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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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    (162953)Ternary relation among stacking fault energy, grain size and twin nucleation size in nanocrystalline and ultrafine grained CuAl alloys

    Shaojia ShiLiangjuan DaiYonghao Zhao
    9页
    查看更多>>摘要:The stacking fault energy y of an alloy has been reported to significantly affect the grain size d and twin nucleation size r_c during grain refinement. However, ternary relation among y, d and r_c has not been investigated comprehensively. Here we prepared nanocrystalline (NC) and ultrafine-grained (UFG) 99.99 wt% Cu, Cu-0.86 wt% Al and Cu-2.2 wt% Al alloys with different y by high-pressure torsion (HPT), and then characterized d and r_c. Transmission electron microscopy observations show that under the same experimental condition d decreases and corresponding grain refinement mechanism transforms from dislocation subdivision to twin segmentation with decreasing y. The relation among y, d and r_c from experiments are consistent well with theoretical prediction from Meyers model. r_c decreases with decreasing d, and the variation is exacerbated by the decrease of y. r_c increases first and then decreases by forming a peak-shaped variation with decreasing y when d is in UFG regime, suggesting there exists an optimum stacking fault energy r_c for twin nucleation. The r_c peak becomes flat and moves to higher y value when d is in NC regime due to the enhanced geometric effect of d on r_c which weakens the role of y. Our findings reveal a comprehensive ternary relationship among y, d and r_c, and provide guidance for designing NC and UFG materials with high-density twins and good strength-ductility combination.

    (163074)Low temperature magnetic study and first principle calculation in 'Mo' doped CoFe_2O_4 for magnetic information storage applications

    Manish KumarArvind KumarAbhishek Singh
    7页
    查看更多>>摘要:Structural and low temperature magnetic properties of CoFe_(2-x)Mo_xO_4 (x = 0.01,0.03 and 0.05) were studied in the present work. Rietveld refinement of XRD patterns of CoFe_(2-x)Mo_xO_4 (x = 0.01,0.03 and 0.05) confirm the pure phase cubic crystal structure in Fd3m space group. The decrease in lattice parameters (a contraction of the lattice) has been observed with doping, which confirms the probability of substitution of 'Mo' at the octahedral site of parental CoFe_2O_4 (CFO). The micro-strain via W-H plots was found to be enhanced for CoFe_(1.95)Mo_90.05)O_4 (CMF05) sample which confirms the incorporation of 'Mo' atoms at Fe-site and subsequently reducing impurities as observed from refined patterns. The low temperature (2K) magnetic parameters were found to be greatly enhanced with 'Mo' substitution. We observed the decrease in anisotropy constant of Co~(2+) ions with 'Mo' doping and Mo~(6+) ions concentration at the tetrahedral site of CFO, increases the magnetization of the samples. Both M-H and ZFC-FC measurements confirm the ferri-magnetic behavior of all the samples. The maximum value of information storage parameter'S' achieved around 0.442 for x = 0.03 sample at 2K. The structural parameters, electronic (density of states and band structure) and magnetic properties of pure CFO have also been investigated via computational first principle based density functional theory (DFT) calculations. The computational results are in good agreement with the experimental outputs.

    (163063)Formic acid gas sensor based on coreless optical fiber coated by molybdenum disulfide nanosheet

    Fanli MengGaoliang ChenJin Li
    9页
    查看更多>>摘要:Molybdenum disulfide (MoS_2) nanosheets were prepared by the method of liquid phase ultrasonic separation. It is coated on the surface of single mode-no-core-single mode (SNS) fiber structure by drip coating method, which realizes the detection of formic acid gas under room temperature. The corresponding sensing performance has been discussed in the concentration range of 0-250 ppm and 0-1100 ppm, respectively. The good selectivity, repeatability and response/recovery characteristics have been experimentally demonstrated and used for exploring an effect method to greatly improve the sensitivity of the formic acid gas sensor. This passive optical fiber probe has the promising potential application in medical and industrial production process for determining the formic acid concentration at room temperature.

    (162784)Construction of SnS_2@MoS_2@rGO heterojunction anode and their half/ full sodium ion storage performances

    Xianglin YuChangmiao ChenRuixue Li
    10页
    查看更多>>摘要:Transition metal sulfides exhibit great potential in the application of sodium ion battery anode materials because of their unique properties and high theoretical capacity. Nevertheless, their inferior rate and cycling performances impede the commercialization process. Pseudocapacitance is a significant sodium ion storage behavior to enhance reaction kinetics, which is beneficial to the improvement of electrochemical performances. Herein, an anode material possessing heterojunction structure has been constructed through decorating SnS_2 nanoparticles on the surface of MoS_2@rGO (SnS_2@MoS_2@rGO), displaying a high reversible capacity of 237 mAh g~(-1) at 3.2 A g~(-1) and 167 mAh g~(-1) at 6.4 A g~(-1) after 140 cycles. The good electrochemical performances of SnS_2@MoS_2@rGO electrode can be ascribed to the enlarged surface areas and fast sodium ion transport channel resulting from the heterojunction structure. In addition, the sodium ion full cell consists of SnS_2@MoS_2@rGO anode and Na_3V_2(PO_4)_3@C cathode can even exhibit ideal specific capacity (33 mAh g~(-1) at 20 C (1 C = 117 mA g~(-1))), showing potential application prospects.

    (163042)Preparation and characterization of calcium phosphate containing coating on plasma electrolytic oxidized magnesium and its corrosion behavior in simulated body fluids

    Xue ZhangShao-Dong CuiLin Zhou
    15页
    查看更多>>摘要:A double layer coating (Ca-P/PEO) was designed to form on pure magnesium. The Ca-P coatings were prepared at three pH values of the solution. The morphology, phase composition, microstructure, corrosion resistance, and degradation properties of the samples were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and in vitro assessments. The XRD results indicate that the 5.7Ca-P coating is mainly composed of octacalcium phosphate (OCP). The potentiodynamic polarization test indicates that the corrosion current density of the 5.7Ca-P/PEO coated Mg is 100 times and 3 times lower than that of uncoated Mg before and after immersion in SBF solution for 168 h, respectively. The 5.7Ca-P coating promotes the nucleation of osteoconductive minerals (i.e., bone-like apatite), and the hydro-xyapatite (HA) layer formed on the surface of the 5.7Ca-P coating is dense, thick, and stable after immersion in SBF solution for 30 days. These experimental results have demonstrated that the 5.7Ca-P/PEO coating can introduce a high biocompatibility of the bone-Mg substrate interface and provide long-term stable protection in SBF solution in the initial degradation stage.

    (162894)VO_2 nanobelts decorated with a secondary hydrothermal chemical lithiation method for long-life and high-rate Li-ion batteries

    Jianying MengZhengguang ZouXin Liu
    8页
    查看更多>>摘要:In this work, pre-lithiated VO_2(B) nanobelts are synthesized by a two-step hydrothermal method. After pre-lithiation, the VO_2(B) nanobelts exhibit a uniformly dispersed morphology with a large specific surface area. Compared to pure VO_2(B) nanobelts, the pre-lithiated VO_2(B) nanobelts show much better electrochemical performance in terms of cycling stability and high-rate capability. The lithium-ion diffusivity in the pre-lithiated VO_2(B) nanobelts is enhanced due to enlargement of the crystal lattice after pre-lithiation. The pre-lithiated VO_2(B) nanobelt cathode delivers an initial specific capacity of 264 mA h g~(-1 at 0.1 A g~(-1 with a capacity retention of 81.6% after 100 cycles, which is superior to that obtained for pure VO_2(B) under the same conditions (initial capacity of 221.5 mA h g~(-1 and capacity retention of 63.3%). Moreover, the pre-lithiated VO_2(B) nanobelt electrode exhibits outstanding long-term cycling stability (capacity retention of 87.2% after 800 cycles at 1000 mA g~(-1)). These results indicate that pre-lithiated VO_2(B) nanobelts have great potential to be applied as an advanced cathode material for next-generation lithium-ion batteries.

    (163040)Dehydroxylation processing and lasing properties of a Nd alumino-phosphate glass

    Monica Munoz-QuinoneroJon AzkargortaIgnacio Iparraguirre
    11页
    查看更多>>摘要:In this work, we have studied the preparation and properties of an alumino-phosphate glass with composition 13Na_2O-13K_2O-16BaO-4Al_2O_3-54P_2O_5 (mol%). The first part of the work deals with the study of the processing conditions of the dehydroxylation of the phosphate glass, which was performed by remelting under N_2 flow using graphite crucibles. Glass samples from 5 to 50 g and Nd_2O_3 doped were submitted to dehydroxylation and the influence of temperature, time, mass of glass and viscosity were correlated with the content of water in the glasses through the coefficient of absorption of OH ions. The network structure of the glasses was also determined by means of ~(31)P and ~(27)A1 1D/2D nuclear magnetic resonance and the local environment of Nd~(3+) ions was probed by electron paramagnetic resonance. The optimized conditions of processing were then used to obtain a dehydroxylated glass with a 2.5 wt% Nd_2O_3 whose spectroscopic and laser emission properties were studied. The spectroscopic properties of Nd~(3+) ions which include, Judd-Ofelt calculation, stimulated emission cross-section of the laser transition, lifetime, and quantum efficiency are presented. Site-selective laser spectroscopy and stimulated emission obtained under selective wavelength pumping along the ~4I_(9/2)→~4F_(5/2) absorption band were performed to determine the distribution of crystal field in which the rare earth is located, together with its influence in the pump wavelength dependence of the spontaneous and laser emissions of Nd~(3+) in this glass matrix.

    (163112)Interfacial engineered PdRu/C with robust poison tolerance for oxygen reduction reaction and zinc-air battery

    Yi ZhangWenxiang ZhuFan Liao
    8页
    查看更多>>摘要:Developing a highly efficient and robust poison tolerance catalyst for oxygen reduction reaction (ORR) is significantly critical for sustainable energy convert systems. Herein, an interfacial engineered PdRu/C is prepared by reduction of silicon-hydrogen bonds. The interface between Pd and Ru is beneficial for exposing the active site, enhancing charge transfer and adjusting the adsorption energy barrier, resulting in the excellent ORR performances. Compared with commercial Pt/C (0.84 V) and commercial Pd/C (0.84 V), the optimal Pd_9Ru_1/C demonstrates high electrocatalytic activity with half-wave potential up of 0.86 V in 0.1 M KOH solution. Meanwhile, the experimental results indicate that bimetallic interface engineering can greatly enhance toxicity resistance to various poisons, including CO, methanol, NO_x, SO_x and PO_x. When they are applied to zinc-air battery as an air cathode, the battery exhibits an open circuit voltage of 1.48 V. Interestingly, the power density reaches up to 240 mW cm~(-2), which is superior to those of commercial Pt/C (219 mW cm~(-2)) and commercial Pd/C (128 mW cm~(-2)). This work opens up an effective strategy to conceive interfacial hybrid for electrocatalysis.

    (163140)Photodeposition of alloyed Au-Pt nanoparticles on TiO_2 for the enhanced catalytic oxidation of HCHO at room temperature

    Yuanbo SongHongyun DuHaocheng Wu
    12页
    查看更多>>摘要:Catalytic oxidation has been considered as one of the most promising strategies for the removal of indoor HCHO which causes multiple health problems. Alloyed Au-Pt showed potential for catalytic oxidation reactions, but the reports on HCHO oxidation are limited. In addition.understanding on the catalytic mechanism is lacking. In this work, a sodium citrate assistant photodeposition process was developed to fabricate highly dispersed dual Au-Pt alloy with 2-3 nm on the surface of TiO_2. The turnover frequency of Au-Pt/TiO_2 (68.6 h~(-1)) is much higher than that of Pt/TiO_2 (19.9 h~(-1)). This enhancement was also confirmed on different TiO_2 supports and with different Pt loading. Based on the experimental and density functional theory calculations, it was found that the alloyed Au-Pt has more metallic Pt and is beneficial for the adsorption and dissociation of oxygen. Therefore, the rapid conversion of dioxymethylene species to formate species, with reduced reaction barrier, promotes the performance in catalytic oxidation of HCHO.

    (162921)NH_4Sb_2(C_2O_4)F_5: A novel UV nonlinear optical material synthesized in deep eutectic solvents

    Die ZhangQiang WangTing Zheng
    6页
    查看更多>>摘要:The deep eutectic solvents was first employed to solve the hydrolysis of Sb~(3+) cations in Sb(III)-oxyacid system to explore new nonlinear optical materials, producing a novel antimony(III) fluoride oxalate named NH_4Sb_2(C_2O_4)F_5. The title compound featured a 3D noncentrosymmetric structure composed of [Sb_2(C_2O_4) F_5]~- anionic clusters and NH~4~+ cations. The cooperative effect of the planar n-conjugated [C_2O_4]~(2-) anionic groups and the Sb~(3+) cations with stereochemicaly active lone pairs induce a relatively strong SHG response (l.l×KH_2PO_4) and a large birefringence (0.111@546nm), which was confirmed by detailed theoretical calculations. The overall performances indicate that NH_4Sb_2(C_2O_4)F_5 is a potential ultraviolet nonlinear optical material. The successful application of deep eutectic solvents in the synthesis for easy hydrolytic materials system opens the door to exploring new inorganic solid functional materials.