首页期刊导航|Journal of Alloys and Compounds
期刊信息/Journal information
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
正式出版
收录年代

    Unveiling the role of Y content in glass-forming ability and soft magnetic properties of Co-Y-B metallic glasses by experiment and ab initio molecular dynamics simulations

    Ma S.Ran Y.Liang X.Jiang L....
    11页
    查看更多>>摘要：The effects of Y content on glass-forming ability (GFA) and soft magnetic properties of Co75-xYxB25 (x = 0, 3.5, 5) metallic glasses (MGs) were investigated by experiment and ab initio molecular dynamics (AIMD) simulations, and the relationship between local atomic structures and properties was discussed. The GFA and magnetic softness of Co75B25 alloy are improved by 3.5 at.% Y addition in our experiment. By calculating the local atomic structures (pair distribution function, coordination numbers, chemical short-range order, Voronoi polyhedron, structure factor, and the ratio of voids), dynamic behavior, electronic structure, magnetic moment, and magnetic anisotropy energy (MAE), we have found that the local atomic structures of Co-Y-B MGs are dominated by the B-centered prism units, and Y plays a vital role in the formation of the densely packed structures. In particular, the strongest chemical affinity of B-B, Co-Y, and B-Y pairs in Co71.5Y3.5B25 alloy is the critical factor for enhancing GFA and magnetic softness, which improves the degree of atomic packing in the first shell, the viscosity of supercooling melts, the stability of the local atomic structures, and reduces the MAE of the system. However, the excessive addition of Y (5 at.%) leads to a reduction of the GFA and magnetic softness, which may contribute to the highest fraction of deformed body-centered cubic (bcc) structures and the largest size of the medium-range order (MRO) structure in Co70Y5B25 alloy. This study shows a valuable perspective to understand the correlation between local atomic structures and properties of Co-based MGs, and also provides ideas for designing high-performance soft-magnetic MGs.
      原文链接:
    • NSTL

    Modification of Cu-deficient CaCu2.8Ti4O12 ceramics via Mg2+ substitution at Cu sites for improved dielectric properties and thermal stability

    Putjuso S.Putjuso T.Nijpanich S.Swatsitang E....
    13页
    查看更多>>摘要：Mg2+ substitution at the Cu sites of Cu-deficient CaCu2.8-xMgxTi4O12 (x = 0.00, 0.05, and 0.10) ceramics was accomplished using a polymer pyrolysis technique. The nonlinear and dielectric properties of all ceramics under various sintering temperatures were investigated. Very low tanδ ～ 0.011–0.030 and giant ε′ ～ 4406–13,521 were obtained in these ceramics. Surprisingly, excellent thermal stability, where ε′ remained within± 15% and is adequate for X8R capacitors, is obtained in CaCu2.75Mg0.05Ti4O12 and CaCu2.7Mg0.1Ti4O12 ceramics sintered at 1100 °C for 8 h. Additionally, the nonlinear J-E properties were improved compared to an unmodified sample. Interestingly, a nonlinear coefficient (α) of ～ 58.05 in the CaCu2.75Mg0.05Ti4O12 ceramic sintered at 1100 °C for 8 h is acceptable for varistor applications. Improvement of nonlinear and dielectric properties arise from the electrical interface responses altered by Mg2+ substitution. The ceramics were characterized using XRD, TEM and FE-SEM techniques to investigate their crystal structure and microstructure. EDXS results confirmed the coexistence of TiO2 and CaTiO3 phases in all ceramics. It was suggested that the enhancement of grain boundary resistance (Rgb) with simultaneously improved electrical and nonlinear J-E behaviors caused by the alternation of electrical interface responses at GBs. XPS measurements of these ceramics presented Cu3+/Cu2+/Cu+ ratios that indicate the semiconducting properties of grains.
      原文链接:
    • NSTL
    • Elsevier

    Electronic manifestation of a disorder mediated metal-insulator transition in epitaxial SrRuO3 thin film

    Bagri A.Sahoo S.Choudhary R.J.Phase D.M....
    9页
    查看更多>>摘要：Herein, the electronic, magnetic, and transport properties of an oxygen-deficient epitaxial SrRuO3 (SRO) thin film have been investigated. The oxygen vacancies (VO) in the SRO thin-film transform a fraction of Ru4+ ions into Ru3+, resulting in an enhancement of the unit cell volume. Due to the elongated lattice parameters, the electronic bandwidth decreases and gives rise to the enhanced correlation strength. Further, distinctive effects of VO are seen in the temperature-dependent resistivity behavior [ρ(T)]. At low temperatures, the SRO thin film exhibits a resistivity minima near 48 K along with the ferromagnetic to paramagnetic transition (TC ~150 K). The resistivity upturn at low temperatures is analyzed using quantum correction in the conductivity and it is found that the weak localization prevails over renormalized electron-electron interactions in the low-temperature resistivity upturn behavior of oxygen-deficient (VO) SRO thin film.
      原文链接:
    • NSTL
    • Elsevier

    Heterogeneous microstructure enables a synergy of strength, ductility and electrical conductivity in copper alloys

    Jie X.Mai Y.Song H.Mai J....
    7页
    查看更多>>摘要：Copper alloys that simultaneously possess excellent electrical conductivity, high strength and reasonable ductility are increasingly needed in aerospace, transportation and electronics industries. Unfortunately, these properties are usually mutually exclusive. Here, a strategy basing on constructing heterogeneous microstructures is proposed to overcome the above trade-off. Heterostructured Cu-Cr-Zr alloys, with micrometer-scale pure copper grains embedded inside a matrix of ultrafine copper grains with nanoscale precipitates are prepared via powder metallurgy. They show a high ultimate tensile strength of 458 MPa, which is higher than the prediction basing on rule of mixtures, meanwhile, retain a considerable ductility of 11% uniform elongation and an excellent electrical conductivity of 83.15% IACS. We further carried out loading-unloading-reloading tests and detailed microstructure characterizations to reveal the strain hardening mechanism induced by such heterogeneous microstructure. Our strategy indicates a promising route to achieve remarkable strength-conductivity-ductility synergy for copper alloys.
      原文链接:
    • NSTL
    • Elsevier

    A new salt-inclusion chalcogenide exhibiting distinctive [Cd11In9S26]3? host framework and decent nonlinear optical performances

    Pei S.-M.Jiang L.-T.Liu B.-W.Guo G.-C....
    6页
    查看更多>>摘要：Salt-inclusion chalcogenide is a promising infrared (IR) nonlinear optical (NLO) system for its potential in mitigating the incompatibility between second harmonic generation (SHG) efficiency and laser-induced damage threshold (LIDT). Herein, a new noncentrosymmetric salt-inclusion chalcogenide, [Rb4Cl][Cd11In9S26] (1), was prepared by high-temperature solid-state method. It features a distinctive [Cd11In9S26]3- host framework composing of pseudo-T2-Cd3InS10 and T2-CdIn3S10 supertetrahedra, which are rare in known salt-inclusion chalcogenides. Remarkably, compound 1 exhibits a phase-matchable SHG signal (0.23 times that of benchmark AgGaS2), which mainly originates from the distorted CdS4 and InS4 tetrahedra in the host moiety. Moreover, it possesses moderate band gap (2.32 eV) and high LIDT (4.9 ×AgGaS2). Such high LIDT may due to its small thermal expansion anisotropy.
      原文链接:
    • NSTL
    • Elsevier

    All-in-One flexible supercapacitor based on hydrogen bonds cross-linked organic gel electrolyte with anti-freezing and anti-pressure properties

    Wang D.Liu F.Wang Z.Wang X....
    9页
    查看更多>>摘要：Hydrogel electrolytes have gained significant attention in the field of flexible supercapacitors (SCs) for their intrinsic safety, high flexibility, and superior ionic conductivity. However, the water-rich structures of traditional hydrogel electrolytes inevitably cause them to freeze at subfreezing temperatures, which limits the application of flexible supercapacitors at extremely cold temperatures. Here, a compressible and low-temperature resistant supercapacitor is fabricated containing multiple hydrogen bonds cross-linked N-(2-Hydroxyethyl) acrylamide (NHEA), acrylic acid (AA), ethylene glycol/water (EG/H2O), and H2SO4 organic gel electrolyte (OGE). The fabricated OGE exhibits high compressive stress (200 kPa), excellent shape recovery property, and high proton conductivity (62 mS/cm) even at ?40 °C. Meanwhile, a reasonable assembly method of All-in-One SCs greatly reduces the contact resistance between the electrode and the gel electrolyte, progressing great capacitance (114 F/g) and flexibility. Remarkably, the device retains high capacitance retention under strong compressive stress (nearly 100%) and long-term circle (90.73% capacitance retention rate after 10,000 cycles). Furthermore, it retains near 76% capacitance at ?40 °C, demonstrating the potential for applications in cold climates and high-altitude regions.
      原文链接:
    • NSTL
    • Elsevier

    Novel one-pot sol-gel synthesis route of Fe3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix

    Gonzalez C.Marin P.Granados-Miralles C.Varela M....
    8页
    查看更多>>摘要：Fe3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix are synthesized by a novel two-step surfactant sol-gel strategy, where the processes of hydrolysis, polycondensation and drying take place in a one-pot. The present approach is based on the combined action of oleic acid and oleylamine, which act sterically on the precursor micelles when a densification temperature is performed in a reducing atmosphere. The structural and magnetic evolution of the formed compounds is investigated, ranging from iron oxides such as Fe3O4 and FeO, to the formation of pure Fe3C/C samples from 700 oC onwards. Interestingly, Fe3C nanoparticles with a size of ~20 nm crystallize immersed in the carbon matrix and the surrounding environment forms an oriented encapsulation built by few-layered graphene. The nanostructures show a saturation magnetization of ~43 emu/g and a moderate coercivity of ~500 Oe. Thereby, an innovative chemical route to produce single phase Fe3C nanoparticles is described, and an effective method of few-layered graphene passivation is proposed, yielding a product with a high magnetic response and high chemical stability against environmental corrosion.
      原文链接:
    • NSTL
    • Elsevier

    Scalable synthesis of high-performance anode material SiOx/C for lithium-ion batteries by employing the Rochow reaction process

    Gao X.Zhao D.Xu G.Li Q....
    10页
    查看更多>>摘要：The commercial application of silicon oxide (SiOx)-based anode materials in lithium-ion batteries (LIBs) is hindered by their poor electrochemical performance and difficulty in large-scale production. Here, we report a scalable synthesis of a carbon-coated SiOx composite (SiOx/C) as an excellent and stable anode material for LIBs. By employing the industrial Rochow reaction process, metallurgic grade Si microparticles first reacted with gaseous CH3OH over a Cu-based catalyst to generate alkoxysilanes (important organosilane monomers) and SiOx particles covered with organic compounds. After separation and washing, the obtained SiOx solid particles were carbonized to generate the SiOx/C composite. The prepared SiOx/C composite used as the anode material in LIBs could deliver a high reversible capacity of 581 mAh g?1 at a higher current density of 100 mA g?1 after 100 cycles and 510 mAh g?1 after 250 cycles even at a higher current density of 500 mA g?1. It is anticipated that by employing an industrial process for alkoxysilane synthesis with controlled reaction conditions, the large-scale preparation of a SiOx/C anode material becomes highly feasible.
      原文链接:
    • NSTL

    Trimetallic nanoplate arrays of Ni-Fe-Mo sulfide on FeNi3 foam: A highly efficient and bifunctional electrocatalyst for overall water splitting

    Shen J.Zhang X.Liu Z.Liu J....
    11页
    查看更多>>摘要：One of the challenges to realize large-scale water splitting is the lack of highly active and low-cost electrocatalysts for its two half reactions: hydrogen and oxygen evolution reactions (HER and OER). In this work, a Mo doping approach is adopted to enhance the HER and OER bifunctionality of NiFe-LDH. The catalyst MoNiFeSx@FeNi3 obtained after sulfidation exhibits further improved catalytic performance and good stability. In KOH solution (1.0 M), ultralow overpotentials of 67 mV and 142 mV work well to reach current densities of 10 mA cm?2 for HER and OER, separately. In urea (0.33 M) and KOH (1.0 M) solutions, catalyst urea oxidation reaction can be significantly promoted by MoNiFeSx@FeNi3, and can reach a current density of 10 mA cm?2 under the condition of 1.31 V. Most importantly, our work elaborates a facile strategy to synthesize novel trimetallic transition metal catalyst as a cut-price substitute for precious metals for highly effective overall water splitting.
      原文链接:
    • NSTL
    • Elsevier

    One-pot synthesis of C-modified and N-doped TiO2 for enhanced visible-light photocatalytic activity

    Zhu G.Liu Y.Zeng Y.Wang T....
    13页
    查看更多>>摘要：Brand-new catalyst of C-modified and N-doped TiO2 (T3FN1) were synthesized by the hydro-thermal method using Tetrabutyl titanate (TBOT) and feathers of chicken as the precursor. It was found that thanks to the abundant TiO2 nanoparticles (anatase phase) distribution around the outer surface of feathers template, the catalyst displayed a typical 3D surface folded rod-shaped micron structure. After 30 min visible-light illumination, the degradation rate of TCH reached 89.8% with T3FN1, 1.52 times and 2.62 times higher than that of TiO2 without template (T3) and P25, respectively. Mechanism studies revealed that chicken feathers were used as natural organic templates to increase the dispersity of TiO2 meanwhile nitrogen in it was directly doped into TiO2 to improve the catalysts’ response to visible light. Beyond that, carbon of chicken feathers can be utilized directly as the transmission medium for electric charges to improve the spatial separation of photo-induced carriers. Moreover, with a wide pH range of adaptability and stability, the degradation rate of TCH by T3FN1 can still reach 83.15% after 5 cycles. Given its unique structure and photocatalytic performance, the catalyst has great potential in practical wastewater treatment.
      原文链接:
    • NSTL
    • Elsevier