivity, magnetoresistance, and magnetic susceptibility are measured in single crystals of $FeTe_{0.65}Se_{0.35}$ with Cu, Ni, and Co substitutions for Fe. The crystals are grown by Bridgman's method. The resistivity measurements show that superconductivity disappears with the rate which correlates with the nominal valence of the impurity. From magnetoresistance we evaluate doping effect on the basic superconducting parameters, such as upper critical field and coherence length. We find indications that doping leads to two component superconducting behavior, possibly because of local charge depression around impurities.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 816-819
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Mn doping on magnetic and structural properties of Co₂FeSi Heusler alloy
    Autorzy:
    Galdun, L.
    Ryba, T.
    Kováč, J.
    Prida, V.
    Hernando, B.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054765.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    72.20.Lp
    Opis:
    We have studied the effect of Mn doping on structural and magnetic properties of Co₂FeSi Heusler alloy. Co₂FeSi, Co₂Mn_{0.25}Fe_{0.75}Si and Co₂Mn_{0.5}Fe_{0.5}Si alloys were prepared by melt spinning technique which offers fast and simple production of large amount of materials in a single production step. The rapid quenching method provides an opportunity to prepare Heusler alloys with highly ordered L2₁ structure confirmed by X-ray analysis in all the samples. Magnetic measurements revealed high Curie temperatures (>1000 K) and well defined easy magnetization plane parallel with the ribbon plane. Those attributes predispose given samples for applications in spintronics.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 866-868
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and physicochemical characteristics of titanium dioxide doped with selected metals
    Autorzy:
    Siwinska-Stefanska, K.
    Paukszta, D.
    Piasecki, A.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/951839.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    titanium dioxide
    sol-gel method
    doping
    TiO2 surface modification
    Fe and Co dopant
    Opis:
    The paper details with of the preparation and physicochemical characterisation of nano- and microstructured TiO2 doped with Fe and Co produced by the sol-gel method using titanium alkoxide as the precursor of titania as well as iron or cobalt nitrates as dopant sources. Fe and Co doped TiO2 materials were successfully prepared with two different methods. The effect of the dopant type on the synthesis of TiO2 powders was investigated. The physicochemical properties of the studied samples were determined. The characterisation included determination of the dispersion and morphology of the systems (particle size distribution, SEM images), characteristics of porous structure (BET isotherms), crystalline structure (XRD), surface composition (EDS), as well as thermal stability (TG/DTA).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 265-276
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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