Papers by Keyword: Layer Structure

Abstract: A coating methods and the structure of Low-E glass are described in this paper, and the optical and thermal properties of the samples are analyzed as well. The results show that the Low-E glass has a high transmittance in visible region and with a higher reflectance in middle-infrared band and far-infrared band. It can effectively prevent the heat through the glass. Therefore, Low-E glass can save energy by letting enough sunlight into the room and by impeding the heat through the glass effectively.

Abstract: Amorphous Si/SiO₂ quantum wells have been obtained at room temperature with atomic precision using magnetron sputtering. The Si/SiO₂ layer structure induces the higher optical transmittance at the visible wavelength region with increasing layer numbers. The tentative absorption coefficients are evaluated for integrated Si thicknesses. The absorption edge energy dependency on Si layer thickness E₀ = 1.61 + 0.75d^-2 is in accordance with effective mass theory for thicknesses 0.5 < d < 6nm. Quantum confinement effects of the Si/SiO₂ nanostructure layer are confirmed from optical transmittance and reflectance spectra.

Abstract: M-type Ba-hexaferrite (BaM) thin films with two different structures (single layered and double layered) were deposited on (001) Al₂O₃ substrates by RF magnetron sputtering. The changes in microstructural and magnetic properties of the films corresponding to different layer structures and substrate temperatures (T_s) were investigated. Experimental results indicated that for the single layered films deposited directly on substrates at T_s = 300 °C and T_s = 500 °C, most of the grains are acicular type grains with their c-axis in-plane and/or randomly oriented. However, in the double layered film with first interfacial layer deposited at T_s = 300 °C and second layer deposited at T_s = 500 °C, good crystallographic characteristics and excellent perpendicular c-axis orientation were obtained. The c-axis dispersion angle (Δθ_c) decreased to 0.49^°, while the squareness ratio and coercivity of the out-of-plane respectively increased to 0.85 and 4.67 kOe in the double layered film. The mechanism for improving perpendicular c-axis orientation with the interfacial BaM layer was attributed to an increase in the perpendicularly oriented nucleation sites and the release of the stress that comes from the film-substrate interface.

Abstract: LiCoO2 is the most studied cathode material for lithium batteries. The doping effect gives a better cycle life in such materials. Apart from the doping effect, the preparation technique also plays an important role. Presently, the layer structured Cu doped LiCoO2 cathode material has been prepared via microwave assisted sol gel route; better cycle life and capacity retention have been attained. It was found that this method could reduce the synthesis time to 30 minutes. The espousal of the microwave method in synthesis could develop a highly efficient, low cost process for synthesis. The surface morphology of the material has been observed using SEM and it is inhomogeneous in nature. The capacity retention is higher than that of pure LiCoO2 material. Compositional analysis was made through EDX. The Cu doped material has a voltage plateau about 4.0V which is obtained from the cyclic voltammetry.

Abstract: In this paper ,the WC and high-Cr Cast Iron layer were obtained on the surface of ZG30Cr steel by casting-penetrating process, the organization and wear properties of penetrating layer were studied.The results show that the layer is dense, without pores, slag and other defects, the penetrating layer and substrate are metallurgical bonding. When 30 %WC and 70 % Cr-Fe with 100～120 mesh are added to permeability agent ,the penetrating layer has the best wear resistance, is 6.8 times the matrix materials. Keywords: The layer structure; Particle size; Wear resistance

Abstract: In this paper, the WC and high-Cr Cast Iron layer were obtained on the surface of ZG30Cr steel by casting-penetrating process, the organization and wear properties of penetrating layer were studied. The results show that the layer is dense, without pores, slag and other defects, the penetrating layer and substrate are metallurgical bonding. When 20 %WC and 80 % Cr-Fe with are added to permeability agent, the penetrating layer has the best wear resistance, is 11.3 times the matrix materials.

Abstract: The dense layered ternary Ti₂AlN ceramics were successfully synthesized by a combination of mechanical alloying and hot press sintering from the mixture of Ti and Al in nitrogen milling atmosphere. The phase transformation and morphology characteristics in mechanical alloying and subsequently hot press sintering were studied by using XRD and SEM as well as EDS. The results show that Ti(Al,N) amorphous powders were synthesized successfully by mechanical alloying. When the as milled powders were hot pressed at 1200 °C for 1 h, full dense and highly pure layered ternary Ti₂AlN ceramic was synthesized.

Abstract: The layer structured niobate Cs4Nb6O17•3H2O has been prepared in a solid state reaction using Cs2CO3 and Nb2O5 at 1073 K. Ion exchange reactions of Cs+ in the interlayer space were studied in aqueous solutions. The single phases of lithium, sodium and hydrogen ion exchange products were obtained and they also contained interlayer water. The interlayer water of the lithium ion exchange product was removed by heating at 453 K in a vacuum. The resulting niobate Cs0.26Li3.01H0.73Nb6O17 was evaluated for its use as the cathode in a rechargeable lithium battery. The cathode exhibited discharge and charge capacities of 120 and 110 mAhg-1 for the first cycle in the voltage range of 1.5 – 4.2 V. The amount of Li+ intercalated and deintercalated were 4.0 and 3.6 of the formula unit, respectively.

Abstract: Sterilization of the NiTi alloy in boiling water or steam causes passivation, which results in an amorphous 3.5 nm thick TiO2 layer on the surface. Between the surface and the matrix a transition layer of Ni2O3 and NiO was observed, using the X-ray photoelectron spectroscopy. Differences in sterilization conditions affect the amount of metallic nickel on the surface.

Abstract: The layer structured titanoniobate CsTiNbO5 has been prepared in a solid state reaction using Cs2CO3, anatase type TiO2 and Nb2O5 at 1073 K. Ion exchange reactions of Cs+ in the interlayer space were studied in aqueous solutions. The host layers of the titanoniobate were maintained on the ion exchange reactions and the resulting products were found to contain interlayer water. The interlayer water in the lithium ion exchange product was removed by heating at 453 K in a vacuum. The resulting titanoniobate Cs0.10Li0.60H0.30TiNbO5 was evaluated for its use as the cathode in a rechargeable lithium battery. The cathode exhibited discharge and charge capacities of 130 and 99 mAhg-1 for the first cycle in the voltage range of 1.5 - 4.2 V. The amounts of Li+ intercalated and deintercalated were 1.16 and 0.88 of the formula unit, respectively.