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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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    Impact of amorphous SiO2 as shell material on superparamagnetic Fe3O4 nanoparticles and investigation of temperature and frequency dependent dielectric properties

    Divya S.Lims S.C.Jose M.Manivannan M....
    11页
    查看更多>>摘要：? 2022 Elsevier B.V.In this work, Fe3O4 nanoparticles and amorphous silica coated Fe3O4@SiO2 nanocomposites synthesized using solvothermal method and modified St?ber method are reported. Powder XRD analysis, FTIR spectroscopic technique and X-ray photoelectron spectroscopy analyzeswere employed to confirm the structure and formation of Fe3O4 nanoparticles and Fe3O4 @SiO2 core shell structured nanocomposites. The structural details elucidated from TEM images and SAED patterns are very much in agreement with the XRD results and confirm the formation of Fe3O4@SiO2 core shell structured nanocomposites. VSM analysis confirms super paramagnetic features having soft magnetic property in Fe3O4@SiO2 albeit with reduction in saturation magnetization. The dielectric behavior was studied at different temperatures in the frequency range between 1 Hz and 1 MHz in the temperature range 373 K to 723 K in steps of 50 K. The modulus spectrum formalism reveals temperature dependent hopping type of mechanism for charge transport and the impedance spectra reveals the contribution of grain effect on the electrical properties. Further, the analysis of dielectric data indicates that the Fe3O4@SiO2 displays positive temperature coefficient of resistance type behavior and the frequency dependent ac conductivity obeys the well-known Jonscher's power law.
      原文链接:
    • NSTL
    • Elsevier

    Nanoarchitectonics of S-scheme 0D/2D SbVO4/g-C3N4 photocatalyst for enhanced pollution degradation and H2 generation

    Fan J.Liu E.Yu Q.Hu X....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.In this work, we successfully explored the possibility of using SbVO4 nanoparticles to construct photocatalyst. In detail, 0D/2D SbVO4/g-C3N4 was constructed by a simple physical mixing strategy. The SbVO4/g-C3N4 composite exhibits the admire photocatalytic performance including H2 generation from water, and the photocatalytic degradation activity of RhB, MB and ceftriaxone sodium. Based on ESR radical detection and photoelectrochemical tests, the result can be well concluded that an efficient S-scheme heterojunction is formed between SbVO4 and g-C3N4. The charge separation of the SbVO4/g-C3N4 composite has been dramatically improved in comparison to their monomers due to the built-in electric field, band bending and electrostatic attraction, and the charge carriers with high redox activity, resulting in enhanced activity.
      原文链接:
    • NSTL
    • Elsevier

    Enhanced electrochemical performance of flexible asymmetric supercapacitor based on novel nanostructured activated fullerene anchored zinc cobaltite

    Swain G.Parida K.Mohanty R.
    13页
    查看更多>>摘要：? 2022 Elsevier B.V.The rational design and development of nanostructured materials having unique structural and superior electrochemical activity is urgently required for achieving ultra-high energy storage performance. In this regard, activated fullerene decorated over zinc cobaltite (A-C60-ZCO) has been synthesized and its performance evaluation was displayed towards supercapacitor application. As synthesized nanocomposite shows the enhanced specific capacitance of 593.2 F/g at a scan rate of 1 mV/S and retained the capacitance of 83.7% till 5000 cycles at a high current density of 8 A/g. The enhanced performance can be attributed to the hybrid nature of the prepared material, where A-C60 enhances the stability and conductivity and the ZCO enhances the charge storage owing to its pseudo capacitive nature. The incorporation of A-C60 immensely improved the specific capacitance and cyclic stability of the nanocomposite by enhancing hydrophilicity, conductivity, ion/electron transport ability, redox active functional groups and electroactive sites. Furthermore, the constructed flexible asymmetric supercapacitor device provided an energy density of 36.43 Wh/kg at a power density of 1681.47 W/kg, with a superior cycling performance of 91.06% capacitance retention after 5000 cycles at 6 A/g. Owing to the impressive electrochemical performance A-C60-ZCO can be considered as the potential candidate for supercapacitor application.
      原文链接:
    • NSTL
    • Elsevier

    Microstructure evolution and dynamic recrystallisation behaviour in hot deformation of Haynes 214 superalloy

    Zhu X.Sun W.Zhu C.Liu J....
    12页
    查看更多>>摘要：? 2022 Elsevier B.V.The microstructure evolution and dynamic recrystallisation (DRX) behaviour of Haynes 214 superalloy were investigated in the deformation temperature range of 900 ~ 1180 ℃ and strain rate range of 0.1 ~ 10 s?1 during isothermal compression tests. According to the true stress-strain curves that were obtained from the tests, it was found that temperature and strain rate significantly influence the hot deformation behaviour of Haynes 214 alloy. The fraction and grain size of the dynamic recrystallisation both increase as deformation temperature increases. Fine and uniform DRX grains are obtained at low and high strain rates, whereas at 1 s?1, DRX grain size and fraction decrease. In addition, both continuous dynamic recrystallisation (CDRX) and discontinuous dynamic recrystallisation (DDRX) occur during hot deformation, both being affected by strain rate and deformation temperature. At the same time, the fraction of ∑3 n (n = 1, 2, 3) twin boundary increases as temperature increases and is higher at a lower strain rate (0.1 s?1) and higher strain rate (5, 10 s?1), but lower at the intermediate strain rate of 1 s?1.
      原文链接:
    • NSTL
    • Elsevier

    Double-shelled CeO2 coupled CdZnS nanoparticles as an efficient heterojunction visible light photocatalyst for hydrogen evolution

    Xie Z.Han G.Diao G.Bai J....
    8页
    查看更多>>摘要：? 2022 Elsevier B.V.Designing of novel semiconductor photocatalysts toward high-efficient catalytic H2 generation has played a potential role in developing sustainable energy. Here, nanostructured CeO2/CdZnS/ZnO composite material has been synthesized through simple hydrothermal process. The present photocatalyst exhibits high photocatalytic activity for H2 generation under visible light irradiation (λ > 420 nm). It can be possibly explained: First, the ZnO layer formed on double-shelled CeO2 hollow spheres (D-CeO2) by the priority adsorption of Zn2+ exhibits both efficient hole consumption and photo-corrosion inhibition. Second, superior charge separation and charge transfer efficiency originates from the Z-scheme CeO2/CdZnS heterojunction.
      原文链接:
    • NSTL

    Transport properties and phase diagrams of FeSe1?xSx (0 ≤ x ≤ 1) single crystals

    Liu W.H.Yi X.L.Li W.C.Zhao H.J....
    7页
    查看更多>>摘要：? 2022 Elsevier B.V.Based on the high quality FeSe1?xSx (0 ≤ x ≤ 1) single crystals synthesized via a hydrothermal method, we carried out systematic measurement of the normal state magnetoresistance and Hall effect. Through the maximum entropy mobility spectrum analysis (MEMSA), we investigate the evolution of mobility spectrum, which reflects the multi-band structures for different doping content x and temperature T. The relationships between Tc and carrier properties calculated by MEMSA, as well as bond angles and anion height calculated by first-principle method are investigated. Nonlinear to linear transition of Hall resistivity(ρxy(B)) is mainly attributed to the decreasing mobilities and merging of mobility peaks with the reductive x or increasing T. The relationship between Tc and carrier density n show weak interaction for the orthogonal phases when x ≤ 0.2, but nearly positive correlation for the tetragonal phases when x > 0.2. Bond angle as well as the Se/S anion height change almost linearly with x within the tetragonal phases, and the V-shaped relationships with Tc indicate that structural factors play a key role in the regulation of superconductivity. Our researches are helpful for understanding the multi-band and complex phase diagram of iron-based superconductors.
      原文链接:
    • NSTL
    • Elsevier

    Surface characteristics and microstructure evolution of a nickel-base single crystal superalloy treated by ultrasonic shot peening

    Li Y.Shang X.Zhai M.Yu L....
    16页
    查看更多>>摘要：? 2022 Elsevier B.V.The surface characteristics and microstructure of a [100]-oriented single crystal superalloy subjected to ultrasonic shot peening (USP) were investigated as a function of peening duration. The obtained results show that USP significantly increases the surface microhardness of the single crystal superalloy, reaching up to 650 HV. As peening duration increases, surface roughness and microhardness increase at first and then remain stable. Meanwhile, new components and orientations are formed on the treated surface. The depths of the cold work layer and slip band reach saturation with sufficient peening durations. However, the microstructure beneath the surface continues to evolve with increasing peening time. Excessive peening duration will facilitate the formation of curved slip bands, distinct misorientation and subgrains, which may damage the coherent strengthening of γ/γ′ structures and result in a lower hardness value in the depth direction. Combining the effects of surface alloying, strain-induced diffusion and strain-induced dissolution, four layers (i.e., the nanocrystalline α-Fe layer, Fe, Ti, Ni interdiffusion layer, nickel-based γ′-free layer and deformed γ/γ′ layer) are formed on a single crystal substrate with sufficient USP durations. For single crystal superalloys, there exists an optimal processing duration to achieve the balance between surface hardening and coherent strengthening of γ/γ′ structures.
      原文链接:
    • NSTL
    • Elsevier

    Catalyze hydrolysis reaction for hydrogen generation by Mg/Mg2Ca nanolamellar structure in Mg–Ca alloys

    Sutou Y.Uchiyama T.Ando D.
    13页
    查看更多>>摘要：? 2022 The Author(s)The hydrogen generating characteristics of Mg–Ca alloys with Mg/Mg2Ca nanolamellar structures in the hydrolysis reaction with artificial seawater—a 3.5-wt% NaCl aqueous solution—were investigated for a new hydrogen supply source application. The concept of this study was to fabricate a complete hydrolysis reaction alloy using nanolamellar structure of Mg and Mg2Ca having an electrochemically less noble product than Mg. The hydrolysis reaction properties of Mg-10Ca, Mg-15Ca, Mg-16.2Ca, Mg-20Ca, and Mg2Ca were compared with respect to microstructure, which is the volume fraction of the primary phase and its nanolamellar width, and reaction temperatures at 10 °C, 20 °C, 30 °C, 40 °C, 50 °C, and 60 °C. Mg-16.2Ca and Mg-20Ca reacted completely even at room temperature and became white powders comprising Mg(OH)2, Ca(OH)2, and CaCO3 after 9–14 days without changing the solvent. The hydrolysis reaction rates of the Mg–Ca alloys in the temperature range of 10–40 °C were fast in the order of Mg-16.2Ca ≥ Mg-20Ca ≥ Mg-10Ca ≥ Mg-15Ca. From the results of the hydrolysis reaction rate dependency on temperature, the activation energies of Mg-10Ca, Mg-15Ca, Mg-16.2Ca, Mg-20Ca, and Mg2Ca were estimated to be 41.27, 43.39, 22.07, 15.46, and 29.27 kJ mol?1, respectively. This study revealed that the eutectic structure with several nanogalvanic cells of Mg/Mg2Ca in the alloys accelerated the hydrolysis reaction and completely reacted with artificial seawater for hydrogen generation.
      原文链接:
    • NSTL
    • Elsevier

    Composition and property optimization of rare-earth-free Mn-Al-C magnet by phase stability and magnetic behavior analysis

    Kim S.-G.Kim S.Lee H.-S.Lee W....
    10页
    查看更多>>摘要：? 2022 Elsevier B.V.Mn-Al-C system offers a possibility of rare-earth-free permanent magnets with the reduced temperature-dependent deterioration of magnetic properties. The Mn-Al-C alloy composition and magnetic properties have been optimized via calculations of electronic structures and phase stability of L10-ordered ferromagnetic τ-phase (Mn0.5Al0.5)100?xCx. The WIEN2k program package, Vienna Ab-initio simulation package (VASP), and Alloy Theoretic Automated Toolkit (ATAT) were used to calculate and identify the optimal carbon content for the most stable τ-phase of the L10-structured Mn-Al-C. We used the Brillouin function and Callen-Callen semiempirical relation to obtain the saturation magnetization and magnetocrystalline anisotropy constant at elevated temperatures. It was found that a carbon content of 2.33 at% gives the most stable τ-phase L10 (Mn0.5Al0.5)100?xCx that has the lowest formation energy and highest saturation magnetization among the studied carbon contents (x = 0–3.03 at%). The magnetocrystalline anisotropy constant at 0 K increases with increasing the carbon content. Therefore, the carbon-doped Mn-Al becomes magnetically harder than the pure Mn50Al50. However, the anisotropy constant decreases at 300 K as the carbon content increases. The Curie temperature decreases to 590 K at x = 2.33 from 685 K at x = 0.0. The estimated saturation magnetization was approximately 130 emu/g at 300 K, leading to 18 MGOe under Bs = Br and Hci> Br/2. Therefore, it is highly probable that Mn-Al-C potentially fills the gap between 10 and 30 MGOe magnets. The results in this study quantify and explain the reason for widely studying the approximately 2 at% carbon-doped Mn-Al systems.
      原文链接:
    • NSTL
    • Elsevier

    Synchronous enhancement of responsivity, response time and, spectral range in solution processed CdS photodetector upon modification with PEDOT:PSS

    Reddy B K.S.Borse P.H.Veeralingam S.Badhulika S....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.Solution processed photodetectors with high responsivities and simple fabrication schemes are high on demand for variety of emerging opto-electronic applications. However, these devices suffer from sluggish response and recovery times. In this work, we demonstrate the simultaneous enhancement of the responsivity, response time and spectral range of detection in a solution-processed device based on organic/inorganic hybrid junction. A solution-processed flexible CdS photodetector is fabricated using a facile and economical chemical bath deposition technique. The fabricated pristine-CdS device exhibits responsivity and response time of 50 mA/W and 5.4 s. The resultant device exhibits enhanced responsivity and response time of around 740 mA/W and 0.6 s, respectively, upon modification with the PEDOT:PSS conducting polymer. These values of PEDOT-modified device are one order larger than pristine-CdS detector. Further, PEDOT:PSS modification also extends the responsivity of the device from UV-Vis to NIR spectra. NIR responsivity in the hybrid device, is imputed to the photothermal property of the PEDOT:PSS layer. Thus, the overall device spectral response is accredited to the simultaneous existence of photoelectric and photo-thermal phenomena. The observed responsivity and faster response time is ascribed primarily to the built-in potential at interface of CdS-PEDOT:PSS, which not only facilitates efficient separation of photo carriers but also leads to a reduction in the recombination of excitons. Given the simple approach and excellent enhancement in the device performance, the idea demonstrated here could be useful to design high performance opto-electronic device based on solution-processed techniques.
      原文链接:
    • NSTL
    • Elsevier