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Enrico Bellandi Angelo Claudio Nale Massimo Caniatti 《Microelectronic Engineering》2008,85(12):2406-2410
The physical and structural evolution of alumina films deposited by ALCVD annealed at high temperatures in N2 has been studied.Low temperature post deposition treatments in NH3 (PDN) have been performed to evaluate the impact of nitrogen incorporation in the alumina film on its thermal stability. Thermal evolution has been studied by deep UV spectroscopic ellipsometry and grazing X-ray reflectance techniques. AFM measurements were also performed to confirm and complete the ellipsometric and GXR analysis.The change of the crystalline structure was detected by ellipsometry by the different UV refractive index, while the GXR provided a unique thickness evaluation.It was therefore possible to determine the layer densification after the thermal treatment and the impact of the PDN on the transition temperature. 相似文献
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Didier Blanchard Angeloclaudio Nale Dadi Sveinbjörnsson Tamara M. Eggenhuisen Margriet H. W. Verkuijlen Suwarno Tejs Vegge Arno P. M. Kentgens Petra E. de Jongh 《Advanced functional materials》2015,25(2):184-192
Designing new functional materials is crucial for the development of efficient energy storage and conversion devices such as all solid‐state batteries. LiBH4 is a promising solid electrolyte for Li‐ion batteries. It displays high lithium mobility, although only above 110 °C at which a transition to a high temperature hexagonal structure occurs. Herein, it is shown that confining LiBH4 in the pores of ordered mesoporous silica scaffolds leads to high Li+ conductivity (0.1 mS cm?1) at room temperature. This is a surprisingly high value, especially given that the nanocomposites comprise 42 vol% of SiO2. Solid state 7Li NMR confirmed that the high conductivity can be attributed to a very high Li+ mobility in the solid phase at room temperature. Confinement of LiBH4 in the pores leads also to a lower solid‐solid phase transition temperature than for bulk LiBH4. However, the high ionic mobility is associated with a fraction of the confined borohydride that shows no phase transition, and most likely located close to the interface with the SiO2 pore walls. These results point to a new strategy to design low‐temperature ion conducting solids for application in all solid‐state lithium ion batteries, which could enable safe use of Li‐metal anodes. 相似文献
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Marcos Yutaka Shiino Francis Mariana Gonzlez Ramírez Felipe Parise Garpelli Núbia Nale Alves da Silveira Rita de Cssia Mendona Sales Maurício Vicente Donadon 《Fatigue & Fracture of Engineering Materials & Structures》2019,42(3):752-763
Composite joints exhibit different behavior in regard to delamination resistance when dealing with fatigue phenomenon. This research work focuses on an investigation to understand the failure mechanisms on the interfacial strength domain for delamination onset in cocured and cobonded joints. The analysis was based on strain energy release rate versus number of cycles plots that were obtained from fatigue tests in mode I with a stress ratio R = 0.1. The analysis encompassed from the microscopic to mesoscopic level obtained from scanning electron microscopic, and the images processed to extract the most relevant fracture patterns. The main difference between the two technologies was the stress concentration at the crack tip in which the cobonded joint presents a fabric carrier that blunts the adhesive layer, then delaying the delamination. This paper provides important information and guidelines to aid designers in the selection of the best composite joint for high‐performance structural applications. 相似文献
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Angeloclaudio Nale Michele Catti Elisa Gil Bardají Maximilian Fichtner 《International Journal of Hydrogen Energy》2011,36(21):13676-13682
The dehydrogenation reaction of the 0.6LiBH4-0.4Mg(BH4)2 eutectic system was investigated by Temperature-Programmed-Desorption and Pressure-Composition-Isotherm methods, in the range of 25–540 °C and 0.1–150 bar of p(H2). A sequence of four decomposition steps was found by TPD measurements; they occur at 235, 315, 365 and 460 °C for p(H2) = 3 bar, with a clear T decrease with respect to pure LiBH4 and Mg(BH4)2. In the PCI experiments, the first two steps could not be resolved but appeared merged in a single process. The amounts of H2 release at each step and the ΔrH and ΔrS values derived from van’t Hoff plots were analyzed and compared with known results for relevant possible reactions. A scheme of interpretation was then proposed for all four processes. In particular, a fraction of LiBH4 and Mg(BH4)2 would react together in the range of 300–350 °C according to 2LiBH4 + Mg(BH4)2 → 2B + 2LiH + MgB2 + 7H2, thus explaining the quite large H2 yield therein observed. The first and fourth steps correspond to decompositions of pure remaining Mg(BH4)2 and LiBH4, respectively, and the third one to dehydrogenation of MgH2 produced in the first step. 相似文献
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