Institutional Repository of Ningbo Institute of Material Technology & Engineering, CAS

    Magnetocaloric effect in NaZn13-type La(1-)PrxFe(11.44)Si(1.56) melt-spun ribbons

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    The influence of Pr content on structure, magnetic properties, and magnetic entropy changes of La1-xPrxFe11.44Si1.56 was investigated. X-ray diffraction analysis showed that the 1: 13 phase with cubic NaZn13-type structure was obtained by a short time annealing (1300 K and 3 h) in melt-spun ribbons, which in contrast requires much longer time annealing at high temperature to develop in the bulk alloy. The field-induced first-order transition was observed in the as-annealed ribbons, leading to the large magnetic entropy changes. The maximum magnetic entropy changes under a magnetic field of 5 T were about 14.3, 19.2, and 19 J/kg K for the ribbons with x=0, 0.1, and 0.2, respectively. (C) 2010 American Institute of Physics

    含氮杂环的新型聚酰亚胺的合成

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    Enhancement of Glass-forming Ability of CoFeBSiNb Bulk Glassy Alloy with Good Soft-magnetic Properties

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    The effect of B and Si concentration ratio on the glass-forming ability (GFA) of Co46Fe20B22+xSi6-xNb6 (x=0–2) glassy alloys was investigated. By copper mold casting, bulk glassy alloys of Co46Fe20B22+xSi6-xNb6 with diameters up to 4.5 mm were synthesized in the compositions of x=1. The additions of 23at% B combined with 5at% Si was found to be effective for the extension of the supercooled liquid region (∆Tx) defined by the difference between glass transition temperature (Tg) and crystallization temperature (Tx). The ∆Tx value is 51 K for the Co46Fe20B22Si6Nb6 alloy, and increases to 55 K for the Co46Fe20B23Si5Nb6 glassy alloy. In addition, this glassy alloy exhibits a highly reduced glass transition temperature (Tg/Tl) of 0.64 and in the compositions of x=1 was found to be in approaching alloy to a eutectic point. Large ∆Tx, high Tg/Tl and in approaching alloy to a eutectic point enabled us to prepare the Co46Fe20B23Si5Nb6 bulk glassy alloy successfully with a diameter of 4.5 mm. In addition to high glass-forming ability, the bulk glassy alloys exhibit excellent soft-magnetic properties, i.e., high saturation magnetization of 0.63–0.69 T, low coercive force of 1.17–2.35A/m, high effective permeability at 1 kHz of 1.36–2.65×104. The mechanisms for the high glass-forming ability and excellent soft-magnetic properties of the Co44Fe20B22+xSi6-xNb6 (x=0–2) glassy alloys are discussed

    一种充磁装置

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    Microstructure and anti- wear and corrosion performances of novel UHMWPE/graphene-nanosheet composite coatings deposited by flame spraying

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    Ultra-high molecular weight polyethylene (UHMWPE)/graphene-nanosheet (GN, multiple layers of graphene sheets with the thickness of ~5–10?nm) coatings have been deposited by flame spraying. The structure of UHMWPE remained almost intact after the spray processing and addition of GNs resulted in a slightly decreased crystallinity and improved thermal stability of UHMWPE. In addition, the coating containing 1.0?wt.% GNs exhibited a reduction of ~20% in wear rate and 25% in friction coefficient (0.18 versus 0.24). Significantly enhanced anti-corrosion performances of the UHMWPE–GN coatings were suggested by increased corrosion potential, corrosion current density, and impedance modulus value of the UHMWPE–GN coatings. The very well retained GNs are located mainly at the interfaces between UHMWPE splats and act as bridges connecting the splats, which mainly accounts for the enhanced properties of the composite coatings. The novel UHMWPE–graphene composite coatings show great potential for protecting engineering components for applications against corrosion

    Self-Assembled Dual In-Plane Gate Thin-Film Transistors Gated by Nanogranular SiO2 Proton Conductors for Logic Applications

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    Phosphorus (P)-doped nanogranular SiO2 films are deposited by plasma-enhanced chemical vapor deposition at room temperature, and a high proton conductivity of 5.6 10 4 S cm 1 is measured at room temperature with a relative humidity of 70%. The accumulation of protons at the SiO2/indiumzinc- oxide (IZO) interface induces a large electric-double-layer (EDL) capacitance. Thin-film transistors (TFTs) with two in-plane gates are self-assembled on transparent conducting glass substrates. The large EDL capacitance can effectively modulate the IZO channel with a current ON/OFF ratio of >107. Such TFTs calculate dual input signals at the gate level coupled with a floating gate, analogous to that of neuron MOS (vMOS). AND logic is demonstrated on the neuron TFTs. Such neuron TFTs gated by P-doped nanogranular SiO2 shows an effective electrostatic modulation on conductivities of oxide semiconductors, which is meaningful for portable chemical-biological sensing applications
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