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Journal of Alloys and Compounds
Elsevier Science S.A.
Journal of Alloys and Compounds

Elsevier Science S.A.

0925-8388

Journal of Alloys and Compounds/Journal Journal of Alloys and CompoundsSCIISTPEI
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    Customization of novel double-perovskite (Ca,Sr)2InNbO6:Mn4+ red-emitting phosphors for luminescence lifetime thermometers with good relative sensing sensitivity

    Hua Y.Wang T.Yu J.S.Li H....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.Luminescent thermometry with some outstanding advantages of quick response, large measurement range, and good sensing sensitivity has been widely investigated and suggested for practical applications as a kind of potential technique to detect real temperature. Herein, novel double-perovskite (Ca,Sr)2InNbO6:Mn4+ red-emitting phosphors were prepared and further designed for the luminescence lifetime thermometers based on the temperature-dependent decay curves. At first, the crystal structure, morphology, and some luminescent properties (i.e., photoluminescence (PL) emission spectrum, concentration quenching mechanism, crystal field strength, chromaticity coordinate, color purity, quantum yield, thermal stability, and decay curve) of the Ca2InNbO6:Mn4+ and Sr2InNbO6:Mn4+ phosphors were systematically analyzed and compared. Afterward, it revealed that the PL properties of Ca2InNbO6:Mn4+ phosphors were excellent compared to Sr2InNbO6:Mn4+ phosphors owing to the stronger crystal field strength of Mn4+ ion. Most interestingly, the relative sensing sensitivities of the Ca2InNbO6:Mn4+ and Sr2InNbO6:Mn4+ phosphors were estimated as high as 3.30 % and 4.25 % K?1 with the low-temperature uncertainty of 0.11 and 0.09 K, respectively, indicating that the resultant novel double-perovskite (Ca,Sr)2InNbO6:Mn4+ phosphors could be proposed for luminescence lifetime thermometers with high sensing sensitivity.
      原文链接:
    • NSTL
    • Elsevier

    A Mg-6Y-3Zn-1Al Mg HPDC alloy having high thermal stability: Study of grain growth kinetics

    Yu X.Bai Y.Ye B.Wang L....
    10页
    查看更多>>摘要：? 2022 Elsevier B.V.The thermal stability and grain growth kinetics of a high-pressure die casting (HPDC) Mg-6Y–3Zn-1Al (WZA631, wt%) alloy with long-period stacking ordered (LPSO) phase is studied by subsequent annealing at different temperatures and time. The grain size of the as-cast and annealed samples is determined using the linear intercept method. It is found that grain size of WZA631 alloy hardly changes up to 450 °C, indicating the microstructure is thermally stable. The grain growth kinetics of WZA631 alloy between 450 °C and 550 °C is well described by the kinetic equation, Dn?D0n=kt. The grain growth exponent varies with temperature, ranging from n = 4.98 at 450 °C to n = 1.45 at 550 °C. The values of activation energy Eg are approximately 122.5 kJ/mol and 139.1 kJ/mol, respectively, for annealing temperature below and above 500 °C, which identifies the bulk diffusion to be the principal grain growth mechanism in the studied temperature range. The growth rate constant k at 450–500 °C is around 2–4 orders lower than other typical Mg alloys, suggesting the excellent thermal stability below 500 °C. The grain coarsening temperature TGC and softening temperature TS are all around 500 °C, implying the critical temperature related to the thermal stability of WZA631 alloy is ~500 °C. The microstructure evolution shows that LPSO network structure is a predominant factor inhibiting the grain growth of HPDC WZA631 alloy, and the dissolution of LPSO results in the variation of grain growth exponent.
      原文链接:
    • NSTL

    Performance analysis of lead-free halide double perovskite-based photovoltaic devices for solar cell conception

    Amraoui S.Feraoun A.Kerouad M.
    7页
    查看更多>>摘要：? 2022 Elsevier B.V.The conception and modeling of a photovoltaic cell are done by combining the density functional theory (DFT) and solar cell capacitance simulator (SCAPS). The search for new lead-free halide semiconductor perovskite materials with an appropriate band gap, which can be used as good absorbers of solar radiation in the studied photovoltaic cell, is realized by substituting a percentage of sodium (Na) with potassium (K) and sulphur (S) in the double perovskite Cs2NaCrCl6. The study also focuses on the choice of the best materials for the electron transport layer (ETL) and the hole transport one (HTL) as well as the thickness of the perovskite semiconductor materials Cs2Na1?xXxCrCl6 (X = S and K). The results reveal that Cu2O and WS2 are suitable materials for HTL and ETL layers, respectively. The optimal thickness of the perovskite semiconductor is equal to 2μm. Under optimized conditions, the photovoltaic device power conversion efficiency (η) equals 15.01 % and 20.01 % by using Cs2Na0.5K0.5CrCl6 with Eg = 1.8eV and Cs2NaCrCl6 with Eg = 1.6eV as active layer, respectively. Therefore, the obtained photovoltaic cell model is (Cu2O/Cs2NaCrCl6/WS2/FTO), with an efficiency of η = 20.01 %.
      原文链接:
    • NSTL
    • Elsevier

    Synthesis chemical methods for deposition of ZnO, CdO and CdZnO thin films to facilitate further research

    Amudhavalli B.Prasath M.Mariappan R.
    61页
    查看更多>>摘要：? 2022 Elsevier B.V.Thin film materials have been used in semiconductor devices, wireless communications, telecommunications, integrated circuits, rectifiers, transistors, solar cells, lightemitting diodes, photoconductors and light crystal displays, lithography, micro- electromechanical systems (MEMS) and multifunctional emerging coatings, as well as other emerging cutting technologies. The ZnO, CdO and CdZnO thin films were deposited by chemical routes such as chemical bath deposition, spray pyrolysis, Sol-Gel spin coating, electrodeposition, SILAR, chemical vapour deposition, atomic layer deposition, and pulsed vapour deposition are discussed. Furthermore, the ZnO, CdO and CdZnO thin films depend on various preparative parameters such as the molarity, pH of the solution, deposition time, annealing temperature, annealing time, thickness, substrate used and pressure etc are also discussed.
      原文链接:
    • NSTL
    • Elsevier

    XPS analysis and structural characterization of CZTS thin films deposited by one-step thermal evaporation

    Ahmadi S.Khemiri N.Kanzari M.Cantarero A....
    11页
    查看更多>>摘要：? 2022 Elsevier B.V.Earth abundant and non-toxic CZTS films were grown by one-step thermal evaporation from as prepared and calcined powders followed by a sulfurization process at 400 °C.400 °C. X-ray diffraction and Raman studies have shown polycrystalline quality of the samples with kesterite structure, which are preferentially oriented along the (112) plane. The structural parameters of all CZTS samples were estimated before and after sulfurization. The structural properties indicate an enhancement of crystallinity after the sulfurization process. Scanning electron microscopy demonstrates significant morphological changes in the films after the sulfurization. Compositional analysis made by energy dispersive spectroscopy shows that the composition of the films moves towards the theoretical 2:1:1:4 stoichiometry due to sulfurization process. Finally, we have investigated the oxidation state of all the elements in CZTS after sulfurization by using XPS. We found that all the films were formed with the valence state of Cu+, Zn2+, Sn4+ and S2?.
      原文链接:
    • NSTL
    • Elsevier

    Flexible cesium lead halide CsPbX3@SiO2 (X = Cl, Br, I and their mixtures) perovskite nanocrystal films

    Wang C.Zhang C.Wang F.Chen J....
    10页
    查看更多>>摘要：? 2022 Elsevier B.V.A centrifugally casting process was developed to prepare inorganic cesium lead halide CsPbX3 @SiO2 (X = Cl, Br, I and their mixtures) perovskite nanocrystal (PNC) films with high photoluminescence performance. By this costless solution-processing method, the obtained CsPbX3 @SiO2 nanocrystal (NC) films exhibit the strong emission covering the whole visible light range with high photoluminescence quantum yields (PLQYs) of 94.0 %, 33.7 % and 10.9 % for the green, blue and red emission, respectively. By encapsulating CsPbX3 NCs with silica, the CsPbX3 @SiO2 NC films achieve remarkably enhanced stability against the ultraviolet (UV) irradiation, the thermal shock and the moist environment, especially for the CsPbBr3 @SiO2 NC films. Through using the flexible substrates such as polyethylene-terephthalate (PET), the CsPbX3 @SiO2 NC films show the excellent scalable and bendable capability. In addition, the LED devices assembled with the CsPbX3 @SiO2 NC films display a broader gamut and a highest color rendering index of 93.4. The achievement of the flexible CsPbX3 @SiO2 NC films with high photoluminescence performance and better stability by the centrifugal method used here, opens a gate for practical applications of PNCs in the flexible luminescence and display devices.
      原文链接:
    • NSTL
    • Elsevier

    Fabrication of 1D/2D Y-doped CeO2/ZnIn2S4 S-scheme photocatalyst for enhanced photocatalytic H2 evolution

    Lu X.Quan L.Hou H.Liu Z....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.The construction of well-defined heterojunction structure is considered to be an effective way to improve the efficiency of photocatalytic hydrogen evolution. One-dimensional(1D) Y-doped CeO2 nanorods/two-dimensional (2D) ZnIn2S4 S-scheme heterojunction composite was prepared via hydrothermal and solvothermal method. When the mass ratio of Y-doped CeO2 to ZnIn2S4 is 10 %, the composite exhibits the highest hydrogen evolution rate of 857 μmol·g?1·h?1 under visible light irradiation, which is obviously better than pure Y-doped CeO2 and ZnIn2S4 respectively. Meanwhile, transient photocurrent spectra, photoluminescence (PL) spectra and electrochemical impedance spectroscopy（EIS）measurement indicate that the separation efficiency of photogenerated electrons and holes in the composites is higher. Finally, the S-scheme heterojunction mechanism is determined through UV–vis diffuse reflectance spectra (DRS), VB-XPS spectrum, electron spin resonance (ESR) spectra, ultraviolet photoelectron spectroscopy (UPS) spectra and energy band structure analysis. This study may provide an effective S-scheme heterojunction photocatalysts for photocatalytic hydrogen evolution applications.
      原文链接:
    • NSTL
    • Elsevier

    Surface crystallization enhanced upconversion luminescence in NaGdF4:Yb,Er@NaYF4 core/shell nanocrystals

    Liu Y.Wu X.Wu S.Dong B....
    8页
    查看更多>>摘要：? 2022 Elsevier B.V.Coating upconversion nanocrystals with an inert shell for removing surface defects is confirmed to be an efficient way for remarkably enhancing upconversion luminescence. However, it is not clear whether surface atomic structures on the outer inert shell affect upconversion luminescence of active cores. Here, we improved the surface crystallinity of NaGdF4:Yb,Er@NaYF4 active-core/inert-shell nanocrystals using ultrasonic oscillation. It was observed that surface crystallization of the inert shell could lead to an obvious enhancement in upconversion luminescence. The improved surface crystallinity has no obvious influence on the electronic transition in upconversion luminescence processes, but decrease the scattering and absorption to excitation and emission photons. This result clearly indicates that surface crystallization of the inert shell is a powerful route for further enhancing upconversion luminescence besides of the concept of core/shell structure.
      原文链接:
    • NSTL
    • Elsevier

    Influence of oxygen vacancies on the structure and magnetic properties of high entropy (Co,Cr,Fe,Mn,Ni)3O4 ceramics

    Sun X.Zeng X.He X.Fang W....
    10页
    查看更多>>摘要：? 2022 Elsevier B.V.This research revealed the influence of oxygen vacancies on the structure and magnetic properties of high entropy (Co,Cr,Fe,Mn,Ni)3O4 ceramics. High entropy (Co,Cr,Fe,Mn,Ni)3O4 and (Co,Cr,Fe,Mn,Ni)3O4?n ceramics with a single-phase spinel structure was synthesized by surfactant-assisted hydrothermal technology combined with a heat treatment method. X-ray diffraction Rietveld analysis showed that the lattice constant of (Co,Cr,Fe,Mn,Ni)3O4 and (Co,Cr,Fe,Mn,Ni)3O4?n were 8.346 ? and 8.327 ?, whereas the lattice distortion were 0.314–0.007, respectively. Magnetic studies indicate that all synthesized samples exhibit typical ferrimagnetism at 5–300 K. Compared with (Co,Cr,Fe,Mn,Ni)3O4, the Hc of (Co,Cr,Fe,Mn,Ni)3O4?n increased from 7.99·10 Oe to 9.03·10 Oe, the Ms increased from 4.38 emu·g-1 to 6.59 emu·g-1 at room temperature. The theory calculations reveal that the 3d TM atoms are origin of the magnetism. And compared with (Co,Cr,Fe,Mn,Ni)3O4, the spin density of metal atoms of (Co,Cr,Fe,Mn,Ni)3O4?n increases and the direction change. Our observation and theoretical calculations serve as a link between the defect, structure, and magnetic properties, providing a new sight into understanding the structural origin of the changes in magnetic properties of high entropy ceramics.
      原文链接:
    • NSTL
    • Elsevier

    A three-dimensionally hierarchical interconnected silicon-based composite for long-cycle-life anodes towards advanced Li-ion batteries

    Bai X.Zhang H.Lin J.
    10页
    查看更多>>摘要：? 2022 Elsevier B.V.Although the utilization of conducting polymers in silicon anodes as both a conductive agent and binder is extremely attractive, key challenges exist in maintaining constant electric connectivity with silicon, especially during long-term cycling. In addition to the in-situ formation of polyaniline (PANI) encapsulating silicon nanoparticles (SiNPs) inside, herein PANI is also used as a three-dimensional (3D) bridge to interconnect the outside carbon nanotubes functionalized with carboxyl groups (CNFs-COOH) via electrostatic attraction and π-π conjugation. Further improvements in Li-ion diffusion kinetics and cycling properties can be achieved by low-temperature sintering the double-protected SiNPs without destruction of the 3D PANI conductive skeleton. Such a novel composite (i.e. Si@C/PANI-CNT) with a 3D hierarchically interconnected architecture containing 52 wt% SiNPs delivers a high discharge capacity of 879 mAh g?1 at 0.5 A g?1 with a capacity loss of 0.084% per cycle after 500 cycles. Increasing the current density to 1 A g?1, no big change in the 500th discharge capacity (817 mAh g?1) is found and the specific capacity still stabilizes around 605 mAh g?1 over 1000 cycles.
      原文链接:
    • NSTL