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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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    Soft magnetic performance of ultra-rapidly annealed high-Bs Fe-(Co)-B nanocrystalline alloys at elevated temperatures

    Kunca B.Marcin J.Skorvanek I.Parsons R....
    7页
    查看更多>>摘要：? 2022 Elsevier B.V.Ultra – rapid annealing (URA) utilizing pair of pre-heated massive Cu blocks has been recently shown to be a useful tool to obtain Fe-(Co)-B based nanocrystalline alloys with reduced metalloid content exhibiting an attractive combination of low coercivity (Hc) and high saturation magnetic induction (Bs) values. However, current knowledge lacks more data about behavior of these alloys at elevated temperatures. In this study we investigate high-temperature performance of the URA annealed (Fe1?xCox)87B13 (x = 0, 0.2, 0.25) nanocrystalline alloys. After annealing for 0.5 s at 763 K, the room temperature coercivities between 6.6 A/m (x = 0) to 10.8 A/m (x = 0.25) and Bs values (measured at 8 kA/m) ranging from 1.87 T (x = 0) to 2.01 T (x = 0.2) were attained. The temperature dependence of coercivity was determined from the hysteresis loops measured between room temperature and 573 K. Our experiments revealed that the coercivity of all three alloys firstly decreases with an increase of measuring temperature up to 523 K and then increases. A gradual decrease of the coercivity for T < 523 K was more significant for Fe87B13 alloy, while the abrupt magnetic hardening at 573 K was more significant in the case of Co-containing samples. Possible mechanisms behind the observed high-temperature soft magnetic performance of the studied alloys are discussed.
      原文链接:
    • NSTL
    • Elsevier

    The Os substitution into Fe sites in LuFeO3 multiferroic and its effects on the electrical and dielectric features

    Polat O.Roupcova P.Sikola T.Coskun M....
    14页
    查看更多>>摘要：? 2022 Elsevier B.V.Solid-state technique was utilized to obtain the LuFeO3 (LFO) and LuFe1?xOsxO3 (LFOO) compounds having x = 0.05 and 0.10. The orthorhombic structure and the presence of secondary phases in the studied samples have been unveiled by X-ray diffractometer (XRD) investigations. The scanning electron microscope (SEM) examinations have unveiled that not only the particle sizes enlarge with Os substitution but also particle agglomeration takes place. The X-ray photoelectron spectroscopy (XPS) investigations have exposed the oxidations of Fe as 2 + and 3 + for the LFO sample, 3 + for 5 mol% Os substituted specimen and mix of 2 + and 3 + for 10 mol% Os doped sample. In addition, it was shown that Os has 4 + oxidation state in the doped samples. Dielectrical and electrical conductivity studies of the obtained ceramics conducted between ? 100 °C (173 K) up to 100 °C (373 K) with 20 °C temperature pace have shown that the undoped sample has much higher values than the Os doped samples. Such differences have been ascribed to the absence of Fe2+ ions and lattice distortions in the Os doped samples. In addition, it was realized that different conduction models need to be adapted to comprehend the conduction mechanism in the examined specimens.
      原文链接:
    • NSTL
    • Elsevier

    Tuning of magnetic properties in Cr-doped lithium ferrite

    Mali B.Elizabeth S.Ashok K.Sreemoolanadhan H....
    10页
    查看更多>>摘要：? 2022 Elsevier B.V.Cationic substitutions in lithium ferrite spinel (LiFe5O8) leading to modifications in magnetic properties have a significant role in their technological applications. In this context, LiFe5?xCrxO8, compounds with 0 ≤ x ≤ 3 were synthesized and studied using X-ray diffraction, X-ray photoelectron spectroscopy (XPS), Mo¨ssbauer spectroscopy and magnetization measurements. Oxidation states of Fe and Cr are found to be 3 + from XPS investigations and further confirmed from the Mo¨ssbauer analysis. Cr replaces Fe from both tetrahedral and octahedral sites. Magnetization and magnetic ordering temperature decrease with increasing Cr concentration. This is consequent to reduced strength of dominant Fe - O - Fe interactions due to replacement of Fe with Cr cation possessing relatively smaller magnetic moment. The positive value of Curie-Weiss constant implies that the system has dominant ferromagnetic interactions. The much important negative magnetization and spin compensation phenomena are observed only in specific range of doping concentration (x = 2.5–3). Spin compensation in LiFe2.5Cr2.5O8 occurs at 315 K, close to room temperature.
      原文链接:
    • NSTL
    • Elsevier

    T- and T′-type layered perovskite Ln2CuO4 nanocrystals for enhanced sensing detection of hydrogen peroxide

    Wang X.-T.Kong D.-R.Zhang X.-F.Deng Z.-P....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.Nanostructured rare earth cuprates have recently attracted extensive attention as a promising non-noble metal electrocatalyst. However, they are rarely used to construct electrochemical sensors, even no report on hydrogen peroxide detection. Accordingly, two types of layered perovskite Ln2CuO4 nanocrystals with different structures, i.e., T-La2CuO4 and T′-Sm2CuO4 were synthesized from sol-gel method followed by calcining at 600 ℃ in air. Then, these nanomaterials were separately modified on the surface of bare glassy carbon electrode (GCE) by drop coating method, thus assembling efficient non-enzymatic H2O2 electrochemical sensor for the first time. In phosphate buffer solution (pH = 7.0), the La2CuO4/GCE shows high sensitivity (419.6 μA mM?1 cm?2) and low detection limit (160 nM) towards H2O2, which are significantly superior to those of Sm2CuO4/GCE. The difference in electrochemical sensing performance is mainly related to their electrode surface area and conductivity, characteristics of T- and T′-type layered structures, as well as the synergism of interstitial oxygen content and Cu2+/Cu+ redox coupling. In addition, La2CuO4/GCE has satisfactory selectivity and stability, and achieves the detection of trace H2O2 in rat serum, contact lens cleaning solution, tap water and disinfectant, indicating that it has certain practical applications in environmental protection and biological analysis.
      原文链接:
    • NSTL
    • Elsevier

    Mechanical property and microstructure of in-situ TiB/Ti composites via vacuum sintering and hot rolling

    Zhou Y.Yang F.Chen C.Shao Y....
    14页
    查看更多>>摘要：? 2022 Elsevier B.V.High-plasticity in-situ TiB/Ti matrix composites (TMCs) are fabricated by in-situ reaction between Ti and ZrB2 powder during vacuum sintering followed by hot rolling. Uniform microstructure is observed in the TMCs with obvious grain refinement. Compared with pure titanium, the mean grain size of Ti-2.0 wt% ZrB2 composite significantly decreases from 50.7 μm to 17.5 μm, decreasing by 65%. Accordingly, Ti-2.0 ZrB2 composite displays outstanding mechanical properties of 734.6 MPa in ultimate tensile strength, 579.0 MPa in yield strength, 21.4% in elongation, while these values of pure Ti are 632.4 MPa, 507.0 MPa, and 14.2%, respectively. The strength improvement of TMCs can be mainly attributed to five parts: grain refinement, solid solution strengthening, load transfer mechanism, CTE mismatch between TiB and Ti matrix and the dislocation substructure hardening. Among them, dislocation substructure hardening (more than 50% of the total improvement) takes the dominant position in strength increment in the as-rolled TiB/Ti matrix composites.
      原文链接:
    • NSTL
    • Elsevier

    Effect of element V on the as-cast microstructure and mechanical properties of Al0.4Co0.5VxFeNi high entropy alloys

    Li Y.Yang Z.Ma Z.Bai Y....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.The as-cast microstructure characteristic and room temperature mechanical properties of Al0.4Co0.5VxFeNi high-entropy alloys (HEAs, where x = 0, 0.2, 0.4, and 0.6 in molar ratio, denoted as AC0, AC1, AC2, and AC3, respectively), fabricated by the vacuum arc melting method, were investigated by a combination of optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and tension and compression tests. The vertical section of phase diagrams of Al0.4Co0.5VxFeNi HEAs were calculated with the Pandat software to show the equilibrium phases in the alloys at varying temperatures. The results show that Al0.4Co0.5VxFeNi HEAs have dual-phase structures. AC0, AC1, and AC2 show a typical dendritic structure composed of dendritic and interdendritic phases. AC3 shows a typical dual-phase structure with the characteristics of a eutectic structure. The comprehensive performance of the Al0.4Co0.5VxFeNi HEAs is remarkably enhanced by vanadium alloying. AC0 has a microhardness of about 2.79–2.90 GPa, which is three times lower than that of AC3. With an increase of V from 0.4 to 0.6, the structure of FCC-L12 transforms into an FCC phase. The AC1and AC2 HEAs present excellent strength and ductility, with elongation of tension tests at break exceeding 30%. Compared to the tension strength of AC1 and AC2, the yield strength of AC3 increases distinctly and its ultimate strength of extension increases, which is in trade off elongation. The fractured surfaces of AC1 and AC2 are ductile fractures, but the fracture surface feature of AC3 is mainly trench-like microstructures. During tensile deformation, the FCC phase is stretched by ductile fracturing while the BCC-B2 phase shows barely deformed cleavage fracturing, which causes the FCC phase to become thinner and with protruding edges.
      原文链接:
    • NSTL
    • Elsevier

    Mechanism of metal sulfides accelerating the REDOX cycle of Fe(II)/Fe(III) and promoting the degradation of As(III) by oxalate

    Peng Y.Yan Y.Wang J.Xiao H....
    12页
    查看更多>>摘要：? 2022In this study, a matrix composite material of CdZnS and α-FeOOH on carbon cloth (CZS@FeOOH@CC) was prepared by a hydrothermal method, and was used for the degradation of As(III). The composite material has good photocatalytic activity of removing As(III) in the presence of oxalate. CZS@FeOOH@CC can completely degrade 10 mg/L As(III) within 10 min under visible light irradiation. The influence factors of CZS@FeOOH@CC composite material on catalytic oxidation of As(III) were also studied in the oxalate system. The photocatalytic oxidation efficiency of As(III) is affected by the oxalate concentration in the reaction system, and the atmosphere plays a major role in the degradation of As(III). Under visible light, oxalate first combines with Fe(III) on the surface of iron oxide to form Fe(III)-oxalate complex, and then the Fe(III)-oxalate composite is activated to produce·C2O4?. In the presence of oxygen, Fe(II) readily reacts with O2 and oxidizes to Fe(III). The introduction of CdZnS promoted the separation of interfacial electron holes, and accelerated the REDOX cycle of Fe(II)/Fe(III). This study provides a feasible and simple method for accelerating the catalytic removal of heavy metals from wastewater by iron-based materials.
      原文链接:
    • NSTL
    • Elsevier

    Anisotropy investigation of an ECAP-processed Mg-Al-Ca-Mn alloy with synergistically enhanced mechanical properties and corrosion resistance

    Bai J.Xue F.Xin Y.Sun C....
    15页
    查看更多>>摘要：? 2022 Elsevier B.V.Anisotropy of a 32-pass equal channel angular pressing (ECAP) processed Mg-3.7Al-1.8Ca-0.4Mn (wt%) alloy with synergistically enhanced mechanical properties and corrosion resistance was investigated. Compared with coarse α-Mg grains and discontinuous network Al2Ca phase in as-cast alloy, the ECAP alloy exhibits homogeneous fine α-Mg grains (~2.6 μm), but refined Al2Ca particles show different distribution in three planes, which is network in the extrusion plane (EP), uniform in normal plane (NP) and bandlike in transverse plane (TP). Refinement of microstructure after ECAP resulted in the synergistically enhanced mechanical and corrosion performances in three planes (directions). Moreover, due to grain refinement, the protective film was easily produced on the ECAP alloy, resulting in different corrosion mechanisms developed between ECAP and as-cast alloys. The main factors effecting anisotropic properties of ECAP alloy are Al2Ca distribution and texture of α-Mg. Based on the anisotropy investigations, grain size in several microns and high (0001) basal texture density are necessary to realize RE-free Mg-Al-Ca-Mn alloys with synergetic high strength and good corrosion performance.
      原文链接:
    • NSTL
    • Elsevier

    A novel g-C3N4/In2O3/BiVO4 heterojunction photoanode for improved the photoelectrochemical cathodic protection of 304 SS stainless steel under solar light

    Helal A.Eid A.I.El-Sheikh S.M.Jianqiang Y....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.Recently, photocathodic protection has been regarded as one of the environment-friendly techniques for metal's anti-corrosion. In this technique, n-type semiconductor photoanode produces photogenerated electrons to reparation the lost electrons from metals. Therefore, significant efforts have been made to develop materials with facile methods for improving metals photocathodic protection. Herein, g-C3N4/In2O3/BiVO4 trinary system composite was synthesized through a novel approach. The XRD, UV, and PL techniques were used to confirm the enhancement in photogenerated electrons. Furthermore, the photoelectrochemical results showed that the prepared samples increased the negativity of the 304 SS stainless steel under open circuit potential (OCP) conditions. Additionally, the potential of the 304 SS polarization showed a negative shift from ? 505 to ? 625 mV and ? 635 mV after joined to In2O3/BiVO4 and C3N4/In2O3/BiVO4, respectively. Moreover, the presence of g-C3N4 was provided extra cathodic protection, providing polarization potential more negative during light off. That expects the insertion of this material into the offshore facilities coating to increase its lifetime and decrease corroded metals' discharge into the water bodies.
      原文链接:
    • NSTL
    • Elsevier

    Hydrothermally synthesized spherical g-C3N4-NiCo2O4 nanocomposites for ppb level ethanol detection

    Akhtar A.Liu J.Wang Y.Wei H....
    11页
    查看更多>>摘要：? 2022 Elsevier B.V.Gas-sensing materials that can detect ethanol concentration at ppb level have attracted widespread attention. Unique nanostructures assisted by novel nanocomposites are promising candidates for gas sensor applications. Herein, spherical NiCo2O4 decorated onto the g-C3N4 layered structure has been synthesized via hydrothermal method, which has been devoted actually to detect volatile and hazardous vapors. The structures and physical properties of synthesized nanocomposites were confirmed by various techniques such as XRD, SEM, TEM, HRTEM, SAED, FTIR, Raman, XPS and BET methods. A series of sensors were fabricated from the synthesized composites to detect ethanol vapors to a minimum concentration. Meanwhile, the sensor of 6 wt% g-C3N4-NiCo2O4 (NCO-6) obtained an effective response, good selectivity, short response/recovery time, valuable stability and reproducibility to 100 ppm ethanol. Additionally, the limit of detection was 10 ppb ethanol, to which the response of 1.92 was obtained. Compared with the response of 2.1–100 ppm ethanol from NCO-0 sensor, the NCO-6 sensor exhibited a response of 19.2 at the same condition. The improvement of response was discussed in several aspects, such as layered g-C3N4 structures, the increased BET specific surface area and the increase of oxygen species adsorbed on the surface of the composites. The present study proposes the nanocomposites with layered g-C3N4 and spherical NiCo2O4, which are potential gas-sensing materials with promising applicability because of the linear relation between response and ethanol concentration.
      原文链接:
    • NSTL
    • Elsevier